MORGAM Manual

Data Transfer Format: Additional Baseline Data Form: 21 Version: 4 Date: 05.05.2004

© National Institute for Health and Welfare and the MORGAM Project investigators Last updated: 9 January 2009 For more information, please contact Kari Kuulasmaa (firstname.lastname@thl.fi)

The purpose of this transfer format is to provide an exact and common format for the MORGAM Participating Centres (MPCs) to transfer baseline data, additional to those included in the MONICA survey data record, to the MORGAM Data Centre (MDC). Data in the format specified here should be submitted to the MDC for every member of each MORGAM cohort. The members of the cohort are defined in section Definition and selection of cohorts. The data should be sent through e-mail, not on paper forms.

Contents

• Format specification
• General instructions
• Specific instructions for each item
• References
• Updates

Format specification

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General Instructions

The record format is ASCII fixed length and record size is 139 characters. The position of each data item in the record is given in column "COLUMNS" of this data transfer format. There should be one record of data for every member of each MORGAM cohort.

This format corresponds with the layout of the information on the electronic data file which is transferred, and need not correspond with the format of locally used paper forms or electronic files. Instructions for transferring the data are given in section Data communication between the Participating Centres and the MDC. To avoid errors, special attention should be paid in extracting these data items from the local data set.

The ITEM NAME on the document is a computer variable name used for the item by the MDC.

Blank fields are not allowed in the record.

Instructions for making corrections to data that have already been sent to the MDC are given in section Data communication between the Participating Centres and the MDC.

Please contact the MDC for instructions if you cannot provide information as specified in this document or if you have any problems with the interpretation of the coding for any specific items.

Most of the items should be extracted from the local baseline questionnaire data. If your baseline questionnaire did not have such questions, but similar information can be extracted from your local data, extract them in such a way that the codes converted from your local data correspond to the codes given here as closely as possible.  Send to the MDC:

• a copy of your original questionnaire,
• an English translation of the relevant questions, and
• the conversion rule between your local question and the codes used here.

Contact the MDC for instructions if you have uncertainty about your conversion.

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Specific instructions for each item

Follow these instructions carefully when creating a computer file for the data transfer from the MPC to the MDC.

Number 21 indicates the "Data transfer format: additional baseline data".

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Enter the version number from the heading of the "Data transfer format: additional baseline data" which you are using. If the version number of the data transfer format which you are using is not "4", these instructions do not correspond to the format you are using. Check that you are using the valid version of the format.

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Items CENTRE...SERIAL

These are key items used for merging the different records of the same individual. Please make sure that the codes are identical with those used for the same person in the "Data transfer format: MONICA survey data".

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Code 88 (irrelevant). The purpose of this item is to reserve fixed columns for the key items in all data transfer formats. This is a key item in the event data formats, but irrelevant for the other data transfer formats.

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The first two columns are for the month; code 01 - 12, or code 99 if the month is not known. Enter the year of birth, in full four characters, in the last four columns. If the year of birth is not known, which should be very rare, derive the year of birth from an estimate of the age.

This item is the same as item MBIRTH of the MONICA Survey Data record, and it will be used for double checking the key items. If you compile the data for this record from various sources, please extract the data for this item from a different source than for the "Data transfer format: MONICA survey data"

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This item is the same as item SEX of the "Data transfer format: MONICA survey data", and it will be used for double checking the key items. If you compile the data for this record from various sources, please extract the data for this item from a different source than for the MONICA survey record.

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Items CTRY...ETHNIC: Ethnic origin

Ethnic origin is an important confounder in genetic relationships. Therefore, if at all possible, it should be identified for the subjects who take part in the genetic substudy. The purpose of these questions is to identify the ethnic origin of the subjects.

The MPC should send the questions from which the data were extracted, or description of other possible source of the data to the MDC.

Country of birth of the subject.

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Country of birth of the subject's parents.

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Code here the subject's ethnic origin.

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Items PREGNA...REMENOP: Pregnancy, parity and reason for stopped monthly periods

These items are intended to complement the data for women which was collected in MONICA. The codes converted from your local data should correspond to the codes given here as closely as possible. In uncertain cases (e.g. if you only have a question "How many children have you got?"), please contact the MDC for instructions.

Code 1 (yes) if the baseline questionnaire included the question 'Have you ever been pregnant?' (or a similar question) and the answer was in the affirmative.
Code 2 (no) if such a question was included in baseline questionnaire and the answer was negative.
Code 9 (insufficient data) if such a question was not included in the baseline questionnaire or if it was included but not answered.

Note: If you did not have a question similar to PREGNA, but you have a question similar to NPREGNA, please derive PREGNA from that.

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Code the number of pregnancies including livebirths, stillbirths and abortions.
Code 88 is used when SEX = 1. Optionally, code 88 can also be used if PREGNA = 2.
Code 99 (insufficient data) if such a question was not included in the baseline questionnaire or if it was included but not answered.

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Enter the number of live births.
Code 88 is used when SEX = 1. Optionally, code 88 can also be used if PREGNA=2.
Code 99 (insufficient data) if such a question was not included in the baseline questionnaire or if it was included but not answered.

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Code 1 if hysterectomy (operation to remove the womb) stopped the monthly periods, but at least one ovary was left.
Code 2 if hysterectomy stopped the monthly periods, but it is unknown whether or not both ovaries were removed.
Code 3 if bilateral oophorectomy with or without hysterectomy stopped the monthly periods.
Code 4 if periods stopped in the usual way because the person reached menopause.
Code 8 if item MENOP in the Data transfer format - MONICA survey data was coded 1, 2 or 8.
Code 9 if insufficient information is available to use another code.

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Items EMPLOY...WKSET: Employment and occupation

Code 1, if housewife or homemaker but also having a part-time job.
Code 5, if a full-time student but also doing a part-time job.
Code 9, if the data cannot be extracted from your local data, or if they could be extracted but are not available for this subject.

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This item intends to classify subject's occupation in terms of socio-occupational class or categories.

In some MPCs the information may refer to the current work at the time of the baseline examination. In others it may refer to the work the person has done last or to the work the person has done for most of his life. The MPC should provide such information separately to the MDC. If the item refers to the person's current work, and the person is not working currently (i.e. EMPLOY = 2, 3, 4 or 5), then this item is irrelevant and should be coded 8.

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As for item WKTYPE, in some MPCs the information may refer to the current work at the time of the baseline examination. In others it may refer to the work the person has done last or to the work the person has done for most of his life. The MPC should provide such information separately to the MDC. If the item refers to the person's current work, and the person is not working currently (i.e. EMPLOY = 2, 3, 4 or 5), then this item is irrelevant and should be coded 8.

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Items ALCAVE...ALCPAT: Alcohol consumption

These items are intended to gather information about alcohol consumption. Recommendation is that the codes converted from your local data correspond to the codes given here as closely as possible. The conversion rules between your local questions and the codes used here must be specified and sent to the MDC.

Give the average daily consumption of alcohol in grams. Typically daily consumption of alcohol is estimated from the question(s) concerning a longer period e.g. seven days or the last month. In such cases, divide the consumption during the period by the length of the period e.g. 7 or 30.

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Give here an estimate of the percentage of total alcohol consumption from wine. Count in this category also the alcohol contributed by sherry, Martini, port etc.

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Give here an estimate of the percentage of total alcohol consumption from beer. Count in this category also the alcohol contributed by lager, shandy, cider, stout etc.

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Give here an estimate of the percentage of total alcohol consumption from spirits. Count in this category the alcohol contributed by whisky, vodka, rum, gin etc.

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This item intends to classify subject's usual drinking pattern.

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Items HISMI1...HISMI4: History of myocardial infarction or unstable angina pectoris

The purpose of these items is to indicate the information on previous myocardial infarction or unstable angina pectoris in baseline.

Code 1 (yes) if previous myocardial infarction or unstable angina pectoris was documented in some source of information such as the MONICA coronary event register or other population-based coronary event register, person's medical records, a hospital discharge register or other health information system.
Usually diagnosis of unstable angina pectoris requires hospitalization.
Code 2 (no) if such source was used to assess history of myocardial infarction or unstable angina pectoris, and no such previous event could be detected.
Code 9 (insufficient data) if no such source of information was used or if information of such assessment is not available.

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Code 1 (yes) if the baseline questionnaire included the question 'Have you ever been told by a doctor or other health care professional that you have had a myocardial infarction (heart attack)?' (or a similar question) and the answer was in the affirmative.
Code 2 (no) if such a question was included in baseline questionnaire and the answer was negative.
Code 9 (insufficient data) if such a question was not included in the baseline questionnaire or if it was included but not answered.

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Code 1 (yes) if there is an ECG which shows Q-waves codable in the Minnesota code as 1-1 or 1-2 (except 1-2-6) [2].
Code 2 (no) if there is an ECG which does not show Q-waves codable in the Minnesota code as 1-1 or 1-2 (except 1-2-6)
Code 9 (insufficient data) if ECG was not included in the baseline examination or if ECG was included but not coded.

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The "Rose' questionnaire" refers to the London School of Hygiene cardiovascular questionnaire, Section B, Possible Infarction [1].

Code 1 (yes) if the baseline questionnaire included the question "Have you ever had a severe pain across the front of your chest lasting for half an hour or more?" (or a similar question) and it was answered in the affirmative.
Code 2 (no) if such a question was included in baseline questionnaire and the answer was negative.
Code 9 (insufficient data) if such a question was not included in the baseline questionnaire or if it was included but not answered.

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Items HISREV1...HISREV2: History of cardiac revascularization

The purpose of these items is to indicate the information on previous cardiac revascularization i.e. coronary artery by-pass graft (CABG) or percutaneous transluminal coronary angioplasty (PTCA) in baseline.

Code 1 (yes) if CABG or PTCA was documented in hospital records, in hospital discharge register or in other health information system.
Code 2 (no) if such source was used to find information on history of cardiac revascularization and the result of the search was negative.
Code 9 (insufficient data) if no such source of information was used or if information of such assessment is not available.

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Code 1 (yes) if the baseline questionnaire included the questions 'Have you ever had coronary artery surgery?' or 'Have you ever had a dilatation of one or more coronary arteries (angioplasty)?' (or similar questions) and one or both of them was answered in the affirmative.
Code 2 (no) if the baseline questionnaire included such questions but the answers were negative.
Code 9 (insufficient data) if such questions were not included in the baseline questionnaire or if they were included but not answered.

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Items HISAP1...HISAP3: History of stable angina pectoris

The purpose of these items is to indicate the information on history of stable angina pectoris in baseline.

Code 1 (yes) if the presence of angina pectoris was based on a review of medical records or if information of angina pectoris was extracted from drug reimbursement register, from hospital discharge register or other health information system.
Code 2 (no) if source of information did not verify the presence of angina pectoris.
Code 9 (insufficient data) if no such source of information was used or if information of such assessment is not available.

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The "Rose' questionnaire" refers to the London School of Hygiene cardiovascular questionnaire, Section A, Chest pain on effort [1].

Code 1 (yes) if at baseline the Chest Pain Questionnaire was administered and the person was classified as having angina pectoris [1].
Code 1 (no) if at baseline the Chest Pain Questionnaire was administered and the person was classified as not having angina pectoris [1].
Code 9 (insufficient data) if the Chest Pain Questionnaire was not administered at the baseline or was administered but classification is unknown.

Note: The individual questions of the Rose' questionnaire on chest pain on effort can be transferred in items CPAIN...CPLOCE.

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Code 1 (yes) if the baseline questionnaire included the question 'Have you ever been told by a doctor that you have had angina pectoris?' (or a similar question) and the answer was in the affirmative.
Code 2 (no) if baseline questionnaire included such questions but the answer was negative.
Code 9 (insufficient data) if no such question was included in the baseline questionnaire, or it was included but the answer is unknown.

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Item HISUC: History of coronary heart disease, type unspecified

This item intends to gather questionniare data of the presence of coronary heart disease at baseline in case the type of coronary heart disease is unspecific in the question. The purpose of the item is to gather information on self-reported history of myocardial infarction, angina pectoris or revascularization in the cases where information on these is available, but its specificity is insufficient for the use of items HISMI2, HISREV2 or HISAP3.

Code1 (yes) if  the baseline questionnaire included the question ' Have you ever been told by a doctor or other health worker that you suffer (or have suffered) from coronary heart disease, i.e. from angina pectoris, myocardial infarction, or have you ever had a coronary artery by-pass graft, coronary angioplasty?' (or similar question) and the answer was in the affirmative.
Code 2 (no) if the baseline questionnaire included such question but the answer was negative.
Code 9 (insufficient data) if the information is already available from items HISMI2, HISREV2 or HISAP3, or ,otherwise, such information is not available.

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Item  HISSTR1...HISSTR2: History of stroke

Code 1 (yes) if previous stroke was documented in some source of information such as the MONICA stroke register or other population-based stroke register, person's medical records, a hospital discharge register or other health information system.
Code 2 (no) if  such source  was used to assess history of stroke, and previous stroke could not be detected there.
Code 9 (insufficient data) if no such source of information was used or if information of such assessment is not available.

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Code 1 (yes) if the baseline questionnaire included either of the questions 'Have you ever been told by a doctor or other health care professional that you have had a stroke?' or 'Have you ever had a stroke?' (or a similar question) and the answer was in the affirmative.
Code 2 (no) if such a question was included in baseline questionnaire and the answer was negative.
Code 9 (insufficient data) if such a question was not included in the baseline questionnaire or if it was included but not answered.

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Item HISDIAB...TREDIAB: History of diabetes

Code 1 (yes) if the baseline questionnaire included either of the questions 'Have you ever been told by a doctor or other health care professional that you have diabetes?' or 'Do you have (suffer from) diabetes?' (or a similar question) and the answer was in the affirmative.
Code 2 (no) if such a question was included in baseline questionnaire and the answer was negative.
Code 9 (insufficient data) if such a question was not included in the baseline questionnaire or, if included, it was not answered.

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Code 1 if the person is currently being treated with insulin, regardless of whether or not he is also receiving tablets.
Code 2 if the person is being treated with tablets, but not with insulin.
Code 3 if the person has diabetes but is currently not being treated with insulin or tablets.

If you cannot separate current treatment from past treatment, then also report past treatment in this item. In such case, please inform MDC about the exceptional coding.

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Items FHISCHD...FHISSTR: Family history of CHD and stroke

Different MPCs have used different age limits for premature CHD in their questionnaire. This item should be coded according to the age limits used in the questionnaire, and the MDC should be informed about the used age limit. The MPCs, where family history of CHD was asked without age limit, but the age of getting the disease was recorded separately should use limits 55 years for men and 65 years for women.

If the information is available only for death, but not for non-fatal events, then code this item according to the death, and inform the MDC that only death was considered.

Code 1 (yes) if, at baseline, a first degree relative (natural father, mother or sibling) was diagnosed as having had a premature coronary heart disease event (myocardial infarction, death from coronary heart disease or a cardiac revascularization procedure).
Code 2 (no) if no first degree relative had a premature CHD event.
Code 9 (insufficient data) if this item was not included in the baseline questionnaire or, if included, it was not answered.

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Different MPCs have used different age limits for premature stroke in their questionnaire. This item should be coded according to the age limits used in the questionnaire, and the MDC should be informed about the used age limit. The MPCs, where family history of stroke was asked without age limit, but the age of getting the disease was recorded separately should use limits 65 years for both men and women.

If the information is available for death only, but not for non-fatal events, then code this item according to the death, and inform the MDC that only death was considered.

Code 1 (yes) if, at baseline, a first degree relative (natural father, mother or sibling) was diagnosed as having had a premature stroke event.
Code 2 (no) if no first degree relative had a premature stroke event.
Code 9 (insufficient data) if this item was not included in the baseline questionnaire or, if included, it was not answered.

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Items DNAAV...DNAREAS: Availability of DNA

Code 1 if DNA (buffy coat/whole blood) is available for the subject.
Code 2 if, although DNA in some form was collected, it is not available for the subject.
Code 3 when DNA was collected only on a subset of the cohort, and the subject does not belong to the subset for which DNA was collected.
Code 8 when no DNA from the entire cohort will be available for the MORGAM study.

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These are for unavailability of DNA although it was collected.

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Items CONSCHD...CONSANY: Type of consent for the use of DNA

Code 1 where a written consent has been obtained to study the disease or cause of death specified for the item.
Code 2 where there is an Ethics Committee approval for anonymized analysis of the disease and the cause of death specified for the item.
Code 3 where there is no consent or approval for using DNA.
Code 8 when DNAAV = 2, 3, 8 or 9. Note that Codes 1 and 2 are also acceptable in this case.

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Code 1 where a written consent has been obtained to study the disease or cause of death specified for the item.
Code 2 where there is an Ethics Committee approval for anonymized analysis of the disease and the cause of death specified for the item.
Code 3 where there is no consent or approval for using DNA.
Code 8 when DNAAV = 2, 3, 8 or 9. Note that Codes 1 and 2 are also acceptable in this case.

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Code 1 where a written consent has been obtained to study the disease or cause of death specified for the item.
Code 2 where there is an Ethics Committee approval for anonymized analysis of the disease and the cause of death specified for the item.
Code 3 where there is no consent or approval for using DNA.
Code 8 when DNAAV = 2, 3, 8 or 9. Note that Codes 1 and 2 are also acceptable in this case.

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Code 1 where a written consent has been obtained to study any cause of death.
Code 2 where there is an Ethics Committee approval for anonymized analysis of any cause of death.
Code 3 where there is no consent or approval for using DNA.
Code 8 when DNAAV = 2, 3, 8 or 9. Note that Codes 1 and 2 are also acceptable in this case.

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Items CPAIN...CPLOCE: Chest pain on effort (Rose' questionnaire)

These items correspond to the questions of the London School of Hygiene Cardiovascular Questionnaire, Section A: Chest Pain on Effort( for administration by an interviewer) [1]. A version with different skip rules is available for self-administration. If such a version was used for data collection, its skip rules can be used for data transfer, even if they are different from those specified below. The edit specifications used in MDC for routine checking of the data allow for both versions of the skip rules.

Code 9 (insufficient data) if such a question was not included in the baseline questionnaire or if it was included but not answered.

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Items MINN1A...MINN9M: Minnesota codes

These items are for the complete Minnesota coding of ECG at baseline [2].

List of incompatible codes

The codes in the left column suppress codes in the right column.

If all codes for a specific data item MINN1A...MINN9M are suppressed, use code "absent".

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Items MINN1A...MINN1U: Minnesota code 1: Q and QS pattern

(Note: The common instructions for MINN1A...MINN9M above concern these items.)

To qualify as a Q-wave, the deflection should be at least 0,1 mV (1 mm in amplitude).
The eligible codes are 1-1-1, ..., 1-1-7, 1-2-1, ...,1-2-8, 1-3-1, ...,1-3-6. Note incompatible codes!
If ECG was taken in the baseline examination, enter the three code numbers of the Minnesota code 1 in the three boxes, omitting the hyphens. For example, if Minnesota code 1-1-2 was present, code 112.
If only 1-1 or 1-2 are available in your records, code the right hand field as 0. For example, for 1-1 code 110.
If no Minnesota code 1 was present, code 100.
If ECG was not taken or the results for Minnesota code are otherwise not available, code 199.

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The purpose of this item is to facilitate the transfer of the Minnesota code from the MPCs where the site was not recorded. If the site was usually recorded in the cohort, the code 188 for MINN1U is acceptable also for the occasional subjects for whom each of MINN1A, MINN1B and MINN1C was coded 199.

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Item MINN2: Minnesota code 2: QRS Axis Deviation

(Note: The common instructions for MINN1A...MINN9M above concern this item.)

The eligible codes are: 2-1, ..., 2-5.  Note incompatible codes!
If ECG was taken in the baseline examination, enter the two code numbers of the Minnesota code 2 in the two boxes, omitting the hyphen. For example, if Minnesota code 2-1 was present, code 21.
If no Minnesota code 2 was present, code 20.
If ECG was not taken or the results for Minnesota code are otherwise not available, code 29.

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Item MINN3: Minnesota code 3: High Amplitude R Waves

The eligible codes are: 3-1, ..., 3-4.
If ECG was taken in the baseline examination, enter the two code numbers of the Minnesota code 3 in the two boxes, omitting the hyphen. For example, if Minnesota code 3-2 was present, code 32.
If no Minnesota code 2 was present, code 30.
If ECG was not taken or the results for Minnesota code are otherwise not available, code 39.

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Items MINN4A...MINN4U: Minnesota code 4: ST junction and segment depression

(Note: The common instructions for MINN1A...MINN9M above concern these items.)

The eligible codes are: 4-1-1, 4-1-2, 4-2, 4-3 and 4-4.  Note incompatible codes!
If ECG was taken in the baseline examination, and code 4-1-1 or 4-1-2 was present, code 411 or 422 respectively.
If codes 4-2, 4-3 or 4-4 were present, code the right hand field as zero. For example, for 4-2 code 420.
If no Minnesota code 4 was present, code 400.
If ECG was not taken or the results for Minnesota code are otherwise not available, code 499.

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The purpose of this item is to facilitate the transfer of the Minnesota code from the MPCs where the site was not recorded. If the site was usually recorded in the cohort, the code 488 for MINN4U is acceptable also for the occasional subjects for whom each of MINN4A, MINN4B and MINN4C was coded 499.

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Items MINN5A...MINN5U: Minnesota code 5: T-Wave items

(Note: The common instructions for MINN1A...MINN9M above concern these items.)

The eligible codes are 5-1, ..., 5-4.  Note incompatible codes!
If ECG was taken in the baseline examination, enter the two code numbers of the Minnesota code 5 in the two boxes, omitting the hyphen. For example, if Minnesota code 5-4 was present, code 54.
If no Minnesota code 5 was present, code 50.
If ECG was not taken or the results for Minnesota code are otherwise not available, code 59.

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The purpose of this item is to facilitate the transfer of the Minnesota code from the MPCs where the site was not recorded. If the site was usually recorded in the cohort, the code 58 for MINN5U is acceptable also for the occasional subjects for whom each of MINN5A, MINN5B and MINN5C was coded 59.

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Item MINN6: Minnesota code 6: A-V conduction defect

(Note: The common instructions for MINN1A...MINN9M above concern this item.)

The eligible codes are: 6-1, 6-2-1, ..., 6-2-3, 6-3, 6-4-1, 6-4-2, 6-5, 6-6, 6-8.   Note incompatible codes!
If ECG was taken in the baseline examination, and one of the three number codes was present, enter the three code numbers in the three boxes, omitting the hyphens. For example, if Minnesota code 6-2-2 was present, code 622.
If one of the two number codes was present, code the right hand field as 0. For example, for 6-5 code 650.
If no Minnesota code 6 was present, code 600.
If ECG was not taken or the results for Minnesota code are otherwise not available, code 699.

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Item MINN7: Minnesota code 7: Ventricular conduction defect

(Note: The common instructions for MINN1A...MINN9M above concern this item.)

The eligible codes are 7-1-1, ..., 7-1-2, 7-2-1, ..., 7-2-2 and 7-3, ..., 7-8.   Note incompatible codes!
If ECG was taken in the baseline examination, and one of the three number codes was present, enter the three code numbers in the three boxes, omitting the hyphens. For example, if Minnesota code 7-1-2 was present, code 712.
If one of the two number codes was present, code the right hand field as 0. For example, for 7-4 code 740.
If no Minnesota code 7 was present, code 700.
If ECG was not taken or the results for Minnesota code are otherwise not available, code 799.

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Item MINN8: Minnesota code 8: Arrhytmias

(Note: The common instructions for MINN1A...MINN9M above concern this item.)

The eligible codes are: 8-1-1, ..., 8-1-5, 8-2-1, ..., 8-2-4, 8-3-1, ..., 8-3-4, 8-4-1, 8-4-2, 8-5-1, 8-5-2, 8-6-1, ..., 8-6-4, 8-7, 8-8, 8-9.  Note incompatible codes!
If ECG was taken in the baseline examination, and one of the three number codes was present, enter the three code numbers in the three boxes, omitting the hyphens. For example, if Minnesota code 8-3-1 was present, code 831.
If one of the two number codes was present, code the right hand field as 0. For example, for 8-7 code 870.
If no Minnesota code 8 was present, code 800.
If ECG was not taken or the results for Minnesota code are otherwise not available, code 899.

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Items MINN9A...MINN9U: Minnesota code 9-2: ST Segment Elevation

(Note: The common instructions for MINN1A...MINN9M above concern these items.)

The only eligible code is 9-2.  Note incompatible codes!
If ECG was taken in the baseline examination and the Minnesota code 9-2 was present, code 92.
If no Minnesota code 9-2 was present, code 90.
If ECG was not taken or the results for Minnesota code are otherwise not available, code 99.

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The purpose of this item is to facilitate the transfer of the Minnesota code from the MPCs where the site was not recorded. If the site was usually recorded in the cohort, the code 98 for MINN9U is acceptable also for the occasional subjects for whom each of MINN9A, MINN9B and MINN9C was coded 99.

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Item MINN9M: Minnesota code 9 (other than 9-2): Miscellaneous Items

(Note: The common instructions for MINN1A...MINN9M above concern this item.)

The eligible codes are: 9-1, 9-3, 9-4-1, 9-4-2, 9-5, 9-8-1, 9-8-2. Note incompatible codes!
If ECG was taken in the baseline examination, and one of the three number codes was present, enter the three code numbers in the three boxes, omitting the hyphens. For example, if Minnesota code 9-8-1 was present, code 981.
If one of the two number codes was present, code the right hand field as 0. For example, for 9-3 code 930.
If no Minnesota code 9 was present, code 900.
If ECG was not taken or the results for Minnesota code are otherwise not available, code 999.

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References

1. Rose GA, Blackburn H, Gillum RF, Prineas RJ. Cardiovascular survey methods (Second Edition). World Health Organization, Monograph Series No. 56, 1982.
2. Prineas R.J., Crow R.S. and Blackburn H. (1982) The Minnesota Code Manual of Electrocardiographic Findings. Standards and Procedures for Measurement and Classification. John Wright/PSG Inc, Boston/Bristol/London. ISBN 0 1236 2053 3.

Updates

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