TROMSO_STR1_EXIT

Name: STR1_EXIT

Description and values:

STR1_EXIT is the date of exit from the follow-up for first stroke event type 1.

The exit takes place when the earliest one of the following events occur:

• onset of symptoms or recorded diagnosis of first stroke event type 1;
• the person dies;
• the person is alive at the fixed end-date of a follow-up period or the individual end-date of follow-up, such as date of questionnaire return or date of interview;
• the person is lost to follow-up. Most likely reasons are: change of contact information, emigration to another country or refusal to participate in the study any longer.

Local variable explanation:

datoslag: date of stroke event.

date_t4: date of examination

flyttedato: date of relocation from town/municipality

dslag: stroke event

dato_dod: date of death

SAS code:

if sign(datoslag-'31dec2010'd)=1 or sign(date_t4 - datoslag)=1 then do;

dslag=.;

datoslag=.;

end;

IF DSLAG = 1 and sign(DATOSLAG-FLYTTEDATO)=1 then do; 

STR1_EXIT=FLYTTEDATO;

end;

ELSE IF DSLAG = 1 and .<(DATO_DOD -DATOSLAG)<=28 then do; 

STR1_EXIT=DATOSLAG; 

end;

else if DSLAG = 1 then do;

STR1_EXIT=DATOSLAG;

end;

else do;

STR1_EXIT=min(FLYTTEDATO,dato_dod,'31dec2010'd);

end;

SHARE_STR1_EXIT_altered

The date of a stroke was only asked in wave 4 of SHARE and is stored in variable ph077_2. STR1_EXIT_altered is based on ph077_2 for wave 4, for wave 2 (as well as missing information in ph077_2 in wave 4) STR1_EXIT_altered is set to CONTACT_DATE. For fatal stroke events STR1_EXIT_altered equals MORT_EXIT.

STR1_EXIT_altered is only filled for respondents with (fatal or non-fatal) stroke event. For respondents with no event during the follow-up period and respondents with only a baseline interview, STR1_EXIT_altered is . = system missing. This is the reason for the suffix "_altered".  

NSWEDEN_STR1_EXIT

Please contact us for a description of this variable.

MORGAM_STR1_EXIT

This was obtained from the MORGAM derived variable STRDATE1 by converting the latter to the CHANCES date format.

If STRDATE1 = 88888888 or 99999999, CONTACT_DATE is coded for STR1_EXIT.

ESTHER_STR1_EXIT

str1_exit = apop_dat;
if str_hist2 ne 1 and str1 = . then str1_exit = contact_date;
if str_hist2 = 1 then do str1_exit = .;
format str1_exit yymmddd10.;

Source of apop_dat: Questions on incident myocardial infarction at 2-, 5- and 8-year follow-up. Validated by questionnaires to the physician.

Source of mort_dat: Inhabitants Registration Offices of Saarland.
Variable str_hist2 is a CHANCES variable.

EPIC_STR1_EXIT

Description:

Date of exit from the follow-up for cerebrovascular event type 1 during follow-up (STR1)

Description of variables used:

VIT_STAT: EPIC variable vital status shows the vital status at the end of follow up (the person was alive at the end of the follow up (VIT_STAT=1), the person was dead at the end of the follow up (VIT_STAT=2), the person does not want to continue to participate (VIT_STAT=6), the person emigrated to another region (VIT_STAT=7) or to another country (VIT_STAT=8) or the vital status is unknown (VIT_STAT=9)) .

D_ENDFUP: epic elderly variable that shows date of the end of follow up

D_DTHLST:epic elderly variable that shows censoring date for dead/lost to follow-up

A_STROKEFU_HDR_MR:  Age of hospitalisation (in years) during follow up for the suspected cerebrovascular event diagnosis according to hospital discharge records or medical records

Coding rule:

Variable STR1_EXIT is equal to D_DTHLST,  if there has been underlying cerebrovascular death (STR1=1).

STR1_EXIT is equal to the date of the end of follow up (D_ENDFUP), if medical records show non definite cerebrovascular event (STR1=3) and the person was alive at the end of the follow up (VIT_STAT=1).

COR1_EXIT is equal to the censoring date for dead or lost to follow up (D_DTHLST), if medical records show non definite cerebrovascular event (STR1=3)  and the person was dead at the end of the follow up (VIT_STAT=2) or does not want to continue to participate (VIT_STAT=6) or emigrated to another region (VIT_STAT=7) or to another country (VIT_STAT=8) or the vital status is unknown (VIT_STAT=9) .

If there was no underlying cerebrovascular death (STR1=2) and the age of hospitalisation (in years) for the suspected cerebrovascular event diagnosis (according to hospital discharge records or medical records) is available (A_STROKEFU_HDR_MR~=.), then STR1_EXIT is produced from the formula: date of recruitment + (age at the suspected stroke diagnosis  - age at recruitment)*number of days in one year.

Otherwise STR1_EXIT is coded as missing if the date of exit from the cerebrovascular event follow up is earlier than the date of recruitment (STR1_EXIT<D_RECR)

Stata script:

gen     STR1_EXIT = D_DTHLST  if STR1==1
replace STR1_EXIT = D_ENDFUP  if STR1==3 & VIT_STAT==1
replace STR1_EXIT = D_DTHLST  if STR1==3 & VIT_STAT>=2
replace STR1_EXIT = D_RECRUI + (A_STROKEFU_HDR_MR-AGE_RECR)*365.25 if STR1==2 & A_STROKEFU_HDR_MR~=. & AGE_RECR~=.

replace STR1_EXIT=. if STR1_EXIT<D_RECR & D_RECRUI~=.