TROMSO_STR1_TIME

Name: STR1_TIME

Description and values:

STR1_TIME gives the length (in days) of the follow-up for a stroke event type 1.

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;

STR1_TIME=STR1_EXIT-DATE_T4;

SHARE_STR1_TIME_altered

STR1_TIME_altered counts the time until a stroke event occurs. It is calculated by: STR1_EXIT_altered - CONTACT_DATE if STR1_EXIT_altered != .

STR1_TIME_altered equals zero for those cases for which no information on the date of event was available and thus STR1_EXIT_altered was set to CONTACT_DATE.  STR1_TIME_altered is system missing if no event occured or just a baseline interview was available (and for the time after an event).

MORGAM_STR1_TIME

This is obtained from the MORGAM derived variable STRTIME1.

If STRTIME1 = 88888 or 99999, STR1_TIME is coded "0" .

ESTHER_STR1_TIME

str1_time = str1_exit - contact_date;
if str_hist2 ne 1 and str1 = . then str1_time = 0
if str_hist2 = 1 then str1_time = .;

Variables str_hist2 are CHANCES variables.

EPIC_STR1_TIME

Description:

Follow-up time to the first cerebrovascular event type 1 (STR1)

Description of variables used:

D_RECRUI: Epic Elderly variable that shows the date of recruitment

Coding rule:

If the date of recruitment and the date of the exit from the cerebrovascular follow up are both available then variable STR1_TIME is produced from the formula: Date of exit from the follow-up for first cerebrovascular event type 1 - Date of recruitment.

Stata script:

gen STR1_TIME=STR1_EXIT-  D_RECRUI if STR1_EXIT~=. &  D_RECRUI~=.