TROMSO_STR_HIST3

 Name: STR_HIST3

Description and values:

• 1 = yes
• 0 = no
• 9 = insufficient data

Code 1 if history of stroke was documented or self-reported 

Code 0 if no history of stroke at baseline.

Code 9 if no such source information was available on stroke at baseline.

Local variable explanation:

datoslag= date of documented stroke

dslag= documented stroke

date_t4: date of examination

SAS code:

if (datoslag ne . and dslag =1 and sign(datoslag-date_t4)=-1) or Str_hist2 EQ 1 then STR_HIST3=1;

else STR_HIST3=0;                                                                                                                                                                                       

SHARE_STR_HIST3

STR_HIST3 is based on the STR_HIST2 variable.

SENECA_STR_HIST3

The variable is identical to STR_HIST2.

NSWEDEN_STR_HIST3

STR_HIST3=9;
IF STR_HIST1=1 OR STR_HIST2=1 THEN STR_HIST3=1;

MORGAM_STR_HIST3

This was derived from the MORGAM derived variable BASESTR1 using the following rule:

EPIC_STR_HIST3

Description:

Self-reported or documented history of stroke

Description of variables used:

STROKE: EPIC elderly Greece variable that shows prevalence of stroke (1=yes, 2= don't know, 0=no)

Coding rule:

Variable STR_HIST3 is identical to EPIC variable STROKE.
Furthermore, if the person does not know if they have suffered a stroke then STR_HIST3 is equal to 9.
If STROKE is a missing value then STR_HIST3 is equal to 0.

Stata script:

gen STR_HIST3= STROKE
recode STR_HIST3 2=9
recode STR_HIST3 .=0

*only self recorded history of stroke is recorded