See the definition of variable STR_HIST1_DATE.

TROMSO_STR_HIST1_DATE

Name: STR_HIST1_DATE

Short description: Date of documented stroke diagnosis

Type: Date (format: YYYY-MM-DD, e.g. 2011-01-01)

Description and values:

The date at which the subject was diagnosed with a documented stroke

If information is missing then code 9999.

Local variable explanation:

datoslag= date of documented stroke

SAS code:

If STR_HIST1 EQ 1 then STR_HIST1_DATE=datoslag;

else STR_HIST1_DATE=9999;