Men N = 6975

1
Helsinki Birth Cohort Study (HBCS)
N 13,345
Men
N 6975
Cognitive testing N 931 at
age 68.5 years
Cognitive testing N 2786 at
age 20.1 years
Maternal blood pressure N 1436 and
urinary protein tests not recorded
Maternal blood pressure N 489 and
urinary protein tests not recorded
Missing, implausible or N
154 post-term length of gestation
Missing, implausible or N 44 post-term
length of gestation
Participants born N
398 preterm or at term included in the current
study
Participants born N
1196 preterm or at term with complete data
on 20.1 years available
Figure e-1. Selection of the participants