Table 1.

Basic Characteristics of Study Population

Variables	n (%)
Included women in the study	2 046 048
Median follow‐up (interquartile range) in years	3.4 (1.4–7.5)
Pregnancy outcome (total pregnancies n=453 800)
Live births	451 765 (99.55)
Stillbirths	2035 (0.45)
Study follow‐up time in person‐years (total person‐years=10 170 974)
Nonpregnant time	9 759 438 (95.95)
Antepartum	308 378 (3.03)
Peripartum	4967 (0.05)
Postpartum	98 191 (0.97)
Cases of first stroke (total cases=2511)
Nonpregnant time	2440 (97.17)
Pregnant time	71 (2.83)