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. 2021 Aug 22;36(8):861–872. doi: 10.1007/s10654-021-00793-x

Table 1.

Baseline characteristics for 3307 mothers at the time of 4212 pregnancies

Unexposed (reference) Exposed
n pregnancies (%) 3327 (79) 885 (21)
Maternal age (SD) 27.9 (5.4) 27.5 (5.4)
Maternal ethncity
 Nordic contries % 64 68
 Non-nordic contries % 36 32
 Missing % 0 0
Maternal level of education
 Low % 35 30
 Middle % 27 26
 High % 17 15
 Missing % 21 29
Calendar time of conception
 1970–1979% 11 16
 1980–1989% 27 29
 1990–1999% 27 26
 2000–2009% 21 19
 2010–2018% 14 10
Maternal smoking up to pregnancya
 No % 69 68
 Yes % 23 22
 Missing % 8 10

SD standard deviation

aAvailable since 1991 (unexposed n = 2028 and exposed n = 476)