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. Author manuscript; available in PMC: 2018 Jan 26.
Published in final edited form as: JAMA Psychiatry. 2016 May 1;73(5):497–505. doi: 10.1001/jamapsychiatry.2016.0129

Table 1.

The number of sample size and distribution of AFB across four cohorts.

Cohort Sample size Mean Age (interview) Range Age Mean AFB Range AFB
EGCUT 1660 67.3 45–101 24.8 15–46
LifeLines 5344 53.1 27–93 26.7 16–43
STR 3262 58.2 45–86 25.1 14–52
TwinsUK 1981 55.4 25–86 25.7 14–44

Abbreviation: AFB, maternal age at first birth. EGCUT, the Estonian Genome Center Biobank, University of Tartu. STR, the Swedish Twin Registry.