Table 1.

Study characteristics.

	AYATS	PREG
N	137	131
Study phenotype	Internalizing disorders (e.g., early-onset major depression)	Perinatal health outcomes (e.g., preterm birth)
Age	16.96 (1.28)	29.06 (4.99)
Sex (% female)	97 (71%)	131 (100%)
Ethnicity (% Caucasian)	132 (97%)	67 (51%)
Methylation probes tested	445,120	421,729
Expression probes tested	10,913	12,249

Study characteristics were assessed after preprocessing and removal of poor quality samples.

Mean (standard deviation) or N (%).

Abbreviations. AYATS = Adolescent and Young Adult Twin Study; PREG = Pregnancy, Race, Environment, Genes cohort.