Table 1. Characteristics of all participants, and divided into obese and non-obese.

Reported as median (5–95 percentiles) unless otherwise stated.

	Exploratory cohort (DNBC)			Replication cohort (ALSPAC)
	All	Obese	Non-obese	All	Obese	Non-obese
N	2,118	990	1,128	4,841	238	4,603
Maternal age at conception, years	30 (24, 38)	30 (24, 38)	30 (24, 38)	28 (21, 36)	28 (20, 37)	28 (21, 36)
BMI	30.1 (19.4, 41.0)	35.7 (33.4, 43.0)	22.5 (18.7, 29.7)	22.2 (18.7, 29.8)	32.7 (30.2, 41.33)	22.0 (18.6, 27.4)
GWG, kg	13 (4, 25)	10 (3, 25)	15 (8, 25)	16.6 (8.2, 25.5)	13.1 (0.8, 24.3)	16.7 (8.7, 25.6)
Gestational age at birth, weeks	40 (37, 42)	40 (37, 42)	40 (37, 42)	40 (38, 42)	40 (37, 42)	40 (38,42)
Primiparous, %	49.8	49.2	50.4	50.6	42	51
Total energy, kJ/day	9,640 (6,068, 14,518)	9,174 (5,783, 14,304)	9,951 (6,360, 14,618)	7,157 (4,407, 10,579)	6,483 (3,886, 10,184)	7,181 (4,444, 10,622)
Fatty fish, weekly servings	0.0 (0.0, 1.1)	0.0 (0.0, 0.9)	0.0 (0.0, 1.3)	0.4(0, 1.4)	0.4 (0, 1.4)	0.4 (0, 1.4)
Lean fish, weekly servings	0.5 (0, 2.1)	0.3 (0, 2)	0.5 (0.0, 2.4)	0.7 (0, 2.0)	0.4 (0, 2.9)	0.7 (0, 2.0)
Total fish, weekly servings	0.6 (0, 3.0)	0.5 (0, 2.8)	0.8 (0.0, 3.4)	1.6 (0, 3.5)	1.1 (0, 4.4)	1.6 (0, 3.5)
n-3 fatty acids (g/day)	0.6 (0.3, 1.2)	0.6 (0.3, 1.1)	0.7 (0.4, 1.2)	NA	NA	NA
n-6 fatty acids (g/day)	2.5 (1.2, 4.3)	2.5 (1.3, 4.3)	2.6 (1.3, 4.3)	NA	NA	NA
Non-smokers, %	85.1	85.5	84.7	81.9	80.2	82
Low social-occupational status, %	12.4	16.3	8.9	16.4	22.7	16.1
Alcohol, % non-drinkers	60.3	69.2	52.2	43.4	50.8	43
Physically inactive, %	64.9	67.5	62.4	32.6	31.1	32.7
GRS	28 (23, 34)	29 (23, 34)	28 (22, 34)	NA	NA	NA

Abbreviations: BMI, body mass index; GWG, gestational weight gain; GRS, sum of the BMI-associated risk alleles