Table 1

Distribution of early-life characteristics in two generations from the Uppsala Multi-generational birth cohort, Sweden

Early-life characteristics	Generation 1		Generation 2		P value
Early-life characteristics	N	%	N	%	P value
Family socioeconomic position
High	909	8.9	2247	37.1	0.001
Medium	4213	41.2	1466	24.2
Low	5111	49.9	2342	38.7
Mother’s marital status
Married	8514	83.2	5449	90.0	0.001
Unmarried	1719	16.8	606	10.0	0.001
Mother’s parity
1	3821	37.3	2823	46.6	0.001
2	2490	24.3	1982	32.7
≥3	3922	38.3	1250	20.6
Birth weight (standardised)
SGA	920	9.0	613	10.1	0.051
Normal	8255	80.7	4838	79.9
LGA	1058	10.3	604	10.0
Length of gestation
Preterm (≤36 weeks)	727	7.1	362	6.0	0.019
Term (37–41 weeks)	8274	80.9	4970	82.1
Post-term (≥42 weeks)	1232	12.0	723	11.9
Multiplicity of birth
Singleton	9971	97.4	5960	98.4	0.001
Twin/triplet	262	2.6	95	1.6	0.001
Mother’s age (years) at birth
<20	458	4.5	510	8.4	0.001
20–24	2692	26.3	2093	34.6
25–29	2913	28.5	2144	35.4
30–34	2147	21.0	1044	17.2
≥35	2023	19.8	264	4.4
Total	10 233	100	6055	100