Epigenetic gestational age and trajectories of weight and height during childhood: a prospective cohort study

Clinical Epigenetics

Table 1 Characteristics of the study sample (n = 785)

	n	% of study sample
Sex of child
Male	387	49.3
Female	398	50.7
Maternal age (years)
35+	107	13.6
25–34	586	74.7
15–24	92	11.7
Maternal education*
Degree or above	160	20.4
A level	242	30.8
O level	258	32.9
Less than O level	125	15.9
Maternal smoking during pregnancy
Never	477	60.8
Ever	308	39.2
Maternal pre-pregnancy BMI
Under/normal weight	637	81.2
Overweight	111	14.1
Obese	37	4.7
Maternal marital status during pregnancy**
Never married	93	11.9
Married	650	83.1
Divorced/separated/widowed	39	5.0
Parity**
0	651	84.3
1	93	12.1
2+	28	3.6
	Median	IQR***
Gestational age at birth (weeks)	40	39, 41

*O level (ordinary level: exams taken in different subjects usually at age 15–16 at the completion of legally required school attendance, equivalent to today’s UK General Certificate of Secondary Education), A level (advanced level: exams taken in different subjects usually at age 18), or university degree or above
**Denominator less than 785 as data not required for inclusion in the study population
***Interquartile range

ISSN: 1868-7083