Table 1. Characteristics of mothers, and characteristics of pregnancies and births as reported by the mothers in the RHINE III questionnaire.

Mother’s characteristics
N Mothers		715
N Children per mother, median (IQR*)		2 (2–3)
Mother’s age when filling out questionnaire, mean (SD)		51.4 (6.9)
Mother’s marital status when filling out questionnaire, n (%)
	Married/Cohabitant	594 (83.1)
	Widowed/Divorced/Separated	84 (11.8)
	Single	26 (3.6)
	Do not wish to answer	6 (0.8)
Mother’s education**, n(%)
	Primary	55 (7.7)
	Secondary	292 (40.8)
	University/College	363 (50.8)
Mother’s reported characteristics of pregnancies/births
N Children		1629
Birthyear of children, min-max		1967–2010
Recall years, mean (SD)		22.7 (9.2)
Gender of children, n(%)
	Boys	814 (50.0)
	Girls	752 (46.2)
	Missing	63 (3.9)
Birthweight in kg, mean (sd)		3.5 (0.6)
Low birthweight (<2.5 kg), n(%)
	No	1392 (85.5)
	Yes	73 (4.5)
	Missing	164 (10.1)
Gestational age at birth
	<32 weeks	29 (1.8)
	32–36 weeks	101 (6.2)
	37–42 weeks	1220 (74.9)
	>42 weeks	253 (15.5)
	Missing	26 (1.6)
Induction of labour, n(%)		312 (19.2)
Mode of delivery
	Spontaneous vaginal	1260 (77.4)
	Forceps	83 (5.1)
	Vacuum	37 (2.3)
	Caesarean section	152 (9.3)
	Missing	97 (6.0)

*IQR:Inter quartile range

**According to the question: “Please mark the educational level which best describes your level: 1) Primary school 2) Lower or upper secondary 3) College or university