Table 1. Sociodemographic description of the participating children at 5-year follow-up (N = 7443)

Sociodemographic data	Participating children at 5-year follow-up
	n	%
Sex
Male	3885	52.2
Female	3558	47.8
Birth weight <2.500 grams	211	2.8
Small for gestational age	147	2.0
Born in or before week 36	153	2.1
Mother smoking during pregnancy	586	7.9
Mother’s education level^a
9 years / primary school	465	6.4
12 years / high school	4293	59.0
University degree	2518	34.6
Father’s education level^b
9 years / primary school	915	12.7
12 years / high school	4484	62.3
University degree	1804	25.0
Mother’s place of birth^c
Born in Sweden	7132	98.0
Born outside of Sweden	148	2.0
Parental civil status^c
Married	3279	45.0
Cohabitant	3913	53.8
Single parent	88	1.2
Received antibiotics prescription during 2005–2014	6231	83.7
Median age of mothers at childbirth, years (range)	29 (16 to 45)
Median birth weight, grams	3595