Hospital admissions for medical diagnoses (non-surgical diagnosis-related group (DRG) grouping) of at least 1 day were included in the analysis. In addition, admissions with certain primary diagnoses not considered paediatric medicine were excluded (for a detailed list of diagnoses, see online supplemental file 1). Admission episodes with less than 8 hours in between department stays were considered as one admission. Admissions that consisted of two or more department stays were registered as medical visits if all stays were registered with a medical diagnosis. Admissions were registered by the year of discharge. In addition, four subsamples of admissions were defined using primary and secondary diagnosis codes: gastroenteritis, viral and bacterial infections (excluding gastroenteritis), epilepsy and asthma (for details, see online supplemental file 1).

bmjopen-2020-046656supp001.pdf

Parental educational level was coded using the international standard classification of education. Larger numbers represented higher educational level; 0 indicated less than primary education and 8 indicated a doctorate or equivalent, while 9 was not classified and regarded as missing. Educational level was recoded into three categories: low (0–2), medium (3–5) and high (6–8). The number of siblings was computed each year according to birth year, and analysed as a dichotomous variable; only child or child with siblings.

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