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).


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.

Note: The content above has been extracted from a research article, so it may not display correctly.

Please log in to submit your questions online.
Your question will be posted on the Bio-101 website. We will send your questions to the authors of this protocol and Bio-protocol community members who are experienced with this method. you will be informed using the email address associated with your Bio-protocol account.

We use cookies on this site to enhance your user experience. By using our website, you are agreeing to allow the storage of cookies on your computer.