Participant characteristics
Characteristic	Description/Detail from report
1. Age (range, mean/SD, median, etc., within each group, if provided. Report on the number of children younger than age 16)
2. Sex of participants (numbers, %, etc., within each group, if provided)
3. Primary diagnosis(disease, condition or injury) and co‐morbidities reported at baseline (description, numbers, %, etc., within each group, if provided)
4. Severity of illness score/scale at baseline (type of measurement tool, description of scale/score including lower and upper limits, numbers, %, mean/SD, median, range, etc., within each group, if provided)
5. Physiological, immunological, biochemicalmeasurements or diagnostic findings reported at baseline as indicators of participant’s diagnosis and/or severity of illness (description of measurements and findings, number, %, mean/SD, median, range, etc., within each group, if provided)