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Age group definitions following MeSH definitions
| Age group | MeSH definition | Trend group |
|---|---|---|
| Newborn | Birth to 1 mo | Neonate |
| Infant | 1–23 mo | Pediatric |
| Preschool child | 2–5 yrs | |
| Child | 6–12 yrs | |
| Adolescent | 13–18 yrs | |
| Adult | 19–44 yrs | Adult |
| Middle-aged | 45–64 yrs | |
| Aged | 65–79 yrs | Elderly |
| Aged 80 and over | 80 yrs and over |
