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Definitions of urban areas for papers that conducted data collection or analysis (n = 115)
| Urban definitions and comparison groups | Number (%) of articles |
|---|---|
| General urban areas | 58 (50%) |
| Urban slums (no comparison area) | 26 (23%) |
| Slum vs other urban areas | 8 (7%) |
| Urban vs rural | 14 (12%) |
| Urban poor | 4 (3%) |
| Peri-urban setting | 2 (2%) |
| Informal settlements/inner city | 2 (2%) |
| Urban gradient/urbanicity | 1 (1%) |
