Table 2.
Scope of the analysis. Own categorization.
| Scope | Description | Relevant articles | 
|---|---|---|
| Local level | Studies covering one or several villages, local towns, city neighborhoods, or settlements | (36, 38, 40, 45, 52–58, 60, 61) | 
| City level | Studies covering one or several cities | (31, 34, 35, 37, 39, 42, 43, 59) Nighttime light as proxy: (50) | 
| Regional level | Studies covering one or several districts, provinces, or states | (32, 33, 41, 44); nighttime light as proxy: (66) | 
| National level | Studies covering an entire country | Nighttime light as proxy: (48, 49, 51, 63) | 
| International level | Studies covering at least two countries | Nighttime light as proxy: (46, 47, 64, 65) |