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Basic information about the 15 districts included in this study.
| Province | District | Population | No. Sub-districts |
| West Java | Ciamis | 1458680 | 36 |
| Cirebon | 2134656 | 37 | |
| Garut | 2274973 | 41 | |
| Subang | 1402134 | 22 | |
| Sukabumi | 2240901 | 45 | |
| Central Java | Brebes | 1727708 | 17 |
| Cilacap | 1717273 | 24 | |
| Jepara | 1078037 | 14 | |
| Pemalang | 1341422 | 14 | |
| Rembang | 591786 | 14 | |
| East Java | Jombang | 1203716 | 21 |
| Ngawi | 857449 | 19 | |
| Pamekasan | 782917 | 13 | |
| Sampang | 801541 | 14 | |
| Trenggalek | 682328 | 14 |
