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Stepwise selection
| R2 | Adjusted R2 | C(p) | F value | Pr>F | |
| Average coverage area per tertiary care centre | 0.5667 | 0.5667 | 22.3181 | 57.54 | <0.0001 |
| Kilometres of highway road per square kilometre | 0.1054 | 0.6721 | 8.6749 | 13.82 | 0.0006 |
| Population | 0.0480 | 0.7201 | 3.5429 | 7.21 | 0.0103 |
