Multivariate model for the proportion of billings related to obstetric care
| VARIABLES | OR (95% CI) |
|---|---|
| Female sex | 1.25 (1.09–1.43)* |
| Year (continuous) | 0.96 (0.94–0.99)* |
| Female sex–year interaction | 1.02 (1.00–1.04) |
| Rurality-time interaction | |
| • Metropolitan | 0.98 (0.95–1.00) |
| • Urban | 0.95 (0.92–0.98)* |
| Age, y | |
| • 35 to < 45 | 0.84 (0.78–0.91)† |
| • 45 to < 55 | 0.80 (0.73–0.88)† |
| • 55 to < 65 | 0.75 (0.68–0.84)† |
| • ≥ 65 | 0.76 (0.66–0.87)‡ |
| Rurality | |
| • Metropolitan | 0.87 (0.73–1.02) |
| • Urban | 1.11 (0.92–1.33) |
| International training | 0.92 (0.76–1.10) |
| Rurality-training interaction | |
| • Metropolitan-international | 0.88 (0.72–1.09) |
| • Urban-international | 0.81 (0.65–1.02) |
| Higher proportion of alternative payments | 1.43 (1.23–1.65)† |
| Higher proportion of contacts with female patients aged 18–44 y | 1329.42 (955.18–1850.29)† |
| Higher proportion of contacts with patients ≥ 1 major ADGs | 1.49 (1.12–1.97)* |
| Higher proportion of contacts with patients in the lowest income quintile | 0.78 (0.56–1.11) |