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Odds ratio for using laboratory tests: Use of basic lab fee per contact, dichotomized by median value (0.2756) (3802 doctors were included in the analysis).
| Odds ratio | 95% confidence interval | |
| Old vs. young doctor1 | 0.53 | 0.46–0.62 |
| Female vs. male doctor | 1.23 | 1.07–1.42 |
| RGP vs. other doctor | 0.99 | 0.86–1.15 |
| Central vs. rural OOH service2 | 1.98 | 1.72–2.27 |
Notes: 1Dichotomized by median age (38). 2Central is two highest centrality categories, rural two lowest.
