Table 3.
Results of logit models of decision to refer/not refer
| Variables | Model 1a | Model 1b |
|---|---|---|
| Intercept | −1.062*** | −13.12*** |
| (0.371) | (4.503) | |
| Nevus | 5.008*** | 5.901*** |
| (0.474) | (0.737) | |
| Melanoma | 5.549*** | 5.409*** |
| (0.598) | (0.680) | |
| Psoriasis | 1.746*** | 1.761*** |
| (0.279) | (0.358) | |
| Waiting time | 0.000184 | 0.0000828 |
| (0.000938) | (0.00118) | |
| Distance | −0.00403 | −0.00286 |
| (0.00325) | (0.00411) | |
| Pressure | 0.0671 | 0.219 |
| (0.246) | (0.316) | |
| Age | 0.606** | |
| (0.245) | ||
| Male | −0.186 | |
| (0.650) | ||
| Distance hospital | 0.0400** | |
| (0.0162) | ||
| Distance private | −0.0293 | |
| (0.0214) | ||
| List size | 0.0000163 | |
| (0.0000227) | ||
| Telemedicine | −1.911*** | |
| (0.603) | ||
| Special interest | −1.149** | |
| (0.526) | ||
| Health status: bad | 0.423 | |
| (0.481) | ||
| Health status: good | −1.698 | |
| (1.377) | ||
| Age-squared | −0.00680** | |
| (0.00293) | ||
| Observations | 721 | 473 |
| AIC | 514.1 | 327.2 |
| Log likelihood | −249.1 | −145.6 |
| Chi-squared | 152.5*** | 95.37*** |
| Hosmer & Lemeshow Chi-squared | 12.22 | 13.84* |
| % pred. correctly | 82.25% | 86.47% |
| Area under ROC | 0.8763 | 0.9215 |
***significant at 1% level; **significant at 5% level; *significant at 10%. Dependent variable is a dummy variable indicating whether a referral was made. Base categories for explanatory dummy variables: Need – Keratosis; Pressure – No; Telemedicine – No; Special interest – No; Health status – Neither good nor bad; standard errors in parenthesis.