Table 4.
Multivariate, stepwise logistic regression of predictors of first EMS contact within 120 minutes (n = 273).
| Independent variables | B | SE | Wald's χ2 | df | p | OR | 95% CI |
|---|---|---|---|---|---|---|---|
| Distance (reference <10 miles) | 0.87 | 0.31 | 7.71 | 1 | 0.005 | 2.39 | (1.30–4.38) |
| Marital status: unmarried (reference: married) | 0.80 | 0.31 | 6.81 | 1 | 0.009 | 2.22 | (1.21–4.09) |
| Self-medicated | 2.20 | 0.64 | 11.87 | 1 | 0.001 | 9.02 | (2.57–31.64) |
| Disability | 1.48 | 0.45 | 10.95 | 1 | 0.001 | 4.38 | (1.82–10.61) |
| Hemodynamic instability | -0.92 | 0.43 | 4.48 | 1 | 0.03 | 0.40 | (0.17–0.93) |
Final model statistics: χ2 (5) = 40.02, p < 0.001, Cox and Snell R2 = 0.13, and Nagelkerke R2 = 0.20; EMS = emergency medical services.