Table 1
Regression analysis results using model in (4)
| Covariates | Coefficients | Chlamydia | Gonorrhoea | Syphilis |
|---|---|---|---|---|
| Population |  | 1.039*** | 1.119*** | 1.292*** |
 | (1.008 to 1.070) | (1.054 to 1.184) | (1.212 to 1.372) | |
| African–American |  | 0.01*** | 0.024*** | 0.025*** |
 | (0.009 to 0.011) | (0.022 to 0.026) | (0.022 to 0.028) | |
| Gini |  | 0.645** | 2.312*** | 5.993*** |
 | (0.069 to 1.221) | (0.848 to 3.776) | (4.505 to 7.481) | |
| Education |  | −0.015 | −0.051** | −0.106*** |
 | (−0.035 to 0.005) | (−0.096 to −0.006) | (−0.155 to −0.057) | |
| Insurance |  | – | 0.011*** | – |
 | (0.003 to 0.019) | |||
| Income |  | −0.005** | −0.011*** | 0.014** |
 | (−0.009 to −0.001) | (−0.019 to −0.003) | (0.004 to 0.024) | |
| Intercept |  | −2.125*** | −4.705*** | −8.371*** |
 | (−2.395 to −1.855) | (−5.763 to −3.647) | (−9.081 to −7.661) | |
| Dispersion |  | 12.805 | 3.073*** | 2.181 |
Results include coefficients estimates, their 95% CIs, the p values (**means p<0.05 and ***means p<0.01, with p values testing the null
) and the overdispersion parameter r. A stepwise model selection was carried out using stepAIC algorithm, with ‘–’ indicating that the algorithm excluded the variable from the regression.
