Table 1.
Incidence rate ratios (IRR) of number of unprotected vaginal intercourse partners in 12 months by sex
| Male | Female | |||
|---|---|---|---|---|
| IRR | (95% CI) | IRR | (95% CI) | |
| Model 1: income | ||||
| <$5,000 | 1.00 | 1.00 | ||
| $5,000–9,999 | 1.02 | (0.58, 1.79) | 0.71 | (0.47, 1.06) |
| $10,000–14,999 | 0.71 | (0.42, 1.21) | 0.96 | (0.60, 1.54) |
| $15,000–29,999 | 0.52** | (0.32, 0.86) | 0.70 | (0.43, 1.13) |
| $30,000 or over | 1.09 | (0.66, 1.78) | 0.96 | (0.55, 1.67) |
| AIC | 731 | 1,362 | ||
| Model 2: per capita income | ||||
| Log income per capita | 0.97 | (0.82, 1.14) | 0.90 | (0.76, 1.06) |
| AIC | 734 | 1,360 | ||
| Model 3: employment | ||||
| Employed (ref) | 1.00 | 1.00 | ||
| Unemployed | 1.43 | (0.98, 2.09) | 1.32 | (0.94, 1.87) |
| Other | 2.00* | (1.10, 3.65) | 1.91* | (1.18, 3.08) |
| AIC | 739 | 1,363 | ||
All models adjusted for age, marital status and residence in designated high risk area
AIC Akaike information criterion measure of model fit
* P < .05, ** P < .01