Syphilis incidence among injection drug users in Los Angeles County, 1994–6
| Demographic characteristics | Cases/total sample | Incidence rate/1000 person years | Rate ratio | 95% CI | p Value |
|---|---|---|---|---|---|
| *See text for definition. | |||||
| Overall incidence | 12/390 | 26.0 | — | 19.4, 32.3 | |
| Sex: | |||||
| Female | 6/106 | 48.1 | 2.7 | 1.60, 4.55 | <0.01 |
| Male | 6/284 | 17.8 | |||
| Age (years) | |||||
| ≤44 | 9/227 | 34.2 | 2.2 | 1.25, 4.08 | <0.01 |
| ≥45 | 3/163 | 15.1 | |||
| Race: | |||||
| African-American | 9/269 | 27.8 | 1.2 | 0.72, 2.23 | >0.05 |
| Latino | 3/121 | 21.8 | |||
| Educational status: | |||||
| ≥ High school | 8/233 | 29.5 | |||
| < High school | 4/157 | 20.8 | 0.7 | 0.40, 1.23 | >0.05 |
| Marital status: | |||||
| Not married | 10/318 | 26.7 | 1.2 | 0.68, 2.08 | >0.05 |
| Married | 2/72 | 22.4 | |||
| Homeless: | |||||
| Yes | 3/183 | 31.6 | 1.2 | 0.75, 2.17 | >0.05 |
| No | 9/306 | 24.6 | |||
| Source of most income:* | |||||
| Illicit sources | 8/105 | 67.3 | 5.7 | 3.30, 9.85 | <0.01 |
| Regular employment | 4/282 | 11.8 | |||