Table 2.
Factors Associated With Positivity for Anti-C. trachomatis Pgp3 IgG
| ELISA | MBA | |||
|---|---|---|---|---|
| Characteristics | PR (95% CI) | adjPRa (95% CI) | PR (95% CI) | adjPRa (95% CI) |
| Age | ||||
| 18–24 | 1 | 1 | 1 | 1 |
| 25–29 | 1.1 (0.8–1.4) | 1.0 (0.8–1.2) | 1.0 (0.8–1.3) | 0.8 (0.7–1.0) |
| 30–34 | 1.1 (1.0–1.4) | 1.0 (0.9–1.2) | 1.1 (0.8–1.4) | 0.9 (0.7–1.2) |
| 35–39 | 1.2 (1.0–1.5) | 1.1 (0.9–1.4) | 1.2 (0.9–1.5) | 1.0 (0.8–1.2) |
| Race/ethnicity | ||||
| Non-Hispanic White | 1 | 1 | 1 | 1 |
| Non-Hispanic Black | 2.6 (2.1–3.3) | 2.4 (1.8–3.1) | 3.2 (2.7–3.8) | 2.7 (2.3–3.3) |
| Mexican American | 1.4 (1.1–1.8) | 1.5 (1.2–2.1) | 1.4 (1.1–1.8) | 1.5 (1.2–1.9) |
| Other Hispanic | 1.5 (1.2–2.0) | 1.8 (1.3–2.5) | 1.6 (1.3–2.1) | 1.9 (1.4–2.5) |
| Non-Hispanic Asian | 0.7 (0.5–1.1) | 1.0 (0.6–1.5) | 0.7 (0.5–1.1) | 1.1 (0.7–1.7) |
| Other race, including multiracial | 1.9 (1.3–2.8) | 1.6 (1.0–2.6) | 1.7 (1.1–2.6) | 1.3 (0.9–2.0) |
| Born in the 50 US states | ||||
| No | 1 | 1 | 1 | 1 |
| Yes | 0.9 (0.8–1.2) | 0.9 (0.7–1.2) | 0.9 (0.7–1.1) | 1.0 (0.8–1.2) |
| Poverty | ||||
| Below the poverty level | 1 | 1 | 1 | 1 |
| At or above poverty level | 0.8 (0.7–0.9) | 0.9 (0.8–1.0) | 0.7 (0.6–0.8) | 0.9 (0.8–1.0) |
| Education | ||||
| Less than high school | 1 | 1 | 1 | 1 |
| GED/high school degree/some college | 0.8 (0.7–0.9) | 0.8 (0.7–1.0) | 0.7 (0.6–0.8) | 0.7 (0.6–0.9) |
| College degree of higher | 0.9 (0.8–1.1) | 1.0 (0.8–1.2) | 1.0 (0.8–1.1) | 1.0 (0.8–1.2) |
| Marital status | ||||
| Never married | 1 | 1 | 1 | 1 |
| Married/living with partner | 0.7 (0.6–0.9) | 0.9 (0.7–1.1) | 0.8 (0.6–0.9) | 1.1 (0.9–1.3) |
| Widowed/divorced/separated | 1.4 (1.1–1.8) | 1.1 (0.9–1.5) | 1.3 (1.1–1.7) | 1.1 (0.8–1.5) |
| Not askedb | 0.7 (0.5–0.9) | 0.9 (0.7–1.3) | 0.6 (0.4–0.8) | 0.9 (0.6–1.2) |
| Lifetime sexual partners | ||||
| 0–1 | 1 | 1 | 1 | 1 |
| 2–3 | 2.1 (1.3–3.4) | 1.9 (1.2–3.1) | 2.5 (1.6–3.9) | 2.2 (1.5–3.3) |
| 4–7 | 3.3 (2.3–4.8) | 2.8 (1.9–4.1) | 5.5 (3.8–7.8) | 5.0 (3.5–7.1) |
| 8–15 | 3.3 (2.3–4.7) | 3.0 (2.1–4.5) | 5.2 (3.5–7.6) | 5.4 (3.7–7.9) |
| >15 | 3.8 (2.5–6.0) | 3.6 (2.2–6.0) | 6.3 (4.3–9.5) | 6.9 (4.7–10.3) |
| Sexual partner over past 12 mo | ||||
| 0 | 1 | - | 1 | - |
| 1 | 1.5 (0.9–2.4) | - | 1.9 (1.3–2.9) | - |
| 2 | 2.1 (1.4–3.2) | - | 2.8 (1.8–4.3) | - |
| New sexual partner over past 12 mo | ||||
| No | 1 | 1 | 1 | 1 |
| Yes | 1.2 (1.0–1.5) | 0.9 (0.7–1.1) | 1.3 (1.0–1.5) | 0.9 (0.7–1.1) |
| Age of sexual debut, yc | ||||
| ≤16 | 1 | 1 | 1 | 1 |
| 17–18 | 0.6 (0.5–0.8) | 0.7 (0.5–0.9) | 0.6 (0.5–0.7) | 0.8 (0.7–0.9) |
| ≥19 | 0.3 (0.2–0.4) | 0.5 (0.4–0.7) | 0.2 (0.2–0.3) | 0.4 (0.2–0.6) |
All data are weighted using pooled Medical Examination Center (MEC) survey weights provided by the National Center for Health Statistics. Prevalence ratios were estimated by Poisson regression. Boldface indicate significant association, where the 95% confidence interval does not cross the null value of 1.0.
Abbreviations: adjPR, adjusted prevalence ratio; CI, confidence interval; ELISA, enzyme-linked immunosorbent assay; IgG, immunoglobin G; MBA, multiplex bead format assay; Pgp3, plasmid gene product 3; PR, prevalence ratio; US, United States.
aMultivariable model includes age, race, place of birth, poverty status, education, marital status, lifetime sexual partners, and a new sexual partner over the past 12 months. Multivariable model for age of sexual debut was a separate model that included an additional covariate for age of sexual debut.
bNot asked of participants ages 18 to 19 years.
cOnly among those sexually experienced.