Skip to main content

Table 5 Unadjusted and adjusted hazard ratios (HR) and 95% confidence intervals (CI) of incident pregnancy among the 8024 adolescents

From: Decreasing incidence of pregnancy among HIV-positive adolescents in a large HIV treatment program in western Kenya between 2005 and 2017: a retrospective cohort study

Variable Unadjusted HR (95% CI) Adjusted HR (95% CI)
Age at enrollment (years) 1.75 (1.66, 1.84) 1.34 (1.26, 1.43)
Married or living with a partner
 Yes vs. no 3.19 (2.56, 3.99) 1.35 (1.05, 1.73)
Had sex within 6 months prior to enrollment
 Yes vs. no 2.28 (1.77, 2.93) 1.26 (0.96, 1.64)
Had sex outside of marriage
 Yes vs. no 1.93 (1.28, 2.91) 1.36 (0.90, 2.07)
Urban clinic location
 Yes vs. no 0.90 (0.75, 1.08) 0.97 (0.80, 1.17)
Pregnant at the time of inclusion in the study
 Yes vs. no 6.05 (4.68, 7.82) 1.12 (0.85, 1.47)
Had at least one child at enrollment
 Yes vs. no 4.87 (3.79, 6.25) 2.01 (1.54, 2.62)
HIV status disclosed at enrollment
 Yes vs. no 4.94 (3.86, 6.31) 1.33 (1.02, 1.73)
Hospitalized in the year prior to enrollment
 Yes vs. no 0.50 (0.33, 0.77) 0.71 (0.46, 1.09)
aCD4 cell count per mm3
 > 350 vs. ≤ 350 1.56 (1.15, 2.12) 1.26 (0.91, 1.74)
b BMI (kg/m2)
 18.5–25 vs. ≤ 18.5 4.94 (2.99, 8.19) 1.88 (1.12, 3.13)
 > 25 vs. < 18.5 2.56 (1.01, 6.45) 0.72 (0.28, 1.84)
b Hemoglobin (g/dL)   
 > 11 vs. ≤ 11.0 2.14 (1.13, 4.08) 1.54 (0.80, 2.95)
bWHO clinical stage
 2 vs. 1 0.61 (0.45, 0.81) 0.87 (0.64, 1.18)
 3 vs. 1 0.40 (0.30, 0.54) 0.71 (0.52, 0.98)
 4 vs. 1 0.18 (0.08, 0.45) 0.33 (0.13, 0.81)
Family planning use
 Yes vs. no 2.48 (1.93, 3.18) 0.75 (0.57, 0.97)
  1. HR hazard ratio, CL confidence limits
  2. aClose to conception data (6 months pre- and 1 month post- for those who became pregnant, and 6 months before last visit for those who were not pregnant)
  3. bClose to conception data (3 months pre- and 1 month post- for those who became pregnant, and 3 months before last visit for those who were not pregnant)