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Table 3 Incidence rates of pregnancy by age at conception

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

  Total at risk Number of new pregnancies Pregnancies per 1000 women Number of person years of follow up Incidence rate per 1000 woman years (95% CI)
Overall 8024a 448 55.8 20,466.4 21.9 (20.0, 24.0)
Age at conception
 < 15 4563 15 3.3 11,740.8 1.3 (0.8, 2.2)
 15 2202 28 12.7 1901.6 14.7 (10.1, 21.3)
 16 1984 42 21.2 1608.8 26.1 (19.3, 35.3)
 17 2017 66 32.7 1502.9 43.9 (34.5, 55.9)
 18 2220 127 57.2 1450.7 87.5 (73.5, 104.1)
 19 2824 170 60.2 2261.6 64.7(64.7, 87.4)
  1. a541 adolescents who were pregnant at study entry did not contribute any time at risk as they did not have any follow up within the care program after delivery