TABLE 3

Estimated Visit Rates Per 100 Person-Years for Exposed and Unexposed Children by Age, With Excess Visits Among Exposed Children

Use OutcomeAge Group
3–11 mo (n = 7072), Rate (95% CI)a1–2 y (n = 7771), Rate (95% CI)a3–5 y (n = 10 767), Rate (95% CI)a6–12 y (n = 23 544), Rate (95% CI)a13–17 y (n = 20 511), Rate (95% CI)a
WCC visits
    Exposed204.1 (197.8–210.5)72.0 (68.5–75.6)45.7 (43.4–48.1)24.5 (23.4–25.7)16.5 (15.5–17.6)
    Unexposed210.3 (205.3–215.4)76.1 (73.3–79.0)45.3 (43.4–47.2)24.0 (23.1–24.9)17.2 (16.5–18.0)
Sick visits: primary care departments
    Exposed563.2 (552.8–573.9)331.6 (324.1–339.3)214.4 (209.4–219.5)189.1 (185.9–192.3)214.3 (210.6–218.0)
    Unexposed487.1 (479.5–494.8)277.7 (272.3–283.2)173.6 (170.0–177.4)140.9 (138.7–143.1)157.0 (154.7–159.4)
Specialty department visits
    Exposed39.5 (36.7–42.3)34.8 (32.4–37.3)35.7 (33.7–37.8)64.7 (62.8–66.6)103.3 (101–106)
    Unexposed36.4 (34.3–38.5)28.6 (26.8–30.4)26.2 (24.8–27.7)35.6 (34.5–36.7)59.3 (57.8–60.7)
ED visits
    Exposed50.4 (47.3–53.6)34.1 (31.7–36.7)17.6 (16.2–19.2)14.4 (13.5–15.3)20.9 (19.7–22.0)
    Unexposed41.4 (39.3–43.7)26.4 (24.8–28.2)14.6 (13.6–15.8)10.0 (9.4–10.6)13.5 (12.8–14.2)
Inpatient visits
    Exposed4.5 (3.6–5.5)2.4 (1.7–3.1)1.1 (0.7–1.5)2.3 (1.9–2.6)4.8 (4.3–5.4)
    Unexposed3.7 (3.1–4.4)1.5 (1.1–1.9)1.0 (0.7–1.3)0.7 (0.5–0.9)2.5 (2.2–2.8)
  • CI indicates confidence interval.

  • a Visit rate, in visits per 100 person-years, was derived from univariate conditional Poisson models.