Table 1 Demographic characteristics of the study population in Western and Central Kenya
|  | Western Kenya n=306 | Central Kenya n = 410 | ||||||
|---|---|---|---|---|---|---|---|---|
Pre-vaccine, n = 153 | Post-vaccine n = 153 | Pre-vaccine n = 205 | Post-vaccine n = 205 | |||||
Prevalence | 95% C.I | Prevalence | 95% C.I | Prevalence | 95% C.I | Prevalence | 95% C.I | |
Male | 86 (56.3%) | 48.3–63.9 | 91 (59.5%) | 51.6–67.0 | 116 (56.6%) | 49.7–63.3 | 107 (52.2%) | 45.4–59.0 |
Female | 67 (43.8%) | 36.1–51.8 | 62 (40.5%) | 33.0–48.5 | 89 (43.4%) | 36.7–50.2 | 98 (47.8%) | 41.0–54.6 |
Age in months | ||||||||
 0–2 | 0 (0.0%) | 0.0–2.0 | 2 (1.3%) | 0.2–4.3 | 1 (0.5%) | 0.0–2.4 | 4 (2.0%) | 0.6–4.6 |
 3–5 | 17 (11.1%) | 6.8–16.6 | 26 (17.0%) | 11.7–23.6 | 10 (4.9%) | 2.5–8.5 | 15 (7.3%) | 4.3–11.5 |
 6–8 | 24 (15.7%) | 10.6–22.1 | 15 (9.8%) | 5.8–15.3 | 58 (28.3%) | 22.5–34.6 | 43 (21.0%) | 15.8–27.0 |
 9–11 | 15 (9.8%) | 5.8–15.3 | 23 (15.0%) | 10.0–21.4 | 41 (20.0%) | 15.0–25.9 | 26 (12.7%) | 8.6–17.8 |
 12–23 | 45 (29.4%) | 22.6–37.0 | 45 (29.4%) | 22.6–37.0 | 60 (29.3%) | 23.4–35.8 | 76 (37.1%) | 30.6–43.9 |
 24–59 | 52 (34.0%) | 26.3–41.8 | 42 (27.5%) | 20.8–34.9 | 35 (17.1%) | 12.4–22.7 | 41 (20.0%) | 15.0–25.9 |