Table 3.
Baseline, midterm and endline prevalence (%) of infection and relative reductions % (Wald test: Z-statistic, P-value) by region among Kenyan school-aged children, 2012–2017
| Baseline | Midterm | Endline | Relative reduction (%) (Baseline – Endline) |
|
|---|---|---|---|---|
| Prevalence % (95% CI) | Prevalence % (95% CI) | Prevalence % (95% CI) | ||
| Coast Region (46 schools) | ||||
| STH combined | 24.2 (19.9–29.4) | 5.4 (3.5–8.4) | 3.0 (2.2–4.1) | 87.6 (Z = -20.24, P < 0.001) |
| Hookworm | 18.2 (14.0–23.5) | 4.2 (2.5–7.0) | 1.6 (1.1–2.3) | 91.2 (Z = -17.47, P<0.001) |
| A. lumbricoides | 1.0 (0.7–1.6) | 0.3 (0.1–0.5) | 0.3 (0.2–0.6) | 70.0 (Z = -26.00, P<0.001) |
| T. trichiura | 7.9 (5.7–10.9) | 1.6 (1.0–2.7) | 1.3 (0.8–2.1) | 83.5 (Z = -18.93, P<0.001) |
| S. mansoni | 0 (0–0.1) | 0 (0–0.2) | 0.1 (0–0.2) | increase |
| S. haematobium | 14.8 (11.3–19.5) | 6.8 (4.3–10.7) | 2.4 (1.3–4.3) | 83.8 (Z = -17.42, P < 0.001) |
| Nyanza Region (64 schools) | ||||
| STH combined | 30.6 (27.0–34.6) | 15.0 (12.1–18.7) | 12.4 (9.8–15.7) | 59.4 (Z = -20.55, P < 0.001) |
| Hookworm | 11.8 (9.8–14.1) | 2.4 (1.6–3.6) | 1.3 (0.8–2.2) | 89.0 (Z = -28.36, P < 0.001) |
| A. lumbricoides | 19.9 (16.0–24.7) | 12.6 (9.7–16.2) | 10.4 (7.9–13.7) | 12.6 (Z = -16.16, P < 0.001) |
| T. trichiura | 3.6 (2.5–5.1) | 1.7 (1.2–2.4) | 1.6 (1.1–2.4) | 55.6 (Z = -22.82, P < 0.001) |
| S. mansoni | 2.8 (1.5–5.0) | 0.8 (0.5–1.2) | 2.3 (1.2–4.5) | 17.9 (Z = -11.89, P < 0.001) |
| S. haematobium | – | – | – | – |
| Rift Valley (34 schools) | ||||
| STH combined | 36.3 (30.4–43.4) | 25.7 (20.8–31.8) | 26.4 (21.2–32.8) | 27.5 (Z = -12.03, P < 0.001) |
| Hookworm | 3.5 (2.1–6.1) | 0.3 (0.2–0.6) | 0.4 (0.2–0.9) | 88.6 (Z = -14.73, P < 0.001) |
| A. lumbricoides | 27.1 (21.9–33.6) | 18.5 (14.6–23.4) | 17.5 (13.4–23.1) | 35.4 (Z = -12.91, P < 0.001) |
| T. trichiura | 11.9 (7.7–18.4) | 11.2 (7.3–17.0) | 11.6 (7.8–17.3) | 2.5 (Z = -10.09, P < 0.001) |
| S. mansoni | 0.4 (0.1–2.5) | 0.4 (01–1.3) | 0.5 (0.2–1.2) | increase |
| S. haematobium | – | – | – | – |
| Western Region (55 schools) | ||||
| STH Combined | 38.6 (34.9–42.7) | 21.2 (17.4–25.9) | 15.2 (11.7–19.6) | 60.6 (Z = -21.46, P < 0.001) |
| Hookworm | 24.8 (21.1–29.2) | 1.9 (1.3–2.7) | 1.6 (1.1–2.2) | 93.5 (Z = -25.39, P < 0.001) |
| A. lumbricoides | 24.6 (20.8–29.1) | 16.9 (13.8–20.6) | 11.1 (8.3–15.2) | 54.9 (Z = -18.21, P < 0.001) |
| T. trichiura | 5.9 (3.9–9.0) | 6.0 (3.5–10.2) | 4.4 (2.6–7.8) | 25.4 (Z = -12.58, P < 0.001) |
| S. mansoni | 4.2 (1.9–9.2) | 4.2 (1.7–10.5) | 3.1 (1.4–6.8) | 26.2 (Z = -8.29, P < 0.001) |
| S. haematobium | – | – | – | – |
–, S. haematobium was not examined in Nyanza, Rift Valley and Western regions