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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

From: Results of a national school-based deworming programme on soil-transmitted helminths infections and schistosomiasis in Kenya: 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
  1. –, S. haematobium was not examined in Nyanza, Rift Valley and Western regions