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Table 4 Prevalence of light, moderate and heavy mean intensity of infections [% (95 % CI)] in Y1 and Y3 and relative reductions % (Wald test: Z-statistic, P-value)

From: Monitoring the impact of a national school based deworming programme on soil-transmitted helminths in Kenya: the first three years, 2012 – 2014

  Light Moderate Heavy
STH combined    
 Y1 baseline 23.6 (22.0–25.4) 8.5 (7.2–10.1) 0.2 (0.1–0.5)
 Y3 mid-term 10.6 (9.4–12.0) 5.7 (4.8–6.9) 0 (0–0.1)
 Relative reduction (%) 55.1 (Z = -14.17, P < 0.001) 32.7 (Z = -6.47, P < 0.001) 75.1 (Z = -2.20, P = 0.028)
Hookworms    
 Y1 baseline 15.1 (13.3–17.2) 0.2 (0.1–0.3) 0.1 (0–0.2)
 Y3 mid-term 2.2 (1.7–3.0) 0 (0–0.1) 0 (0–0.1)
 Relative reduction 85.2 (Z = -15.25, P < 0.001) 86.9 (Z = -4.11, P < 0.001) 61.7 (Z = -1.62, P = 0.105)
A. lumbricoides    
 Y1 baseline 9.8 (8.7–11.2) 8.2 (6.9–9.8) naa
 Y3 mid-term 6.5 (5.6–7.5) 5.4 (4.5–6.5) naa
 Relative reduction 34.1 (Z = -6.87, P < 0.001) 33.9 (Z = -6.79, P < 0.001)  
T. trichiura    
 Y1 baseline 6.4 (5.2–7.8) 0.2 (0.1–0.3) 0.1 (0–0.6)
 Y3 mid-term 4.2 (3.1–5.5) 0.3 (0.2–0.6) 0
 Relative reduction 34.6 (Z = -4.56, P < 0.001) Increase (58.4 %) (Z = 1.70, P = 0.088) 94.0 (Z = -1.98, P = 0.047)
  1. a A. lumbricoides egg counts were truncated at 24,000 epg hence their heavy intensity of infection was not measured