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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