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Table 3 Overall prevalence (P, %), mean intensity (epg), relative reductions % (Wald test: Z-statistic, P-value) and absolute reductions % (Wald test: Z-statistic, P-value) of STHs: Baseline and mid-term

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

Infection Y1 baseline Y3 mid-term PRR % ARP %
Prevalence P % (95 % CI) P% (95 % CI) (Z-statistic, P-value) (Z-statistic, P-value)
STH combined 32.3 (30.0–34.8) 16.4 (14.4–18.6) 49.3 (Z = -13.69, P < 0.001) 15.9 (Z = -16.95, P < 0.001)
Hookworms 15.4 (13.6–17.6) 2.3 (1.8–3.0) 85.0 (Z = -14.65, P < 0.001) 13.1 (Z = -13.92, P < 0.001)
A. lumbricoides 18.1 (15.8–20.7) 11.9 (10.2–13.9) 34.0 (Z = -8.81, P < 0.001) 6.1 (Z = -8.15, P < 0.001)
T. trichiura 6.7 (5.4–8.2) 4.5 (3.4–6.0) 32.3 (Z = -3.91, P < 0.001) 2.1 (Z = -4.36, P < 0.001)
Mean intensity epg (95 % CI) epg (95 % CI) IRR % (Z-statistic, P-value)  
Hookworms 63 (50–81) 8 (5–14) 87.1 (Z = -6.60, P < 0.001)
A. lumbricoides 1659 (1378–1998) 960 (801–1151) 42.1 (Z = -7.98, P < 0.001)
T. trichiura 33 (11–105) 17 (11–26) 49.5 (Z = -1.11, P = 0.267)
  1. Abbreviations: PRR relative reduction in prevalence, IRR relative reduction in mean intensity, ARP absolute reduction in prevalence