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Table 6 Absolute increase, % (Wald test: Z-statistic, P-value), in prevalence (PI) and mean intensity of infection (II): Re-infections between different rounds of MDA

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

Infection Y2 pre-MDA vs Y1 post-MDA Y3 pre-MDA vs Y2 post-MDA Y3 pre-MDA vs Y1 post-MDA
STH combined    
 PI (%) 13.9 (Z = -19.40, P < 0.001) 11.1 (Z = -20.80, P < 001) 12.5 (Z = -19.58, P < 0.001)
 II (epg) 616 (Z = 44.18, P < 0.001) 504 (Z = 38.96, P < 001) 524 (Z = 39.20, P < 0.001)
Hookworms    
 PI (%) 3.8 (Z = -17.44, P < 0.001) 2.3 (Z = -16.62, P < 0.001) 2.8 (Z = -18.11, P < 0.001)
 II (epg) 12 (Z = 9.32, P < 0.001) 5 (Z = 5.87, P < 0.001) 7 (Z = 8.13, P < 0.001)
A. lumbrucoides    
 PI (%) 7.4 (Z = -19.63, P < 0.001) 7.2 (Z = -19.18, P < 0.001) 7.5 (Z = -19.19, P < 0.001)
 II (epg) 590 (Z = 41.97, P < 0.001) 493 (Z = 38.26, P < 0.001) 507 (Z = 38.02, P < 0.001)
T. trichiura    
 PI (%) 4.7 (Z = -13.60, P < 0.001) 2.8 (Z = -17.36, P < 0.001) 3.7 (Z = -15.20, P < 0.001)
 II (epg) 13 (Z = 5.61, P < 0.001) 6 (Z = 6.46, P < 0.001) 10 (Z = 5.46, P < 0.001)