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Table 4 Effect of anthelminthic treatment on mean haemoglobin level (g/l) and prevalence of anaemia (%) among school children in Tikur Wuha Elementary School, northwestern Ethiopia, 2011

From: Effect of anthelminthic treatment on helminth infection and related anaemia among school-age children in northwestern Ethiopia

Parameters Number examined Before treatment After treatment Mean haemoglobin increase/percent anaemia decrease P*-value
Mean haemoglobin 235 127.2 130.8 3.7 <0.01
 Age in years
  5–10 80 125.1 127.2 2.1 <0.01
  11–15 155 128.2 132.7 4.5 <0.01
  P**-value     0.031  
 Sex
  Female 120 126.0 129.7 3.7 <0.01
  Male 115 128.3 132.0 3.7 <0.01
  P**-value     0.975  
 Infection
  Hookworm 189 126.8 130.7 3.8 <0.01
  S. mansoni 99 125.9 128.5 2.6 <0.01
  A. lumbricoides 17 124.2 125.4 1.2 0.507
  T. trichiura   130.3 130.9 0.6 0.386
  Single 160 128.7 133.0 4.3 <0.01
  Multiple 75 124.0 126.2 2.3 0.01
 Nutrition
  Normal 215 129.1 131.3 2.2 <0.01
  Undernourished 188 125.1 130.3 5.2 <0.01
  P**-value     <0.01  
Prevalence of anaemia 235 21.3 16.1 25.4 0.148
 Age in years
  5–10 80 13.8 11.3 18.1 0.633
  11–15 155 25.5 18.3 28.2 0.125
  P**-value     0.089  
 Sex
  Female 120 25.8 17.5 32.2 0.119
  Male 115 16.8 14.2 15.5 0.586
  P**-value     <0.01  
 Infection status
  Hookworm 189 21.7 14.3 34.1 0.061
  S. mansoni 99 26.3 24.2 8.0 0.744
  A. lumbricoides 17 17.7 17.7 0.0 1.00
  T. trichiura 7 14.3 14.3 0.0 1.00
  Single 160 17.5 13.2 24.6 0.286
  Multiple 75 29.3 22.7 22.5 0.357
 Nutrition status
  Normal 215 19.7 16.2 17.8 0.487
  Undernourished 188 18.5 15.9 14.1 0.248
  P**-value     0.359  
  1. p-values*: based on paired t-test (mean haemoglobin differences between before and post treatment) and z-test of proportion (changes in the prevalence of anaemia before and post treatment)
  2. p-values**: based on unpaired t-test (compared the magnitude of changes in haemoglobin level between two groups) and z-test of proportion (compared the magnitude of changes in the prevalence of anaemia between two groups)