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Table 2 S. mansoni prevalence at sentinel sites in 2009 and 2012 in Sierra Leone

From: Schistosoma mansoni infection after three years of mass drug administration in Sierra Leone

  2009 2012 Change (%)
Number examined Prevalence (%) (95% CI) Number examined Prevalence (%) (95% CI)
Overall 770 49.7 (46.2 - 53.3) 1290 16.3 (14.4 - 18.4) −67.2
By district      
  Bo 119 25.2 (18.3 - 33.7) 198 0.5 (0.1 - 2.8) −98.0
  Bombali 142 27.5 (20.8 - 35.3) 239 17.6 (13.3 - 22.9) −36.0
  Kailahun 90 60.0 (49.7 - 69.5) 149 16.8 (11.6 - 23.6) −72.0
  Kenema 119 60.5 (51.5 - 68.8) 199 17.1 (12.5 - 22.9) −71.7
  Koinadugu 60 83.3 (72.0 - 90.7) 100 36.0 (27.3 -45.8) −56.8
  Kono 60 65.0 (52.4 - 75.8) 101 20.8 (14.0 - 29.7) −68.0
  Tonkolili 180 35.0 (28.4 - 42.2) 304 12.2 (9.0 - 16.3) −65.1
By baseline endemicity     
  Low 118 4.1 (1.3 - 10.7) 201 8.7 (4.7 - 14.3)* 112.2
  Moderate 294 24.7 (19.8 - 30.0) 498 7.4 (5.3 - 10.1) −70.0
  High 358 74.5 (70.1 - 78.4) 591 23.6 (20.6 - 26.9) −68.3
By sex      
  Boys 373 52.8 (47.7 - 57.8) 645 17.0 (14.2 - 20.0) −67.8
  Girls 396 46.7 (41.7 - 51.5) 644 15.7 (13.1 - 18.7) −66.4
  1. *Change in prevalence in this group is not statistically significant (p = 0.109).