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Table 2 Summary of sample characteristics by study year for all individuals examined (5–8 years-old, 9–12 years-old, and adults)

From: Evaluating the impact of biannual school-based and community-wide treatment on urogenital schistosomiasis in Niger

Cross-section Variable Baseline (2011) Year 2 (2012) Year 3 (2013) Year 4 (2014) Year 5 (2015)
5−8 years No. of individuals sampled 20,220     22,364
Proportion female (%) 9328 (46.1)     10,227 (45.8)
No. infected with S. haematobium (%) 3474 (17.2)     2134 (9.54)
No. with heavy intensity of infection (%) 391 (1.93)     239 (1.07)
Arithmetic mean egg counta 1.08     0.62
9–12 years No. of individuals sampled 20,931 21,833 21,620 21,715 22,132
Proportion female (%) 9438 (45.1) 9697 (44.4) 9771 (45.2) 9943 (45.8) 10,281 46.5)
No. infected with S. haematobium (%) 3314 (15.8) 2089 (9.57) 3809 (17.6) 1794 (8.26) 2190 (9.89)
No. with heavy intensity of infection (%) 276 (1.32) 99 (0.45) 292 (1.35) 146 (0.67) 146 (0.66)
Arithmetic mean egg counta 3.05 1.27 3.27 1.42 1.45
Adults (20–55 years) No. of individuals sampled 7041     9,955
Proportion female (%) 3966 (56.3)     4789 (48.1)
No. infected with S. haematobium (%) 793 (11.3)     493 (4.95)
No. with heavy intensity of infection (%) 35 (0.50)     28 (0.28)
Arithmetic mean egg counta 4.61     2.05
  1. aThe mean egg count among all tested subjects (including those with zero egg counts), which is a measure of community level contamination potential