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Table 3 Sensitivity and specificity of the reagent strip method for S. haematobium diagnosis in children when urine filtration results are considered as reference test

From: Urogenital schistosomiasis elimination in Zanzibar: accuracy of urine filtration and haematuria reagent strips for diagnosing light intensity Schistosoma haematobium infections

Reference test: urine filtration Microhaematuria
All individuals included   Positive Negative Total
Positive 1525 605 2130
Negative 1007 36,070 37,077
Total 2532 36,675 39,207
Sensitivity of reagent strips   71.6% (69.6–73.5%)   
Specificity of reagent strips   97.3% (97.1–97.4%)   
Subgroup: 1–5 eggs/10 ml   Positive Negative Total
Positive 371 369 740
Negative 1007 36,070 37,077
Total 1378 36,439 37,817
Sensitivity of reagent strips   50.1% (46.5–53.8%)   
Subgroup: 6–10 eggs/10 ml   Positive Negative Total
Positive 199 85 284
Negative 1007 36,070 37,077
Total 1206 36,155 37,361
Sensitivity of reagent strips   70.1% (64.4–75.3%)   
Subgroup: 11–49 eggs/10 ml   Positive Negative Total
Positive 527 119 646
Negative 1007 36,070 37,077
Total 1534 36,189 37,723
Sensitivity of reagent strips   81.6% (78.4–84.5%)   
Subgroup: 50+ eggs/10 m   Positive Negative Total
Positive 428 32 460
Negative 1007 36,070 37,077
Total 1435 36,102 37,537
Sensitivity of reagent strips   93.0% (90.3–95.2%)