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Table 4 Sensitivity and specificity of the reagent strip method for S. haematobium diagnosis in adults 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 336 146 482
Negative 1688 15,985 17,673
Total 2024 16,131 18,155
Sensitivity of reagent strips   69.7% (65.4–73.8%)   
Specificity of reagent strips   90.4% (90.0–90.9%)   
Subgroup: 1–5 eggs/10 ml   Positive Negative Total
Positive 132 93 225
Negative 1688 15,985 17,673
Total 1820 16,078 17,898
Sensitivity of reagent strips   58.7% (51.9–65.2%)   
Subgroup: 6–10 eggs/10 ml   Positive Negative Total
Positive 46 18 64
Negative 1688 15,985 17,673
Total 1734 16,003 17,737
Sensitivity of reagent strips   71.9% (59.2–82.4%)   
Subgroup: 11–49 eggs/10 ml   Positive Negative Total
Positive 95 27 122
Negative 1688 15,985 17,673
Total 1783 16,012 17,795
Sensitivity of reagent strips   77.9% (69.5–84.9%)   
Subgroup: 50+ eggs/10 ml   Positive Negative Total
Positive 63 8 71
Negative 1688 15,985 17,673
Total 1751 15,993 17,744
Sensitivity   88.7% (79.0–95.0%)