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Table 1 Formula to calculate the time to quantify soil-transmitted helminth and Schistosoma mansoni eggs in stool based

From: Comparison of individual and pooled stool samples for the assessment of intensity of Schistosoma mansoni and soil-transmitted helminth infections using the Kato-Katz technique

  Individual samples (n = 360) Pooled samples
Pool size of 5 (n = 72) Pool size of 10 (n = 36) Pool size of 20 (n = 18)
Pooling stool samples _ 72 x mean time to make one pool of 5 72 x mean time to make one pool of 5 + 36 x mean time to make one pool of 10 72 x mean time to make one pool of 5 + 36 x mean time to make one pool of 10 + 18 x mean time to make one pool of 20
Preparing of KK smears +36 x mean time to prepare 10 KK thick smears + 7.2. x mean time to prepare 10 KK thick smears + 3.6 x mean time to prepare 10 KK thick smears + 1.8 x mean time to prepare 10 KK thick smears
Examining of KK smears + Total time required to examine 360 KK thick smears of 360 individual stool samples + Total time required to examine 72 KK thick smears of 72 pools of 5 + Total time required to examine 36 KK thick smears of 36 pools of 10 + Total time required to examine 18 KK thick smears of 18 pools
  1. KK Kato-Katz