Diagnostic accuracy of duplicate Kato-Katz thick smears and the FLOTAC basic technique at follow-up.

Prevalence, quartiles, arithmetic mean and geometric mean eggs per gram of stool (EPG), and sensitivity with 95% confidence intervals (CI), as determined from stool samples examined with duplicate Kato-Katz thick smears and the FLOTAC basic technique at follow-up in 269 school children from Kinyasini and Kilombero primary schools, Zanzibar, in May 2009. The diagnostic ‘gold’ standard was derived by the combined results of duplicate Kato-Katz thick smears and the FLOTAC basic technique.aDifferences in sensitivities determined by the McNemar test on positive individuals: P = 0.030.bκ measure of agreement taking into account positive and negative individuals: κ = 0.73.cDifferences in sensitivities determined by the McNemar test on positive individuals: P = 0.201.dκ measure of agreement taking into account positive and negative individuals: κ = 0.50.eBinomial exact 95% confidence intervals.fDifferences in sensitivities determined by the McNemar test on positive individuals: P = 0.417.gκ measure of agreement taking into account positive and negative individuals: κ = 0.49.