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Table 4 Sources of variability in repeated KK screening measurements for Ascaris lumbricoides. All variables are described in detail in Additional file 1: Table S1

From: Sources of variability in the measurement of Ascaris lumbricoides infection intensity by Kato-Katz and qPCR

  % variance explained AIC when item excluded, relative to 1742 Chi-square value (all with 1 degree of freedom) and P-value for comparison to full model
Stool donor 54.5 1883 χ 2 = 143, P < 0.0001****
Worms expelled from donor 39.1 1738 χ 2 = 0, P = 1
Slide reader 1.4 1756 χ 2 = 16, P < 0.0001****
Day 0 1740 χ 2 = 0, P = 1
Slide quality 0 1740 χ 2 = 0, P = 1
Time 0 1740 χ 2 = 0, P = 1
Sample ID 4.9   
  1. Abbreviation: AIC Akaike information criterion
  2. *P ≤ 0.05; **P ≤ 0.01; ***P ≤ 0.001; ****P ≤ 0.0001