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
% 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 |