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Loss of disinfection effectiveness as a function of microbial load: trend of proportions.
| Pre-Disinfection Quartiles * (a) |
No. of Positive Plates ** (b) |
Proportion (b/a) |
Chi-Squared for Trend |
p-Value |
|---|---|---|---|---|
| 1st (n. = 82) | 4 | 0.049 | 16.801 | 0.0000 |
| 2nd (n. = 83) | 10 | 0.120 | ||
| 3rd (n. = 82) | 13 | 0.159 | ||
| 4th (n. = 83) | 23 | 0.277 |
* Pre-disinfection skin microbial load ordered into quartiles (83 observations per quartile). ** at least 1 CFU/plate post-disinfection.
