Number of cases where an organism was grown, the median values, interquartile range, and range of colony forming units detected in those cases
| Group A, mask worn | Group B, no mask worn | |||||
|---|---|---|---|---|---|---|
| Organism grown | Number of cases | Median CFU (interquartile range) | Range of CFU | Number of cases | Median CFU (interquartile range) | Range of CFU |
| Coliform spp | 28 | 1 (1, 2) | 1–9 | 18 | 1 (1, 2.25) | 1–14 |
| Staph aureus | 11 | 2 (1, 5) | 1–6 | 26 | 2 (1, 3) | 1–6 |
| S epi/Bacillus/Diphth | 105 | 4 (2, 8) | 0–63 | 110 | 6.5 (4, 14.25) | 1–68 |
| Pseudomonas spp | 6 | 1.5 (1, 9) | 1–30 | 7 | 1 (1, 2) | 1–6 |
| Streptococcus spp | 9 | 1 (1, 5.5) | 1–10 | 15 | 1 (1, 4) | 1–15 |