Event rates in exposed and unexposed groups
| Median rate in rooms (events/dispenser/h) | IQR of rooms (events/dispenser/h) | Wilcoxon signed rank* | Median rate in halls (events/dispenser/h) | IQR of halls (events/dispenser/h) | Wilcoxon signed rank* | Median overall rate (events/dispenser/h) | IQR overall (events/dispenser/h) | Wilcoxon signed rank* | |
|---|---|---|---|---|---|---|---|---|---|
| Exposed | 0 | 0–0.48 | – | 3.75 | 2.23–5.45 | – | 1.43 | 0.79–2.41 | – |
| Unexposed location | 0 | 0–0.61 | Z=−0.13 (p=0.90) | 1.48 | 0.46–2.79 | Z=−3.39 (p=0.001) | 0.67 | 0.29–1.58 | Z=−2.65 (p=0.008) |
| Unexposed 1 week prior | 0 | 0–0.50 | Z=−0.04 (p=0.97) | 1.07 | 0.37–2.45 | Z=−4.53 (p<0.001) | 0.58 | 0.27–1.01 | Z=−3.70 (p<0.001) |
| Unexposed 2 weeks prior | 0 | 0–0.51 | Z=−0.30 (p=0.77) | 1.5 | 0.65–2.30 | Z=−4.13 (p<0.001) | 0.63 | 0.29–0.94 | Z=−4.04 (p<0.001) |
| Unexposed 3 weeks prior | 0 | 0–0.78 | Z=−0.63 (p=0.53) | 1.25 | 0.38–2.22 | Z=−4.45 (p<0.001) | 0.65 | 0.32–1.17 | Z=−3.70 (p<0.001) |
| Unexposed prior to auditor | 0 | 0–0 | Z=−1.76 (p=0.08) | 1.5 | 0–5.00 | Z=−2.60 (p=0.009) | 0.6 | 0–1.67 | Z= −3.00 (p=0.003) |
*Compared with exposed group.
IQR, interquartile range.