Table 2.
Interrupted time series analysis results on PED attendance rates.
| Variable | IRR | 95%CI | p-value |
|---|---|---|---|
| Level changea | |||
| SC vs. PC | 0.17 | 0.12–0.27 | <0.001 |
| MM vs. PC | 0.38 | 0.31–0.47 | <0.001 |
| MM vs. SC | 2.19 | 1.40–3.43 | 0.001 |
| Slope changeb | |||
| SC vs. PC | 1.23 | 1.13–1.33 | <0.001 |
| MM vs. PC | 1.05 | 1.03–1.07 | <0.001 |
| MM vs. SC | 0.86 | 0.79–0.93 | <0.001 |
| Time trendc | 1.00 | 0.99–1.01 | 0.792 |
| Season | |||
| Summer | 1.00 | ||
| Winter | 1.04 | 0.93–1.16 | 0.510 |
| Spring | 1.14 | 1.02–1.27 | 0.022 |
| Autumn | 1.07 | 0.96–1.19 | 0.218 |
a Level change refers to an abrupt level change of the Incidence rate between the phases; b Slope change refers to slope change of the incidence rate over time between the phases; c Time trend refers to the change of Incidence rate associated with a time unit increase. PED, Pediatric Emergency Department; IRR, incidence rate ratio; PC, pre-COVID19 phase; SC, School closure phase; MM, Mitigation measures phase; 95%CI, 95% confidence interval. Pseudo R2 = 0.85. MM vs. SC contrast was manually added for interpretative purposes without p-value adjustment for multiple comparison.