TABLE A8.

Subset analysis of 33 EDs, pooled monthly visit counts, and incident rate ratios of all pediatric mental health visits

	2019	2020	IRR (95% CI)	2021	IRR (95% CI)
January	615	658	1.07 (0.96–1.19)	523	0.85 (0.76–0.96)
February	610	687	1.13 (1.01–1.26)	534	0.88 (0.78–0.98)
March	738	528	0.72 (0.64–0.80)	638	0.86 (0.78–0.96)
April	711	300	0.42 (0.37–0.48)	642	0.90 (0.81–1.00)
May	703	405	0.58 (0.51–0.65)	649	0.92 (0.83–1.03)
June	493	374	0.76 (0.66–0.87)	507	1.03 (0.91–1.16)
July	517	498	0.96 (0.85–1.09)	405	0.78 (0.69–0.89)
August	590	471	0.80 (0.71–0.90)	463	0.78 (0.70–0.89)
September	754	622	0.82 (0.74–0.92)	716	0.95 (0.86–1.05)
October	769	666	0.87 (0.78–0.96)	605	0.79 (0.71–0.87)
November	700	570	0.81 (0.73–0.91)	657	0.94 (0.84–1.04)
December	587	534	0.91 (0.81–1.02)	560	0.95 (0.85–1.07)

Note: Table reports pooled visit counts across 33 EDs in the Clinical Emergency Data Registry in 2020 and 2021. IRRs are reported against 2019 reference for the corresponding month. For example, the incident rate of pediatric mental health visits in February 2020 was 1.13 (687 visits) as compared to February 2019 (610 visits). CIs are adjusted for clustering within EDs.

Abbreviations: CI, confidence interval; EDs, emergency departments; IRR, incident rate ratio; LOS, length of stay.