Table V.

Mean visits in patients with one or more exacerbations before COVID-19 (2019) vs during COVID-19 (2020) (n = 223)

Use measure	Before COVID-19∗	During COVID-19∗	Difference (mean [95% confidence interval])†	Rate ratio (mean [95% confidence interval])‡
In-person visits	4.11 (0.23)	1.98 (0.17)	–2.13 (–2.57 to –1.70)	0.48 (0.41-0.57)
Virtual visits	0.62 (0.07)	2.75 (0.19)	2.13 (1.75-2.52)	4.46 (3.48-5.70)
Total visits (in-person / virtual visits)	4.73 (0.24)	4.73 (0.29)	0.00 (–0.59 to 0.59)	1.00 (0.88-1.13)

^∗Means are adjusted for person-years; SEs were derived from Poisson regression.

^†Confidence intervals were derived from Poisson regression and nonlinear mixed models.

^‡Confidence intervals were derived from Poisson regression.