Incidence of immune-mediated inflammatory diseases following COVID-19: a matched cohort study in UK primary care

Table 2 Incidence rates and HRs for the composite outcome

Outcome	Exposed cohort (n = 458,147)	Unexposed cohort (n = 1,818,929)
Outcome events, no. (%)	696 (0.15)	2230 (0.12)
Person-years of follow-up	151,569	611,211
Crude incidence rate per 1000 person-years	4.59	3.65
Median follow-up, years (IQR)	0.29 (0.24–0.42)	0.29 (0.24–0.42)
Crude HR (95% CI)	1.26 (1.16–1.37)
Adjusted^a HR (95% CI)	1.22 (1.12–1.33)

CI confidence interval, HR hazard ratio, IQR interquartile range
^aAdjusted for age, sex, BMI, ethnicity, smoking status, selected viral infections, and selected medications

ISSN: 1741-7015