Increasing incidence of rotator cuff surgery: A nationwide registry study in Chile

Table 1 Comparison of incidence rate between groups.

Variables		IRR	Std. Err.	CI 95%	p-value
Incidence rates by year
	2008 (reference) 2018	1.08	0.01	1.07 - 1.09	<0.001
Incidence rates by sex
	Male (reference) Female	1.11	0.01	1.09 - 1.13	<0.001
Incidence rates by age
	25-44 (reference) 45-64	6.71	0.11	6.49 - 6.95	<0.001
	65-74	5.89	0.13	5.65 - 6.14	<0.001
	>75	1.65	0.06	1.54 - 1.77	<0.001
Incidence rates by health insurance
	Public (reference) Private	3.42	0.44	2.66 - 4.39	<0.001

Negative binomial regression was used for the individual analysis of each variable.
Abbreviations used IRR: incidence rate ratio, Std. Err: standard error, CI: confidence interval.

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