Table 2.

Observed incidence rates (per 1000 person-years) for recorded AF during the period 2004–2018, stratified by age and gender

	Incidence rate	95% CI	P value*
All patients	4.52	4.49 to 4.55
Gender			<0.001
Female	4.12	4.08 to 4.16
Male	4.95	4.91 to 4.99
Age group			<0.001
40–54	0.58	0.56 to 0.59
55–64	2.36	2.32 to 2.40
65–74	6.84	6.76 to 6.93
75–84	15.5	15.3 to 15.7
85+	21.7	21.4 to 22.0
Gender and age group			<0.001
Women			<0.001
40–54	0.32	0.30 to 0.34
55–64	1.52	1.48 to 1.57
65–74	5.24	5.14 to 5.34
75–84	13.7	13.5 to 13.9
85+	20.3	20.0 to 20.7
Men			<0.001
40–54	0.83	0.80 to 0.85
55–64	3.20	3.14 to 3.27
65–74	8.61	8.48 to 8.75
75–84	18.0	17.7 to 18.3
85+	24.8	24.2 to 25.3

*The p values presented in this table come from unadjusted tests of whether there is variation by age and sex (overall, top two sets of rows) and variation by age, stratified by sex (below, bottom two sets of rows). The interaction p value, however, has a slightly different interpretation and presents a measure of the strength of evidence of whether the effect of age is different for men and women (middle row).

AF, atrial fibrillation.