Association of frailty with influenza and hospitalization due to influenza among independent older adults: a longitudinal study of Japan Gerontological Evaluation Study (JAGES)

Table 3 Interactions for frailty and sex in influenza or in the hospitalization (n = 77,103)

	Influenza				Hospitalization due to influenza
	Unadjusted		Adjusted		Unadjusted		Adjusted
	RR	95% CI	RR	95% CI	RR	95% CI	RR	95% CI
Nonfrail female	1.00	Reference	1.00	Reference	1.00	Reference	1.00	Reference
Prefrail male	1.07	0.95 − 1.21	1.08	0.96 − 1.22	0.93	0.42 − 2.03	0.94	0.43 − 2.05
Frail male	1.14	0.90 − 1.43	1.13	0.90 − 1.43	1.08	0.37 − 3.14	1.05	0.36 − 3.04

RR risk ratio, 95% CI 95% confidence interval. RRs and 95% CIs of the interactions were adjusted for sex, frailty, age, marital status, educational attainment, equivalized income, household structure, smoking status, high-risk disease, influenza vaccination, civic participation, reciprocity, and numbers of friends met in the last month, and the municipalities

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