Table 3.

IRRs and 95% CIs of interactions between IADL, IA, SR, or TMIG-IC and a family physician on non-receipt of vaccinations.

	Number of incapable tasks/activities	Home physician	Influenza vaccination	Pneumococcal vaccination	Neither of the two vaccinations
	0	No	1.00 (Reference)	1.00 (Reference)	1.00 (Reference)
IADL	0	Yes	0.73 (0.71–0.76)	0.92 (0.89–0.95)	0.58 (0.56–0.61)
	1*	Yes	0.68 (0.63–0.74)	0.97 (0.90–1.04)	0.59 (0.53–0.67)
	2**	Yes	0.79 (0.70–0.88)	1.07 (0.98–1.17)	0.72 (0.62–0.84)
IA	0	Yes	0.72 (0.69–0.75)	0.91 (0.88–0.95)	0.57 (0.54–0.61)
	1	Yes	0.76 (0.72–0.80)	0.95 (0.90–0.99)	0.63 (0.59–0.68)
	2	Yes	0.78 (0.73–0.83)	0.99 (0.94–1.05)	0.70 (0.64–0.76)
SR	0	Yes	0.74 (0.70–0.77)	0.90 (0.85–0.94)	0.59 (0.54–0.63)
	1	Yes	0.79 (0.75–0.83)	0.89 (0.85–0.94)	0.62 (0.57–0.67)
	2	Yes	0.83 (0.79–0.88)	0.94 (0.89–0.99)	0.69 (0.63–0.74)
TMIG-IC	0	Yes	0.74 (0.69–0.78)	0.89 (0.84–0.95)	0.58 (0.53–0.63)
	1	Yes	0.77 (0.72–0.82)	0.90 (0.84–0.95)	0.60 (0.55–0.66)
	2	Yes	0.82 (0.78–0.87)	0.93 (0.88–0.99)	0.68 (0.62–0.73)

IRR incident rate ratio, 95% CI 95% confidence interval, IADL instrumental activity of daily life, IA intellectual activity, SR social role, TMIG-IC Tokyo Metropolitan Institute of Gerontology Index of Competence.

*Incapable of any one task/activity.

**Incapable of any two tasks/activities. The IRRs and 95% CIs were adjusted for age, sex, marital status, educational attainment, equivalized income, household structure, smoking status, self-rated health, medical checkup, family physician, patient’s questioning attitude, high-risk disease, pneumococcal or influenza vaccination (only for non-receipt of influenza or pneumococcal vaccination), history of influenza or pneumonia, geriatric depression, homeboundness, civic participation, social cohesion, and reciprocity.