Effect of informal care on health care utilisation for the elderly in urban and rural China: evidence from China health and retirement longitudinal study (CHARLS)

Table 3 Association between informal care and health service utilisation: fixed-effect negative binomial model for panel data

	Inpatient (N = 5704)		Outpatient (N = 5704)
	IRR	Bootstrap standard error	IRR	Bootstrap standard error
Informal care (reference: None)
1-14d	1.022	0.164	1.219	0.255
15-29d	2.082^b	0.664	1.262	0.415
30d or more	1.396^c	0.175	1.374^b	0.189
Gender (reference: male)	0.583	0.202	1.044	0.263
Age	1.042^b	0.020	0.944^c	0.016
Marital status (reference: single)	0.632^b	0.125	1.290	0.234
Education (reference: illiterate)	1.105	0.113	1.038	0.088
Chronic diseases (reference: None)	1.399^c	0.109	1.111	0.085
Smoke (reference: No)	0.470^c	0.081	0.869	0.158
Drink (reference: No)	0.720^b	0.116	1.028	0.132
Medical insurance (reference: None)	1.275	0.291	1.263	0.215
Number of ADL limitations	1.056	0.041	1.037	0.042
Number of IADL limitations	1.044	0.042	0.993	0.039
Financial support (reference: None)	1.107^b	0.044	0.939	0.039
Pension (reference: None)	0.911	0.147	1.331^a	0.228
Self-rated health	1.238^c	0.071	1.267^c	0.070
Intercept	0.026^c	0.036	7.624	10.204

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