Table 1.

Longitudinal analysis of determinants of multimorbidity among people aged 50 years and older in China, 2011–15

		Adjusted odds ratio (95% CI)*	p value
Socioeconomic group
	Quartile 1 (lowest)	1 (ref)	..
	Quartile 2	1·13 (0·96–1·34)	0·15
	Quartile 3	1·25 (1·04–1·49)	0·016
	Quartile 4 (highest)	1·50 (1·24–1·82)	<0·0001
Age, per 5 years		2·93 (2·71–3·15)	<0·0001
Sex
	Male	1 (ref)	..
	Female	2·70 (2·04–3·57)	<0·0001
Marital status
	Married	1 (ref)	..
	Unmarried and others	1·37 (1·03–1·82)	0·030
Education
	Primary school and below	1 (ref)	..
	Secondary school	9·27 (5·85–14·67)	<0·0001
	College and above	5·17 (3·02–8·83)	<0·0001
Residence status
	Urban	1 (ref)	..
	Rural	0·59 (0·41–0·85)	0·005
	Rural-to-urban	0·76 (0·53–1·10)	0·14
Economic development region
	Group 1 (most affluent)	1 (ref)	..
	Group 2	5·37 (3·10–9·31)	<0·0001
	Group 3	4·06 (2·42–6·82)	<0·0001
	Group 4	3·25 (2·10–5·02)	<0·0001
	Group 5 (most deprived)	3·88 (2·25–6·69)	<0·0001
Health insurance
	None	1 (ref)	..
	Urban Employee Basic Medical Insurance	0·92 (0·63–1·35)	0·68
	Urban Resident Basic Medical Insurance	0·84 (0·58–1·20)	0·33
	New Rural Cooperative Medical Scheme	0·81 (0·62–1·04)	0·10
	Others†	0·77 (0·47–1·24)	0·28

^*Adjusted for age, sex, marital status, education, residence, socioeconomic status quartiles, health insurance, and economic development regions.

^†Examples include government health care, private medical insurance.