Table 5.

Multinomial logistic regression on IPA subgroups.

Variable	Class two		Class three
	OR	95%CI	OR	95%CI
Education (elementary school)	1.389*	1.067–1.809	2.163**	1.531–3.056
Aged
60~	0.381**	0.279–0.521	0.374**	0.252–0.556
70~	0.592**	0.435–0.805	0.662*	0.454–0.965
Month income (1,000~2999 RMB)	1.379**	1.084–1.755	0.757	0.561–1.023
Job
Famer	0.429**	0.309–0.596	0.36**	0.223–0.583
Worker	0.527**	0.406–0.685	2.177**	1.496–3.167
Impaired mobility (No)	1.407*	1.014–1.951	0.676*	0.463–0.985
Impaired speech (No)	0.282**	0.160–0.495	0.179**	0.098–0.328
Use assistive devices (No)	0.605**	0.492–0.745	0.622**	0.469–0.824
Primary caretaker (non-spouse)	2.097**	1.501–2.930	1.572	0.986–2.504
Number of chronic diseases (1)	2.294**	1.523–3.457	4.711**	2.387–9.295
ADL
No dependence	0.361	0.103–1.258	0.018**	0.005–0.062
Mild dependence	0.314	0.087–1.136	0.039**	0.011–0.139

*P < 0.05, **P < 0.01; Reference group: Class one; OR: Odds ratio; 95%CI: 95% Confidence Interval.