Table 3 Tobit regression analysis of the factors affecting EQ-5D index scores of Shidu parents.

Independent variables	Reference	Coefficient	95% CI	t	P
Constant		1.034	0.896 to 1.172	14.76	< 0.001
Age
< 60	≥ 60	0.037	− 0.006 to 0.081	1.68	0.093
City
Wuhu	Anshun	− 0.043	− 0.098 to 0.012	− 1.54	0.123
Hangzhou	Anshun	0.077	0.017 to 0.137	2.51	0.012
Having grandchildren
No	Yes	− 0.034	− 0.086 to 0.017	− 1.31	0.192
Marital status
Married	Divorced/bereaved of one’s spouse	0.072	0.033 to 0.110	3.64	< 0.001
Education level
Junior high school and below	College and above	− 0.150	− 0.231 to − 0.069	− 3.65	< 0.001
Senior high school	College and above	− 0.136	− 0.224 to − 0.048	− 3.03	0.003
Number of diseases
0	≥ 3	0.145	0.082 to 0.208	4.54	< 0.001
1	≥ 3	0.126	0.071 to 0.181	4.48	< 0.001
2	≥ 3	0.045	− 0.008 to 0.098	1.67	0.096
Self-reported health status
Good	Poor	0.128	0.065 to 0.191	3.99	< 0.001
Moderate	Poor	0.106	0.049 to 0.162	3.66	< 0.001
SSRS score		− 0.001	− 0.003 to 0.002	− 0.38	0.706
GDS score		− 0.015	− 0.018 to − 0.011	− 7.48	< 0.001

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