Table 4.

The univariate Cox analysis of social support on cognitive impairment.

Social support	SHR (95% CI)	p
Marital status	Reference (widowed)
Married	0.840 (0.722–0.976)	0.023
Separated	0.419 (0.241–0.728)	0.002
Divorced	0.666 (0.247–1.799)	0.423
Never married	1.403 (0.577–3.415)	0.455
Children's visit	0.798 (0.664–0.960)	0.017
Siblings' visit	0.906 (0.765–1.072)	0.250
Money give	Reference (no)
Yes	0.895 (0.773–1.036)	0.138
Unknown	0.932 (0.593–1.465)	0.761
Money receive	Reference (no)
Yes	1.088 (0.883–1.340)	0.430
Unknown	1.170 (0.745–1.837)	0.496
Sick care	Reference (no)
Yes	0.776 (0.541–1.113)	0.168
Unknown	1.154 (0.719–1.852)	0.553
Social security	0.987 (0.849–1.148)	0.867
Social service	1.071 (0.936–1.226)	0.318

The variables were included in model separately, after controlling for gender, age, residence, negative well-being, ADL, drink, smoking, education, exercise, baseline MMSE, occupation, disease, and leisure activities. When children's visit and siblings' visit were examined, children alive and siblings alive was additional adjusted in the model respectively; when money given to and money received from children were examined, children alive was also controlled; when sick care was examined, children alive and marital status were additional adjusted in the model. For marital status, Married maps married and living with the spouse; Separated maps married and not living with the spouse.