Table 2.

Multivariate Cox regression analysis of the impact of hypertension and frailty on death risk in older adults according to the different agegroups

Variables	Overall (n = 1197)		60–69 years (n = 378)		70–79 years (n = 415)		≥ 80 years (n = 404)
	HR(95%CI)	P-value	HR(95%CI)	P-value	HR(95%CI)	P-value	HR(95%CI)	P-value
Age	1.048(1.042–1.055)	< 0.001	1.077(1.049–1.106)	< 0.001	1.046(1.025–1.068)	< 0.001	0.994(0.953–1.037)	0.784
Gender	0.721(0.662–0.786)	< 0.001	0.623(0.526–0.739)	< 0.001	0.735(0.646–0.836)	< 0.001	0.850(0.720–1.003)	0.054
Education levela
Junior high school	0.977(0.901–1.046)	0.397	0.923(0.833–1.057)	0.294	0.965(0.849–1.114)	0.326	0.933(0.877–1.366)	0.233
Senior high school or above	0.864(0.812–1.019)	0.183	0.811(0.732–1.016)	0.109	0.852(0.766–1.021)	0.079	0.847(0.807–1.173)	0.128
Marital status	1.371(1.219–1.543)	< 0.001	1.369(1.150–1.630)	< 0.001	1.269(1.059-–1.521)	0.010	1.632(1.107–2.405)	0.013
Hypertension and frailty statusb
Hypertension and no frailty	1.406(1.237–1.597)	0.005	1.331(1.159–2.354)	0.021	1.594(1.113–1.744)	0.018	1.174(0.774–1.781)	0.450
No hypertension but frailty	1.484(1.259–1.933)	< 0.001	1.345(1.052–1.721)	0.018	1.511(1.254–1.820)	< 0.001	1.223(0.948–1.578)	0.122
Hypertension and frailty	1.792(1.642–1.957)	< 0.001	2.122(1.777–2.533)	< 0.001	1.821(1.604–2.067)	< 0.001	1.573(1.338–1.850)	< 0.001

Abbreviations: FI Frailty index

^aPrimary school is the control group

^bNo hypertension and no frailty is the control group