Table 2.

Univariate and multivariate Cox regression analyses of mortality according to body mass index quartile

Mortality	Crude model			Model 1			Model 2
	HR	95% CI	P	HR	95% CI	P	HR	95% CI	P
All-cause mortality
Quartile 2	Reference			Reference			Reference
Quartile 1	0.910	0.832–0.995	0.039	0.931	0.851–1.018	0.118	0.965	0.856–1.088	0.557
Quartile 3	1.048	0.958–1.146	0.309	1.061	0.970–1.161	0.195	1.040	0.923–1.171	0.521
Quartile 4	1.140	1.042–1.247	0.004	1.145	1.047–1.253	0.003	1.154	1.025–1.300	0.018
All-cause mortality in DM patients
Quartile 2	Reference			Reference			Reference
Quartile 1	0.931	0.787–1.103	0.410	0.940	0.794–1.113	0.472	0.979	0.781–1.226	0.852
Quartile 3	0.957	0.807–1.134	0.611	0.936	0.790–1.110	0.449	0.866	0.692–1.084	0.209
Quartile 4	1.041	0.874–1.239	0.656	1.017	0.854–1.211	0.851	0.930	0.734–1.179	0.550
All-cause mortality in non-DM patients
Quartile 2	Reference			Reference			Reference
Quartile 1	0.903	0.812–1.004	0.059	0.922	0.830–1.025	0.135	0.944	0.819–1.087	0.423
Quartile 3	1.096	0.986–1.218	0.088	1.110	0.999–1.234	0.053	1.072	0.932–1.232	0.332
Quartile 4	1.175	1.058–1.305	0.003	1.190	1.072–1.322	0.001	1.176	1.024–1.350	0.022

CI, confidence interval; DM, diabetes mellitus; HR, hazard ratio.

Model 1, multivariate model including age and gender; Model 2, multivariate model including model 1 + DM, serum albumin level, serum hemoglobin, total cholesterol, systolic blood pressure, diastolic blood pressure, HbA1c, total body water (TBW), protein equivalent of total nitrogen appearance (PNA), normalized PNA (PNA/[TBW/0.58]), urine duration, Kt/Vurea week total, and creatinine clearance weekly.