The Long-Term Prognostic Significance of 6-Minute Walk Test Distance in Patients with Chronic Heart Failure

Table 3

Unadjusted univariable predictors of all-cause mortality in patients with CHF (in order of Chi-square value).

Variables	𝑃 value	HR	95% CI		Chi-square
			Lower	Upper
Log NT pro-BNP	<0.0001	1.63	1.53	1.74	230.8
6-MWT (m)*	<0.0001	0.968	0.964	0.973	184.1
Age (years)	<0.0001	1.05	1.04	1.06	137.2
Urea (mmol·L^−1)	<0.0001	1.05	1.05	1.06	128.9
Haemoglobin (g·dL^−1)	<0.001	0.84	0.81	0.87	96.9
NYHA class	<0.0001	1.64	1.48	1.82	89.0
Creatinine (u·moL^−1)*	<0.001	1.023	1.016	1.029	58.3
Diastolic BP (mmHg)	<0.001	0.99	0.98	0.99	42.4
Sodium (mmol·L^−1)	<0.001	0.96	0.94	0.97	27.1
QRS duration (ms)*	<0.001	1.05	1.03	1.07	18.3
BMI (kg·m^−2)	<0.001	0.98	0.97	0.99	14.6
Systolic BP (mmHg)	<0.001	1.00	0.99	1.00	8.9
Heart rate (beats·min^−1)	0.01	1.00	1.00	1.01	7.1

HR: hazard ratio; 95% CI: 95% confidence intervals; 6-MWT: 6-minute walk test; NYHA: New York Heart Association; LVI: left ventricular impairment; *HR reported for 10-unit increment.