Table 2.

Univariable associations of baseline characteristics and left ventricular ejection fraction

Clinical characteristics	Mean difference (95% CI)*	P value*	r a	R 2 *	Pseudo R 2 lower bound b	Pseudo R 2 upper bound b
Age, years	0.31 (0.25–0.37)	<0.001	0.222	0.063	0.067	0.055
Female	6.89 (5.51–8.28)	<0.001	0.229	0.005	0.050	0.046
Weight, kg c	−0.01 (−0.16 to 0.17)	0.923	−0.017	<0.001	<0.001	<0.001
Systolic blood pressure, mmHg c	1.23 (0.96–1.49)	<0.001	0.214	0.046	0.042	0.038
Comorbidities
Atrial fibrillation	2.37 (0.94–3.80)	0.001	0.072	0.006	0.007	0.004
Cerebrovascular disease	1.89 (−0.46 to 4.23)	0.115	0.038	0.002	0.002	0.002
COPD	3.09 (1.45–4.74)	<0.001	0.088	0.008	0.007	0.007
Diabetes	1.05 (−0.37 to 2.47)	0.148	0.038	0.001	0.001	0.002
PCI/CABG	−2.63 (−4.17 to −1.08)	0.001	−0.089	0.007	0.005	0.005
Severe valvular heart disease	0.41 (−1.39 to 2.22)	0.655	0.008	<0.001	<0.001	<0.001
Sleep apnoea	0.60 (−1.61 to 2.82)	0.592	0.017	<0.001	0.001	<0.001
Laboratory analysis
Creatinine, μmol/L c	−0.02 (−0.09 to 0.06)	0.680	−0.004	<0.001	<0.001	<0.001
Sodium, mmol/L	−0.03 (−0.18 to 0.11)	0.652	0.014	<0.001	<0.001	<0.001
Troponin I, ng/L	0.38 (−0.75 to −0.01)	0.050	−0.257	0.004	0.005	0.005
NT‐proBNP, ng/L d	−0.04 (−0.05 to −0.03)	<0.001	−0.282	0.003	0.028	0.029

CI, confidence interval; COPD, chronic obstructive pulmonary disease; NT‐proBNP, N‐terminal pro brain natriuretic peptide.

^*Mean difference and confidence intervals, R ² value, and P value derived from univariable linear regression analysis.

^a r value derived from correlation analysis.

^b Pseudo R ² value derived from interval regression analysis (six left ventricular ejection fraction categories using per 10% cut‐offs).

^c Per a unit of 10.

^d Per a unit of 100.