Table 4.

Summary of results from linear regression analyses on natural logarithm (ln) of plasma GDF15 levels.

Independent Variables	B	SE	β standardized	t	p
Model 1 (adjusted R2 = 0.378, ANOVA: F = 14.8, n = 91)
(Constant)	4.13	0.294		14.1	0.001
Age	0.250	0.005	0.491	5.49	0.001
Smoking	0.300	0.080	0.313	3.75	0.001
Gender	−0.163	0.081	−0.176	−2.00	0.049
Ln CGI	−0.197	0.076	−0.221	−2.58	0.012
Model 2 (adjusted R2 = 0.309, ANOVA: F = 22.5, n = 96)
(Constant)	3.83	0.256		15.197	0.001
Age	0.030	0.005	0.590	6.661	0.001
HDL	−0.274	0.097	−0.234	−2.643	0.01
Model 3 (adjusted R2 = 0. 336, ANOVA: F = 25.5, n = 97)
(Constant)
Age	0.026	0.044	0.490	5.92	<0.001
Smoke	0.327	0.082	0.338	4.09	0.001
Model 4 (adjusted R2 = 0.359, ANOVA: F = 13.8, n = 95)
(Constant)	4.11	0.293		14.0	0.001
Age	0.026	0.005	0.514	5.81	0.001
Smoking	0.252	0.078	0.269	3.22	0.002
Gender	−0.171	0.079	−0.188	−2.15	0.034
Ln CGI	−0.194	0.076	−0.218	−2.55	0.012

CGI: Clinical Global Impression-Severity.

HDL: high-density-lipoprotein.