Table 4. Univariate and multivariate logistic regression models for variables of current smoker and former smoker associated with coronary artery plaque .

	Never smoker (n = 864)	Former smoker (n = 205)	Current smoker with lower pack-year (n = 454, ≤ 20 pack-years)	Current smoker with higher pack-year (n = 397, > 20 pack-years)
	OR (95%CI)	OR (95%CI)	OR (95%CI)	OR (95%CI)
Any plaque
Univariate	1 (ref)	0.885 (0.124-6.325)	0.238 (0.043-1.314)	1.382 (1.053-1.576)*
Multivariate	1 (ref)	1.258 (0.791-2.000)	0.918 (0.573-1.469)	1.598 (1.399-1.897)*
≥ 2/LM vessels disease
Univariate	1 (ref)	0.883 (0.655-1.190)	1.141 (0.743-1.752)	0.937 (0.661-1.328)
Multivariate	1 (ref)	0.589 (0.347-1.000)	0.769 (0.377-1.569)	0.702 (0.386-1.276)
Significant stenosis
Univariate	1 (ref)	1.402 (0.537-1.704)	1.703 (1.498-1.993)*	1.509 (1.398-1.650)*
Multivariate	1 (ref)	0.711 (0.448-1.127)	1.058 (1.042-1.075)*	1.830 (1.345-2.491)*
CACS ≥ 10
Univariate	1 (ref)	0.828 (0.623-1.100)	1.018 (0.682-1.521)	1.531 (1.025-1.738)*
Multivariate	1 (ref)	0.984 (0.938-1.031)	0.592 (0.312-1.124)	1.071 (1.051-1.093)*
Calcified plaque
Univariate	1 (ref)	1.651 (1.512-1.828)*	1.050 (0.749-1.471)	1.565 (1.428-1.746)*
Multivariate	1 (ref)	0.811 (0.464-1.416)	0.817 (0.512-1.303)	1.009 (0.967-1.052)
Non-calcified plaque
Univariate	1 (ref)	0.827 (0.590-1.160)	1.601 (1.473-1.763)*	1.629 (1.502-1.864)*
Multivariate	1 (ref)	0.831 (0.481-1.434)	1.034 (1.019-1.049)*	1.363 (1.018-1.826)*
Mixed plaque
Univariate	1 (ref)	0.904 (0.645-1.268)	0.677 (0.531-1.117)	1.548 (1.416-1.723)*
Multivariate	1 (ref)	0.695 (0.397-1.215)	0.636 (0.400-1.012)	1.063 (1.046-1.084)*

* Indicates vs. never smoker p < 0.05. The adjusted variables included age, BMI, family history of CAD, hypertension, diabetes mellitus, hyperlipidemia, stroke, TC, TG, LDL-C, HDL-C. Abbreviations are in Table 1 ,OR, odds ratio.