Table 4. Linear regression coefficients of SHS exposure in childhood, adulthood and both (independent variable) for composite carotid artery IMT (dependent variable) in the total sample, adjusting for covariates^a.

Independent Variable	Yes/No			Duration in Years
Independent Variable	β (95% CI)	β′	R²	β (95% CI)	β′	R²
Model 1: SHS exposure in childhood only	25.0^** (10.1, 39.9)	0.180^**	2.9%	3.2^** (1.4, 5.0)	0.186^**	2.9%
Model 2: SHS exposure in adulthood only	28.3 (-6.8, 63.4)	0.106	1.0%	1.5^* (0.1, 2.9)	0.145^*	1.9%
Model 3: SHS exposure in both childhood and adulthood	24.9^** (12.6, 37.2)	0.235^**	3.1%	2.1^** (0.7, 3.5)	0.181^**	1.9%

Race, sex, age, education, income, BMI, systolic BP, LDL-C and TG/HDL-C ratio were included in the models as covariates for adjustment.

SHS=secondhand smoke; IMT= intima-media thickness (μm); BMI=body mass index; BP= blood pressure; L(H)DL-C=low-(high-) density lipoprotein cholesterol; TG=triglycerides

β (95% CI) = unstandardized regression coefficients (95% confidence interval); β′ = standardized regression coefficients; R² =variance of IMT explained by the independent variable

Regression coefficients different from 0:

p<0.05;

^**

p<0.01

Table 4. Linear regression coefficients of SHS exposure in childhood, adulthood and both (independent variable) for composite carotid artery IMT (dependent variable) in the total sample, adjusting for covariatesa.

Table 4. Linear regression coefficients of SHS exposure in childhood, adulthood and both (independent variable) for composite carotid artery IMT (dependent variable) in the total sample, adjusting for covariates^a.