Table 3.

Multivariable linear regression for log₁₀ GCD.

	Model 1			Model 2
	Estimate	S.E	p	Estimate	S.E	p
Current smoking	0.265	0.103	0.012	0.226	0.100	0.028
CB classic def	0.257	0.115	0.029	0.218	0.111	0.054
CB SGRQ def	0.190	0.098	0.058	0.118	0.100	0.240

Model one is adjusted for age, gender, and race; model two is adjusted for age, gender, race, and FEV₁%predicted. Current smoking, CB classic definition and CB SGRQ definition were each tested in separate models with the covariates.

The bolded p values are considered statistically significant.