Table 2.

Univariable and Multivariable Linear Regression Analysis for TB and Baseline Lung Function Parameters in the Total Group and Subgroups by GOLD Stages

	Univariable		Multivariable
	β Estimate (95% CI)	P values	β Estimate (95% CI)	P values
Total group
FEV1, L	0.008(−0.003~0.02)	0.157	0.02(0.001~0.02)	0.025
FEV1pred,%	0.15(−0.25~0.55)	0.465	0.32(−0.06~0.69)	0.097
FVC, L	0.01(−0.001~0.03)	0.063	0.02(0.002~0.03)	0.022
FVCpred,%	0.15(−0.24~0.54)	0.458	0.26(−0.11~0.63)	0.170
FEV1/FVC,%	−0.01(−0.20~0.17)	0.893	0.07(−0.10~0.25)	0.416
GOLD 1
FEV1, L	0.01(−0.003~0.02)	0.123	0.01(0.001~0.02)	0.032
FEV1pred,%	0.16(−0.15~0.48)	0.308	0.25(−0.06~0.04)	0.117
FVC, L	0.02(−0.002~0.04)	0.076	0.01(0.00~0.03)	0.054
FVCpred,%	0.16(−0.28~0.60)	0.473	0.24(−0.17~0.66)	0.254
FEV1/FVC,%	−0.03(−0.16~0.10)	0.660	0.03(−0.1~0.15)	0.686
GOLD 2
FEV1, L	0.004(−0.01~0.02)	0.451	0.01(−0.003~0.01)	0.215
FEV1pred,%	0.05(−0.22~0.32)	0.716	0.08(−0.19~0.35)	0.561
FVC, L	0.004(−0.02~0.02)	0.702	0.01(−0.01~0.02)	0.515
FVCpred,%	−0.05(−0.45~0.35)	0.791	−0.05(−0.45~0.36)	0.825
FEV1/FVC,%	0.07(−0.19~0.34)	0.580	0.09(−0.18~0.35)	0.517
GOLD 3–4
FEV1, L	0.01(−0.007~0.02)	0.284	0.01(−0.01~0.03)	0.298
FEV1pred,%	0.16(−0.36~0.69)	0.537	0.27(−0.30~0.84)	0.343
FVC, L	0.03(−0.012~0.07)	0.155	0.03(−0.02~0.07)	0.222
FVCpred,%	0.61(−0.45~1.66)	0.253	0.69(−0.48~1.86)	0.241
FEV1/FVC,%	−0.21(−0.69~0.27)	0.389	−0.11(−0.63~0.41)	0.667

Notes: P values marked bold indicate that the value is statistically significant. Multivariable linear regression analysis models were adjusted for age, sex, BMI, smoking status, smoke index, passive smoker, occupational exposure, comorbidities and family history of respiratory diseases. β estimates from Multivariate linear regression analysis were the unstandardized β estimates. Other abbreviations see Table 1.

Abbreviation: CI, confidence interval.