Table 2 Univariate analyses of associations between various factors and MMP-9 in non-COPD and COPD, respectively

Sex (female^†)

−0.050

0.122

−0.070

0.087

Age^‡

0.003

0.928

0.037

0.370

Underweight (normal weight^†)

0.038

0.512

−0.039

0.560

Overweight (normal weight^†)

−0.018

0.634

−0.051

0.266

Obese (normal weight^†)

0.064

0.155

0.022

0.706

Pack years^‡

0.096

0.003

0.115

0.005

Ex-smoker (non smoker^†)

−0.011

0.744

0.098

0.052

Current smoker (non smoker^†)

0.118

0.005

0.218

<0.001

Productive cough, prc (no prc^†)

0.040

0.215

0.119

0.004

mMRC ≥ 2 (<2^†)

0.029

0.377

0.049

0.238

FEV₁% pred^‡

−0.060

0.067

−0.131

0.001