Table 3 Analysis of variable associated to COPD by BS. Age, BMI, MS, and FEV1% pred were the independent variables

BS/TS

−0.6366

0.485

0.205

−0.171

−0.541

− 0.334

−0.67

− 0.222

−1.615

(− 1.11- -0.154)

(− 0.081–1.052)

(− 0.388 - 0.799)

(−0.495–0.152)

(− 0.958 – − 0.123)

(−0.903–0.235)

(−1.020 – − 0.321)

(−1.00–0.555)

(−2.51 – − 0.713)

Age (years)

0.0032

0.027

0.014

0.013

−0.012

− 0.014

−0.027

0.344

0.007

(−0.235–0.030)

(− 0.003–0.059)

(− 0.018 - 0.047)

(−0.004–0.031)

(− 0.035-0.010)

(−0.046–0.172)

(−0.047 – − 0.008)

(−0.008–0.077)

(−0.042–0.058

BMI

−0.006

− 0.01

−0.016

− 0.011

0.014

0.035

0.001

−0.017

−0.007

(−0.44–0.032)

(−0.005–0.034)

(− 0.064–0.030)

(− 0.037-0.014)

(−0.019–0.047)

(−0.009–0.080)

(− 0.026 - 0.028)

(−0.079–0.044)

(−0.791–0.064)

MS

− 0.089

−0.022

− 0.321

0.0004

0.014

0.479

0.01

−0.458

−0.576

(−0.514–0.336)

(−0.557–0.477)

(− 0.845–0.202)

(−0.289–0.280)

(−0.353–0.382)

(−0.022–0.981)

(−0.297–0.318)

(−1.144–0.228)

(−1.372–0.219)

FEV₁%p

−0.006

0.001

0

0

−0.001

0.001

0.005

−0.013

0

(−0.018–0.005)

(−0.012–0.015)

(− 0.014 - 0.149)

(−0.007–0.008)

(− 0.011 - 0.009)

(−0.012–0.015)

(−0.003–0.013)

(−0.032–0.006)

(−0.023–0.021)