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Table 3 Multiple linear regression model to evaluate predictors for baseline total SGRQ and after three years follow-up (n = 95)

From: Predictors of health status do not change over three-year periods and exacerbation makes difference in chronic obstructive pulmonary disease

Variables

Baseline total SGRQ Coefficient (95% CI)

p-value

Final total SGRQ Coefficient (95% CI)

p-value

Male

1.11 (-6.32, 8.56)

0.766

-1.02 (-7.67, 5.62)

0.760

Age (y)

-0.51 (-1.05, 0.01)

0.059

-0.14 (-0.67, 0.37)

0.570

Smoking

5.68 (-1.55, 12.93)

0.122

1.96 (-5.46, 9.40)

0.600

SpO2 (%)

-0.22 (-1.29, 0.84)

0.675

-0.27 (-0.91, 0.36)

0.395

FEV1 (%)

-0.11 (-0.25, 0.25)

0.105

-0.18 (-0.32, -0.05)

0.007

6MWD (m)

-0.01 (-0.05, 0.03)

0.731

0.01 (-0.02, 0.56)

0.426

BMI (kg/m2)

-0.24 (-0.75, 0.23)

0.349

0.18 (-0.34, 0.72)

0.489

MMRC (score)

11.72 (8.17, 15.26)

< 0.001

10.44 (7.08, 13.80)

< 0.001

Charlson index

-1.16 (-3.82, 1.48)

0.384

-0.39 (-3.10, 2.30)

0.770

  1. SpO2: pulse oximetry; FEV1: forced expiratory volume in the first second (% of predicted); 6MWD: six-minute walking distance; BMI: body mass index; MMRC: Modified Medical Research Council; Baseline (R2 = 0.58; p < 0.05); After three years (R2 = 0.61; p < 0.05).