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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).