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Table 4 Multiple linear regression model to evaluate predictors for total SGRQ 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

Final total SGRQ (%) Dependent variables Coefficient (95% CI) p-value
  Male -0.14 (-6.69, 6.40) 0.965
  Age (y) -0.16 (-0.67, 0.34) 0.525
  Smoking 3.05 (-4.28, 10.39) 0.410
  SpO2 (%) -0.27 (-0.89, 0.35) 0.389
  FEV1 (%) -0.14 (-0.28, -0.01) 0.043
  6MWD (m) 0.01 (-0.02, 0.05) 0.433
  BMI (kg/m2) 0.27 (-0.26, 0.79) 0.315
  MMRC (score) 9.99 (6.68, 13.30) < 0.001
  Charlson index (score) -0.19 (-2.84, 2.45) 0.883
  Number of exacerbations 1.29 (0.11, 2.47) 0.031
  1. SpO2: pulse oximetry; FEV1: forced expiratory volume in the first second (% of predicted); 6MWD: six-minute walking distance; BMI: body mass index; MRC: Modified Medical Research Council; R2 = 0.63; p < 0.05.