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Table 4 Tobit regression model of Factors associated with overall SF-6D utility score

From: SF-6D utility scores of smokers and ex-smokers with or without respiratory symptoms attending primary care clinics

Factor Coefficient 95% CI P-value
Sociodemographic
 Age in yeara −0.001 (− 0.002,0.001) 0.289
 Male 0.037 (0.006,0.069) 0.019
Education (University or above)
 Primary or below 0.022 (−0.012,0.057) 0.206
 Middle School 0.037 (0.002,0.073) 0.039
 High School 0.039 (0.002,0.075) 0.037
Occupation (Others)
 Retired −0.006 (−0.035,0.022) 0.665
 Working 0.018 (−0.007,0.042) 0.153
 Current smoker −0.006 (−0.023,0.012) 0.516
 Years since first smoking −0.001 (−0.002,0.001) 0.348
Cigarettes per day (Heavy)
 Light 0.013 (−0.009,0.034) 0.257
 Moderate 0.001 (−0.017,0.019) 0.936
Clinical
 Underweight or normal, BMI < 23 kg/m2 −0.003 (−0.021,0.014) 0.718
 Number of chronic diseases 0.004 (−0.006,0.014) 0.450
 Pulmonary Symptoms in BCSS scorea − 0.018 (−0.025,-0.011) < 0.001
 Airway obstruction 0.010 (−0.013,0.032) 0.393
  1. BMI body mass index, BCSS Breathlessness, Cough, and Sputum Scale, COPD chronic obstructive pulmonary disease, CI confidence interval
  2. aNegative coefficients indicated the increase in one unit of independent variable was associated with decrease in SF-6D score