Table 2 The strength of association between HRQoL and smoking status (N = 12,887)

Never smoker (Ref)

Ex-occasional smoker

-.002

0.99

0.88

1.12

1.07

1.11

Ex-regular smoker

-.017

1.18

1.11

1.11

1.28

1.16

Light smoker

-.021

1.13

1.25

0.95

1.34

1.43

Moderate smoker

-.033

1.55

1.45

1.37

1.36

1.49

Heavy smoker

-.052

1.67

1.70

1.42

1.46

1.86

Correlation (predicted, observed)

0.61

0.63

0.51

0.59

0.53

0.34

R-squared (OLS)/pseudo R-squared (logistic regressions)

0.37

0.39

0.38

0.34

0.24

0.11