Skip to main content

Table 8 Reclassification table for risk of CVD incidence between the model with age at quitting incorporated into smoking status (Model 2) and the model with a current/non-smoker smoking measure (Model 1) as the reference model

From: Age at quitting smoking as a predictor of risk of cardiovascular disease incidence independent of smoking status, time since quitting and pack-years

Model 1

Model 2

 

Frequency (Row per cent)

< 6%

6-<10%

10-<20%

> = 20%

Total

Participants who experience a CVD Event

     

<6%

158

16

0

0

174

6-<10%

8

53

12

0

73

10-<20%

0

5

60

6

71

> = 20%

0

0

8

57

65

Total

166

74

80

63

383

Net gain in reclassification proportion (p-value)

0.0339(0.0796)

 

Participants who do not experience a CVD Event

     

<6%

1750

53

0

0

1803

6-<10%

75

469

67

0

611

10-<20%

0

79

499

36

614

> = 20%

0

0

60

280

340

Total

1825

601

626

316

3368

Net gain in reclassification proportion (p-value)

0.0172(0.0025)

 

NRI (p-value)

0.0511(0.0112)

 

Overall net gain in reclassification proportion with respect to risk category > = 20%(p-value)

0.0019(0.8518)

 

Overall gross gain in reclassification proportion with respect to risk category > = 20%(p-value)

0.0263(<0.0001)

Â