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Table 1 Dependence measured with FTND and HSI tests in the 1655 daily smokers: concordance between them, and diagnostic accuracy statistics of HSI.

From: Fagerstrom test for nicotine dependence vs heavy smoking index in a general population survey

 

Males

Females

All

N

941

714

1,655

FTND-High dependence

15.6% (13.0-18.3)

10.6% (7.8-13.4)

13.6% (11.6-15.5)

HSI-High dependence

18.3% (15.5-21.1)

10.0% (7.2-12.8)

14.9% (12.9-16.9)

Kappa

0.75 (p < 0.0001)

0.60 (p < 0.0001)

0.70 (p < 0.0001)

Sensitivity, CI (95%)

83.1% (76.1-90.1)

62.3% (49.3-75.3)

76.2% (69.8-82.6)

Specificity, CI (95%)

95.7% (94.3-97.2)

96.8% (95.4-98.2)

96.2% (95.2-97.2)

Accuracy, CI (95%)

94.1% (92.5-95.6)

93.8% (92.0-95.7)

94.0% (92.8-95.1)

+PV, CI (95%)

74.6% (67.0-82.3)

64.4% (51.3-77.5)

71.6% (65.0-78.1)

-PV, CI (95%)

97.4% (96.2-98.6)

96.5% (95.0-98.0)

97.0% (96.1-97.9)

  1. CI: confidence interval, +PV: positive predictive value, -PV: negative predictive value.