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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.