Table 2.

Initial classification table: SSSBQ self-reported smoking status and urinary cotinine test results

SSSBQ self-reported smoking statusUrinary cotinine test result
Total (N = 55)
PositiveNegative
Positive31132
Negative32023
Total3421
  • NOTE: Using urinary cotinine as the gold standard, self-reported smoking status had sensitivity of 91% and specificity of 95% (κ = 0.85, P < 0.001, 95% confidence interval = 0.71-0.99). Assuming smoking prevalence in the lung cancer screening population was represented in this sample, the positive predictive value of self-report was 97%, and the negative predictive value was 87%.