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Accuracy of the questionnaire on active smoking using the urinary cotinine cut-off concentration of 36.8 µg/g-creatinine (n = 89,895).
| True Condition | |||
|---|---|---|---|
| ≥36.8 µg/g-Creatinine | <36.8 µg/g-Creatinine | ||
| Questionnaire (Smoking) | Yes | 4017 | 136 |
| No | 3659 | 82,083 | |
| Sensitivity | 0.523 | ||
| Specificity | 0.998 | ||
| Positive Predictive Value | 0.967 | ||
| Negative Predictive Value | 0.957 | ||
