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Values for the false positive rate calculated by iteratively excluding sessions from the two categories producing false positives.
| Category | Detected false smoking sessions, n | Excluded sessions, n | Corrected false smoking sessions, n | Total possible sessions, n | False positive rate, % |
| Ground assumption | 22 | 0 | 22 | 777 | 2.8% |
| Clearly smoking | 22 | 6 | 16 | 771 | 2.1% |
| True false positive | 22 | 0 | 16 | 771 | 2.1% |
