Table 3.
Percentile |
||||||
---|---|---|---|---|---|---|
Mean | 2.5th | 25th | 50th | 75th | 97.5th | |
Cut-off (cotinine units: nmol/l)b | 29.8 | 20.0 | 26.5 | 29.6 | 32.2 | 56.0 |
Sensitivity (%)c | 81.9 | 77.3 | 80.4 | 82.0 | 83.5 | 86.4 |
Specificity (%)c | 99.4 | 99.1 | 99.3 | 99.4 | 99.6 | 99.7 |
Estimates found by 10,000 re-samplings of the observed data (non-parametric bootstrap method).
Antilog of logarithmic values.
Sensitivity and specificity for self-reported daily smoking: information on smoking habits during pregnancy was missing for 22 women and excluded for 27 women using other kinds of nicotine products.