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Geometric means and standard deviations of household nicotine, serum cotinine, and hair cotinine by study visit
| Baseline |
6-Month visit |
12-Month visit |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| N | M | SD | N | M | SD | N | M | SD | |
| Household nicotine (μg/m3) |
0 | 206 | 0.43 | 7.8 | 207 | 0.42 | 8.1 | ||
| Serum cotinine (ng/ml) |
220 | 1.2 | 3.5 | 210 | 1.0 | 4.0 | 213 | 1.1 | 4.5 |
| Hair cotinine (ng/mg) |
205 | 0.14 | 3.6 | 190 | 0.12 | 4.4 | 200 | 0.15 | 3.2 |
N, available sample; M, geometric mean; SD, geometric standard deviation.
