Salivary cotinine and creatinine-adjusted total NNAL levels by site
| Country | n | Salivary cotinine (ng/mL) | Total NNAL—visit 2—creatinine normalized (ng/mg creatinine) |
|---|---|---|---|
| Geometric mean (95% confidence limits) | Geometric mean (95% confidence limits) | ||
| Canada | 25 | 268 (208-346) | 0.072 (0.054-0.097) |
| United States (New York) | 24 | 236 (200-279) | 0.290 (0.203-0.416) |
| United States (Minnesota) | 27 | 232 (174-309) | 0.217 (0.167-0.283) |
| Australia | 25 | 337 (289-392) | 0.109 (0.075-0.158) |
| United Kingdom | 23 | 213 (169-268) | 0.139 (0.096-0.202) |