Summary statistics for plasma cotinine levels, overall and by self-reported number of smokers in the household (participants without measured cotinine levels above the LOQ were assigned the sample LOQ)
| Participants by self-reported SHS | Median plasma cotinine and IQR (ng/mL) |
| Overall (n=1172) | 0.05 (0.02, 0.17) |
| Current smokers in the household* | |
| 0 (n=777) | 0.03 (0.02, 0.12) |
| 1 (n=181) | 0.14 (0.04, 0.42) |
| ≥2 (n=58) | 0.28 (0.08, 0.99) |
*Data restricted to 1016 participants with self-reported SHS exposure data.
LOQ, lower limit of quantitation; SHS, secondhand smoke.