Descriptive statistics for urine cotinine replications (in ng/ml) for sample 1 (16 infants), sample 2 (20 children), and samples 1 and 2 combined
| Variable | Mean | SD | Minimum | Maximum |
|---|---|---|---|---|
| Sample 1 | ||||
| Cotton roll 1 | 5.25 | 6.03 | 0.1700 | 52.5 |
| Cotton roll 2 | 5.50 | 6.31 | 0.0850 | 44.3 |
| Standard 1 | 5.89 | 5.75 | 0.1170 | 51.3 |
| Standard 2 | 6.03 | 5.62 | 0.0740 | 53.5 |
| Sample 2 | ||||
| Replication 1 | 2.48 | 3.36 | 0.1760 | 65.8 |
| Replication 2 | 2.47 | 3.32 | 0.1410 | 65.3 |
| Replication 2 | 2.43 | 3.38 | 0.1750 | 67.8 |
| Replication 3 | 2.45 | 3.34 | 0.1560 | 66.0 |
| Samples 1 and 2 combined | ||||
| Pooled replications | 3.56 | 4.59 | 0.1695 | 66.2 |