Parental smoking status | Urinary cotinine at 4 year (ng/mL) | ||||
---|---|---|---|---|---|
N | Median | Mean (SD) | Range | p-value | |
At 4 year: | |||||
No smoker | 94 | 4.60 | 6.50 (6.68) | 0.20 – 36.00 | - |
Only father | 64 | 6.45 | 10.57 (11.23) | 1.10 – 57.40 | 0.004 |
Only mother | 52 | 16.30 | 27.78 (30.58) | 2.60 – 170.20 | <0.001 |
Both mother and father | 96 | 19.60 | 33.06 (41.47) | 2.10 – 300.90 | <0.001 |