Point-biserial correlations of cotinine with self-report secondhand smoke (SHS) exposure measures
| Personal residence | Friends’ residence | Relatives’ residence | Automobile | Public place | Other area | 4-Item sum scale | 3-Item sum scale | |
|---|---|---|---|---|---|---|---|---|
| 24 h | 0.37* | 0.28* | 0.43* | 0.26* | 0.05 | −0.02 | 0.46* | – |
| 7 days | 0.41* | 0.45* | 0.38* | 0.16 | 0.01 | −0.05 | – | 0.53* |
Scales calculated for items with significant correlations: the 3-item scale sums past 7-day SHS exposure in the residence of one's own, of friends and of relatives, range 0–3; the 4-item scale sums past 24-h residential SHS exposure and automobile SHS exposure, range 0–4.
*p<0.01.