Self reported current smoking status or ETS exposure of non-smokers in 1991 and 1992
| 1992 | Current smoker | Non-smoker ETS (+) | Non-smoker ETS (−) |
|---|---|---|---|
| κ coefficient = 0.85 (95% confidence interval 0.80 to 0.89). | |||
| 1991 | |||
| Current smoker | 69 | 8 | 0 |
| Non-smoker ETS (+) | 6 | 150 | 11 |
| Non-smoker ETS (−) | 3 | 10 | 135 |