Response rates by wave
| Wave 1 | Wave 2 | Wave 3 | ||||
| Interviewed | 2997 | 68.9% | 3040 | 70.8% | 3189 | 76.7% |
| No tobacco users reside | 957 | 22.0% | 191 | 4.5% | 384 | 9.2% |
| Non-respondents | 390 | 8.9% | 1061 | 24.7% | 584 | 14.1% |
| Total | 4344 | 4292 | 4157 | |||
Non-respondents included those who refused to participate, were not home or had moved away since a previous wave.