| Baseline smoking status | p-value | |||
| Never-smokers | Ex-smokers | Current smokers | ||
| Smear | <0.001 | |||
| Subjects n | 2246 | 1864 | 1450 | |
| Not available | 26.5 | 26.7 | 22.1 | |
| Converted | 67.7 | 62.3 | 64.7 | |
| Not converted | 5.8 | 11.1 | 9.4 | |
| Culture | <0.001 | |||
| Subjects n | 3919 | 3102 | 2473 | |
| Not available | 31.0 | 30.7 | 26.4 | |
| Converted | 64.1 | 62.2 | 64.1 | |
| Not converted | 4.9 | 7.2 | 9.4 | |
Data are presented as %, unless otherwise stated.