Days taken between each stage of the study
| Stage of study | Median | Mean | SD | Range |
| Index consultation to the postal date of invitation* | 22.0 | 19.7 | 9.6 | 2–42 |
| Index consultation to the baseline interview* | 56.0 | 61.3 | 23.0 | 28–122 |
| Postal date of invitation to receipt of the reply slip (accept or decline invitation) (n=46) | 23.5 | 22.1 | 16.4 | 3–68 |
| Declined invitation (n=19) | 30.0 | 26.3 | 17.3 | 3–68 |
| Consent (n=27) | 12.0 | 19.2 | 15.4 | 3–51 |
| Postal date of invitation to the baseline interview (n=27) | 37.0 | 41.6 | 18.8 | 18–80 |
| Receipt of reply slip to baseline interview (n=27) | 22.0 | 22.4 | 8.0 | 7–38 |
*n=23, consultation date was not available for four participants.