Table 3.
| Outcome | <1 month follow-up |
1 year follow-up |
2 years follow-up |
P interaction c | |||
|---|---|---|---|---|---|---|---|
| Intervention group, No. (%) | Control group, No. (%) | Intervention group, No. (%) | Control group, No. (%) | Intervention group, No. (%) | Control group, No. (%) | ||
| All women participating | 419 | 419 | 371 | 375 | 358 | 354 | |
| Positive attitude to screening (score ≥24) | 282 (68.9)d | 340 (83.3) | 280 (76.5)d | 317 (85.2) | 287 (80.6) | 285 (81.9) | .004 |
| Intending to screen (definitely/likely) | 308 (73.5)d | 363 (86.6) | — | — | 293 (81.8) | 301 (85.0) | .002 |
| Heightened decision regret (score >25)e | 59 (15.5) | 54 (14.0) | 64 (17.5) | 55 (14.9) | — | — | .81 |
| Attended screening (self-reported)e | 60 (15.2) | 80 (20.3) | 116 (31.1) | 116 (30.4) | 200 (55.1) | 204 (56.0) | .03 |
| Women participating in data linkage | 196 | 222 | 196 | 222 | 196 | 222 | |
| Attended screening (BSNSW/MBS record)e | 43 (21.9) | 54 (24.3) | 85 (43.4) | 80 (36.0) | 137 (69.9) | 154 (69.4) | .03 |
The Supplementary Methods (available online) and published protocol (20) give further details on outcomes and measurement. See Supplementary Table 4 (available online) for full analyses comparing groups over time and Supplementary Table 7 and Supplementary Figure 1 (available online) for additional analyses using linked screening data. BSNSW=Breast Screen New South Wales; MBS = Medicare Benefits Schedule.
For some variables, data are missing (max. 24 cases in a round).
Two-sided P value for group x time interaction.
Indicates where group differences are statistically significant at that timepoint.
The first data for regret and screening attendance are from 6-month follow-up including 396 women in the intervention group and 394 controls [attitude and intention were not assessed at 6 months, in line with the protocol (20)]. Decision regret was not assessed at 2-year follow-up (programming error). Self-report mammography numbers shown at each timepoint include all those responding in the current follow-up round and any women recorded as screened in an earlier round.