Table 3.
Multivariate logistic regression model for gFOBT uptake amongst 70–74-year-olds (n = 36,561).
| Adequately screened at 12 weeks | Odds ratio | P value | 95% lower confidence limit | 95% upper confidence limit |
|---|---|---|---|---|
| Intervention group (reference = control group) |
||||
| A | 0.94 | 0.381 | 0.81 | 1.08 |
| B | 1.03 | 0.739 | 0.89 | 1.19 |
| C | 0.88 | 0.318 | 0.69 | 1.13 |
| D | 1.34 | 0.001 | 1.13 | 1.59 |
| Contamination variable (reference = uncontaminated) |
||||
| Contaminated-control | 1.03 | 0.806 | 0.84 | 1.26 |
| Contaminated-A | 1.08 | 0.725 | 0.72 | 1.61 |
| Contaminated-B | 1.03 | 0.906 | 0.64 | 1.67 |
| Age at invitation (reference = 70 years) |
0.96 | 0.001 | 0.94 | 0.98 |
| Previous screening status (reference = previously screened) |
||||
| First-timers | 0.09 | <0.001 | 0.07 | 0.12 |
| Previous nonresponders | 0.02 | <0.001 | 0.02 | 0.02 |
| Interaction term: previous screening status × age at invitation | ||||
| First-timers | 1.12 | 0.018 | 1.02 | 1.24 |
| Previous nonresponders | 1.24 | <0.001 | 1.19 | 1.29 |
| IMD score | 0.99 | <0.001 | 0.98 | 0.99 |
| Date the kit was sent (days) | 0.9996 | <0.001 | 1.00 | 1.00 |
| Constant | 11733.30 | <0.001 | 484.95 | 283884.90 |