Screenee and institutional factors associated with detection rates following CTC, derived via a multilevel logistic regression model and expressed as ORs
| Variable | Crude OR | p Value* | Random effects model OR | p Value* | |
|---|---|---|---|---|---|
| Screenee factors | Men (vs women) | 1.86 (1.56 to 2.23) | <0.001 | 1.83 (1.50 to 2.23) | <0.001 |
| Screened for second time (vs first time) | 0.73 (0.60 to 0.87) | <0.001 | 0.75 (0.61 to 0.93) | <0.001 | |
| Screened for third time (vs first time) | 0.46 (0.29 to 0.69) | <0.001 | 0.43 (0.26 to 0.70) | <0.001 | |
| Age (per year increase) | 1.04 (1.02 to 1.06) | <0.001 | 1.04 (1.02 to 1.06) | <0.001 | |
| Institutional factors | Three-dimensional review of images (vs primary two-dimensional) | 1.31 (1.07 to 1.60) | 0.010 | 1.38 (1.02 to 1.95) | 0.023 |
| Experience of radiologist (vs <300 cases) | |||||
| High (1000+ cases) | 1.49 (1.16 to 1.94) | 0.020 | 1.44 (1.02 to 2.04) | 0.038 | |
| Medium (300–999 cases) | 1.18 (0.90 to 1.54) | 0.23 | 1.22 (0.87 to 1.72) | 0.26 | |
| High workload (>175 cases per radiologist per annum, vs less than this) | 1.52 (1.22 to 1.89) | 0.017 | 1.41 (1.02 to 1.93) | 0.032 | |
| Use of purgation combined with tagging (vs either alone) | 1.14 (0.95 to 1.38) | 0.16 | 1.12 (0.85 to 1.48) | 0.40 |
*Probablility value for the Wald z-score. Italic values are significant at the 5% level.
CTC, CT colonography.