Perceived clarity of overdiagnosis information: descriptive statistics for categorical/ordinal variables, adjusted ORs, 95% CIs, p values for variables in the multivariable binary logistic regression model
| ‘How clear do you find this description of a risk of the test?’ n (%) | Adjusted OR, 95% CI; p value | ||||||
| Total | Extremely clear | Very clear | Moderately clear | Slightly clear | Not at all clear | Extremely/very clear | |
| Characteristic | (n=1616) | (n=148; 9.2%) | (n=542; 33.5%) | (n=592; 36.6%) | (n=173; 10.7%) | (n=161; 10.0%) | (vs Not/slightly/ moderately) |
| Overdiagnosis information | |||||||
| Breast screening text | 850 | 75 (8.8) | 321 (37.8) | 285 (33.5) | 81 (9.5) | 88 (10.4) | 1.43, 1.17 to 1.75; 0.001 |
| versus Prostate screening text | 766 | 73 (9.5) | 221 (28.9) | 307 (40.1) | 92 (12.0) | 73 (9.5) | |
| Gender | |||||||
| Male | 748 | 66 (8.8) | 228 (30.5) | 303 (40.5) | 81 (10.8) | 70 (9.4) | 0.92, 0.74 to 1.14; 0.447 |
| versus Female | 868 | 82 (9.4) | 314 (36.2) | 289 (33.3) | 92 (10.6) | 91 (10.5) | |
| Ethnicity | |||||||
| White British | 1229 | 116 (9.4) | 425 (34.6) | 447 (36.4) | 121 (9.8) | 120 (9.8) | 1.19, 0.92 to 1.54; 0.197 |
| versus Other ethnic groups | 387 | 32 (8.3) | 117 (30.2) | 145 (37.5) | 52 (13.4) | 41 (10.6) | |
| Marital status | |||||||
| Married or living as a couple | 987 | 92 (9.3) | 344 (34.9) | 355 (36) | 101 (10.2) | 95 (9.6) | 1.16, 0.93 to 1.45; 0.184 |
| versus single, widowed, divorced or separated | 629 | 56 (8.9) | 198 (31.5) | 237 (37.7) | 72 (11.4) | 66 (10.5) | |
| Highest level of education | Overall p-value: 0.482 | ||||||
| No formal qualifications | 275 | 24 (8.7) | 97 (35.3) | 107 (38.9) | 25 (9.1) | 22 (8.0) | 1.24, 0.86 to 1.79; 0.248 |
| Approximately Level 1, 2 or 3 | 858 | 68 (7.9) | 297 (34.6) | 312 (36.4) | 97 (11.3) | 84 (9.8) | 1.13, 0.87 to 1.46; 0.353 |
| versus Approximately Level 4 | 483 | 56 (11.6) | 148 (30.6) | 173 (35.8) | 51 (10.6) | 55 (11.4) | |
| Social class grade | Overall p value: 0.610 | ||||||
| Grade A or B | 351 | 41 (11.7) | 117 (33.3) | 122 (34.8) | 31 (8.8) | 40 (11.4) | 1.18, 0.85 to 1.64; 0.323 |
| Grade C1 or C2 | 786 | 71 (9.0) | 267 (34.0) | 298 (37.9) | 80 (10.2) | 70 (8.9) | 1.09, 0.85 to 1.40; 0.507 |
| versus Grade D or E | 479 | 36 (7.5) | 158 (33.0) | 172 (35.9) | 62 (12.9) | 51 (10.6) | |
| Personal diagnosis of cancer | |||||||
| Yes | 86 | 11 (12.8) | 36 (41.9) | 25 (29.1) | 6 (7.0) | 8 (9.3) | 1.34, 0.84 to 2.12; 0.218 |
| versus No | 1530 | 137 (9.0) | 506 (33.1) | 567 (37.1) | 167 (10.9) | 153 (10.0) | |
| Knows someone with cancer | |||||||
| Yes | 946 | 89 (9.4) | 348 (36.8) | 313 (33.1) | 97 (10.3) | 99 (10.5) | 1.23, 0.99 to 1.53; 0.060 |
| versus No | 670 | 59 (8.8) | 194 (29.0) | 279 (41.6) | 76 (11.3) | 62 (9.3) | |
| Previously read a screening leaflet | |||||||
| Yes | 907 | 101 (11.1) | 340 (37.5) | 298 (32.9) | 87 (9.6) | 81 (8.9) | 1.35, 1.04 to 1.74; 0.024 |
| versus No | 709 | 47 (6.6) | 202 (28.5) | 294 (41.5) | 86 (12.1) | 80 (11.3) | |
| Previously read an NHS screening website | |||||||
| Yes | 275 | 33 (12.0) | 105 (38.2) | 88 (32.0) | 23 (8.4) | 26 (9.5) | 0.97, 0.72 to 1.30; 0.815 |
| versus No | 1341 | 115 (8.6) | 437 (32.6) | 504 (37.6) | 150 (11.2) | 135 (10.1) | |
| Discussed screening with doctor/nurse | |||||||
| Yes | 535 | 67 (12.5) | 200 (37.4) | 172 (32.1) | 46 (8.6) | 50 (9.3) | 1.08, 0.83 to 1.39; 0.576 |
| versus No | 1081 | 81 (7.5) | 342 (31.6) | 420 (38.9) | 127 (11.7) | 111 (10.3) | |
| Previously read or heard similar information | |||||||
| Yes | 584 | 78 (13.4) | 239 (40.9) | 189 (32.4) | 49 (8.4) | 29 (5.0) | 1.77, 1.40 to 2.23; <0.0005 |
| versus No | 1032 | 70 (6.8) | 303 (29.4) | 403 (39.1) | 124 (12.0) | 132 (12.8) | |
Adjusted ORs and 95% CIs are relative to a stated reference category; p values<0.05 are in bold; all predictor variables are included in the model.