Table 3.
Logistic regression predicting correct understanding of residual risk
| AOR | 95% CI | Wald | P value* | |
| Intercept | 0.61 | 0.29 to 1.31 | 1.58 | 0.209 |
| Residual risk | ||||
| Control | 0.56 | 0.34 to 0.95 | 4.70 | 0.030 |
| NHS T&T (reference) | ||||
| Elaborated T&T | 3.25 | 1.64 to 6.42 | 11.50 | 0.001 |
| Elaborated T&T+infographic | 5.16 | 2.47 to 10.82 | 18.94 | <0.001 |
| Post-test result behaviours | ||||
| Without (reference) | ||||
| With | 0.81 | 0.48 to 1.36 | 0.65 | 0.421 |
| Residual risk* post-test result behaviours | ||||
| NHS T&T * with (reference) | ||||
| Control * with | 0.65 | 0.32 to 1.33 | 1.38 | 0.240 |
| Elaborated T&T * with | 0.95 | 0.38 to 2.37 | 0.01 | 0.907 |
| Elaborated T&T+infographic * with | 0.77 | 0.29 to 2.04 | 0.27 | 0.605 |
| Gender† | ||||
| Male (reference) | ||||
| Female | 1.06 | 0.78 to 1.43 | 0.13 | 0.716 |
| Age (years) | ||||
| 18–24 | 1.76 | 0.93 to 3.33 | 3.07 | 0.080 |
| 25–34 | 1.45 | 0.85 to 2.46 | 1.87 | 0.172 |
| 35–44 | 1.56 | 0.91 to 2.65 | 2.66 | 0.103 |
| 45–54 | 1.74 | 1.03 to 2.91 | 4.35 | 0.037 |
| 55–64 | 1.68 | 1.04 to 2.73 | 4.41 | 0.036 |
| 65+ (reference) | ||||
| Education | ||||
| GCSE or equivalent (reference) | ||||
| A-level or equivalent | 1.82 | 1.18 to 2.80 | 7.27 | 0.007 |
| Undergraduate | 2.73 | 1.82 to 4.11 | 23.29 | <0.001 |
| Postgraduate | 4.95 | 2.85 to 8.61 | 32.12 | <0.001 |
| Ethnicity | ||||
| White British (reference) | ||||
| White other | 0.81 | 0.47 to 1.41 | 0.53 | 0.465 |
| Asian | 0.61 | 0.34 to 1.09 | 2.83 | 0.093 |
| Black | 0.33 | 0.15 to 0.71 | 7.94 | 0.005 |
| Mixed | 0.36 | 0.15 to 0.91 | 4.70 | 0.030 |
| Other | 0.64 | 0.12 to 3.54 | 0.26 | 0.613 |
| Location | ||||
| London (reference) | ||||
| Northern Ireland | 1.12 | 0.27 to 4.57 | 0.02 | 0.876 |
| Scotland | 0.82 | 0.41 to 1.63 | 0.33 | 0.567 |
| Wales | 0.62 | 0.28 to 1.40 | 1.31 | 0.252 |
| South England | 1.08 | 0.63 to 1.83 | 0.08 | 0.784 |
| Midlands | 1.46 | 0.84 to 2.54 | 1.76 | 0.185 |
| North England | 0.86 | 0.51 to 1.46 | 0.32 | 0.574 |
| Numeracy | ||||
| Incorrect (reference) | ||||
| Correct | 1.69 | 1.17 to 2.45 | 7.85 | 0.005 |
*Significant p values are shown in bold.
†To ensure meaningful comparisons between genders, participants who reported their gender as ‘non-binary’ (n=1) or ‘prefer not to say’ (n=2) were excluded from the logistic regression analysis given low numbers in each group. When included in the analysis, their understanding of residual risk was not significantly different from the reference category (male) nor did this alter the significance or direction of the other effects or analyses.