Table 4.
Absolute Risk Reduction (ARR) and the Number Needed to Treat (NNT) by study arm for all participants (54-70 years) and for participants aged 60-70 years.
| Arm | Overall (54-70 years) |
60-70 years |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Participation Rate (%) | ARR (%)a | 95% C.I. | NNTb | 95% C.I. | Participation Rate (%) | ARR (%)a | 95% C.I. | NNTb | 95% C.I. | |
| Control | 6.52 | - | - | - | - | 6.03 | - | - | - | - |
| Feedback | 8.36 | 1.84 | 1.32-2.35 | 54 | 42-75 | 8.10 | 2.07 | 1.39-2.75 | 48 | 36-71 |
| Minority Norms | 7.36 | 0.84 | 0.35-1.33 | 119 | 75-277 | 6.96 | 0.93 | 0.29-1.57 | 107 | 63-325 |
| Combined condition | 7.65 | 1.13 | 0.63-1.62 | 89 | 61-156 | 7.77 | 1.74 | 1.07-2.41 | 57 | 41-92 |
a
ARR = Absolute risk reduction represents the difference between the participation rate in the control and experimental arms.
b
NNT = Number needed to treat represents the average number of people who need to receive the intervention for one additional person to get screened. A lower NNT indicates a more effective intervention.