Self-reported perception of treatment effectiveness expressed as event rate (%) for each group, absolute risk increase, relative risk and number needed to treat*
| Time point (months) | Customised foot orthoses | Sham foot orthoses | Absolute risk of treatment success (95% CI) | Relative risk of treatment success (95% CI) | Number needed to treat (95% CI) |
|---|---|---|---|---|---|
| 1 | 47/55 (85.5) | 38/54 (70.4) | 0.15 (−0.01 to 0.30) | 1.21 (0.98 to 1.49) | 7 (−176 to 3) |
| 3 | 41/49 (83.7) | 38/50 (76.0) | 0.08 (−0.08 to 0.23) | 1.10 (0.90 to 1.34) | 13 (−12 to 4) |
| 6 | 38/47 (80.9) | 39/48 (81.3) | −0.04 (−0.16 to 0.15) | 1.00 (0.82 to 1.21) | −251 (−6 to 6) |
| 12 | 40/45 (88.9) | 40/45 (88.9) | 0.00 (−0.14 to 0.14) | 1.00 (0.31 to 3.22) | ∞ (−7 to 7) |
*Participants rated improvement on a five-point Likert scale of perception of treatment effectiveness, which was dichotomised according to success, where ‘success’ was defined as marked or moderate improvement, which were the two best scores on the scale.