Table 2.
Absolute event rates of success of global effect and comparisons between groups for dichotomous measure of success expressed as relative risk reductions and numbers needed to treat (NNT)
| Follow-up | No (%) moderately or markedly improved* | Between group differences (99% CI)† | |||||
|---|---|---|---|---|---|---|---|
| Foot orthoses | Flat inserts | Physiotherapy | Foot orthoses plus physiotherapy | Foot orthoses v flat inserts | Physiotherapy v foot orthoses | Foot orthoses plus physiotherapy v physiotherapy | |
| 6 weeks | 35/41 (85) | 23/40 (58) | 38/41 (93) | 38/42 (90) | 0.66 (0.05 to 1.17)‡; NNT 4 (2 to 51)‡† | 0.5 (−0.84 to 1.85); NNT 14 (−8 to 4) | −0.3 (−2.83 to 2.24); NNT −45 (−5 to 6) |
| 12 weeks | 34/42 (81) | 30/38 (79) | 34/41 (83) | 38/40 (95) | 0.1 (−0.99 to 1.2); NNT 50 (−5 to 4) | 0.1 (−1.06 to 1.25); NNT 51 (−5 to 4) | 0.71 (−0.44 to 1.87); NNT 8 (−13 to 3) |
| 52 weeks | 38/45 (84) | 30/41 (73) | 34/42 (81) | 35/43 (81) | 0.42 (−0.43 to 1.24); NNT 9 (−9 to 3) | −0.22 (−1.6 to 1.14); NNT −29 (−4 to 6) | 0.02 (−1.13 to 1.18); NNT 226 (−5 to 4) |
*Participants rated improvement on five point Likert scale of global effect.
†Positive point estimate favours first listed condition.
‡Significant at P=0.01.