Table 2 Participants obtaining 30% and 50% improvement in outcomes: risk difference (RD) and number needed to treat (NNT)*
Improvement criterion | SMT (n = 36) | LM (n = 39) | adjusted RD (95% CI) | P | adjusted NNT (95% CI worst to best) | |
|---|---|---|---|---|---|---|
Cervicogenic headache pain scale †| ||||||
30% | 12 wk | 47% | 38% | 20% (2, 37) | .025 | 5.1 (40, 2.7) |
| Â | 24 wk | 58% | 49% | 17% (2, 33) | .028 | 5.8 (54, 3.1) |
50% | 12 wk | 42% | 23% | 26% (8, 45) | .005 | 3.8 (13, 2.2) |
| Â | 24 wk | 42% | 23% | 27% (8, 46) | .006 | 3.8 (13, 2.2) |
Cervicogenic headache number (in last 4 wk) | ||||||
30% | 12 wk | 72% | 51% | 23% (6, 40) | .007 | 4.3 (16, 2.5) |
| Â | 24 wk | 78% | 62% | 14% (1, 27) | .040 | 7.2 (152, 3.7) |
50% | 12 wk | 64% | 46% | 21% (0, 43) | .048 | 4.7 (442, 2.4) |
|  | 24 wk | 61% | 51% | 14% (-2, 30) | .094 | 7.2 (-42, ± ∞, 3.3) |
Cervicogenic headache disability scale †| ||||||
30% | 12 wk | 64% | 51% | 15% (-9, 39) ‡ | .226 | 6.7 (-3.5, ± ∞, 2.6) |
|  | 24 wk | 61% | 64% | -7% (-29, 15) | .553 | -15 (-11, ± ∞, 6.5) |
50% | 12 wk | 64% | 36% | 29% (6, 52) ‡ | .015 | 3.5 (17, 1.9) |
|  | 24 wk | 56% | 38% | 20% (-1, 42) | .061 | 4.9 (-105, ± ∞, 2.4) |