Impact of gender on minimal clinically important difference achievement.
| Minimal Clinically Important Difference | 6 wk | 12 wk | 6 mo | 1 y | 2 y | Overall |
| VAS arm | n = 49 | n = 42 | n = 39 | n = 15 | n = 5 | n = 71 |
| Women | 51.3% (20) | 44.7% (17) | 34.3% (12) | 29.4% (5) | 25.0% (2) | 64.4% (29) |
| Men | 38.7% (29) | 37.9% (25) | 44.3% (27) | 25.0% (10) | 18.8% (3) | 51.9% (42) |
| P valuea | 0.197 | 0.492 | 0.338 | 0.729 | 0.722 | 0.172 |
| VAS neck | n = 58 | n = 69 | n = 61 | n = 23 | n = 9 | n = 97 |
| Women | 43.2% (19) | 68.2% (30) | 64.1% (25) | 31.6% (6) | 33.3% (3) | 72.6% (37) |
| Men | 49.4% (39) | 55.7% (39) | 55.4% (36) | 43.6% (17) | 35.3% (6) | 70.6% (60) |
| P valuea | 0.510 | 0.185 | 0.382 | 0.380 | 0.920 | 0.807 |
| NDI | n = 54 | n = 63 | n = 62 | n = 28 | n = 14 | n = 91 |
| Women | 56.4% (22) | 71.1% (27) | 67.7% (23) | 58.8% (10) | 77.8% (7) | 75.0% (33) |
| Men | 43.8% (32) | 56.3% (36) | 67.2% (39) | 48.7% (18) | 46.7% (7) | 71.8% (56) |
| P valuea | 0.205 | 0.137 | 0.968 | 0.487 | 0.134 | 0.702 |
| SF-12 PCS | n = 26 | n = 42 | n = 29 | n = 16 | n = 12 | n = 76 |
| Women | 30.6% (11) | 39.1% (18) | 37.0% (10) | 35.3% (6) | 50.0% (7) | 50.8% (32) |
| Men | 25.0% (15) | 34.3% (24) | 48.7% (19) | 35.7% (10) | 35.7% (5) | 47.8% (44) |
| P valuea | 0.553 | 0.595 | 0.347 | 0.977 | 0.445 | 0.717 |
| PROMIS-PF | n = 19 | n = 22 | n = 24 | n = 15 | n = 19 | n = 42 |
| Women | 42.9% (9) | 60.0% (9) | 66.7% (10) | 50.0% (5) | 57.1% (8) | 72.0% (18) |
| Men | 37.0% (10) | 48.2% (13) | 63.6% (14) | 58.8% (10) | 61.1% (11) | 66.7% (24) |
| P valuea | 0.683 | 0.461 | 0.850 | 0.656 | 0.821 | 0.658 |
Note: Data presented as % (n). Boldface indicates statistical significance.
↵a P values calculated using χ 2 analysis.
Abbreviations: NDI, Neck Disability Index; PROMIS-PF, patient-reported outcome measure information system physical function; SF-12 PCS, 12-item short form survey physical composite score; VAS, visual analog scale.