Impact of WC on patient-reported outcome measures.
| Outcome Measure | Preop—6 wk | Preop—12 wk | Preop—6 mo | Preop—1 y | Overall |
| VAS back | |||||
| Non-WC | 63.9% (53) | 77.6% (59) | 72.0% (54) | 77.1% (37) | 85.9% (79) |
| WC | 52.0% (13) | 50.0% (12) | 60.0% (15) | 61.5% (8) | 68.9% (20) |
| P valuea | 0.286 | 0.009 | 0.261 | 0.258 | 0.040 |
| VAS leg | |||||
| Non-WC | 61.5% (51) | 71.4% (57) | 68.0% (52) | 58.3% (28) | 78.3% (72) |
| WC | 40.0% (10) | 45.8% (11) | 48.0% (12) | 61.5% (8) | 62.0% (18) |
| P valuea | 0.058 | 0.021 | 0.073 | 0.835 | 0.082 |
| ODI | |||||
| Non-WC | 40.5% (34) | 44.9% (35) | 61.8% (47) | 66.7% (32) | 75.0% (69) |
| WC | 24.0% (6) | 16.7% (4) | 36.0% (9) | 46.1% (6) | 43.3% (12) |
| P valuea | 0.133 | 0.013 | 0.024 | 0.176 | 0.001 |
| SF-12 PCS | |||||
| Non-WC | 33.8% (26) | 52.9% (36) | 69.3% (43) | 75.9% (41) | 73.9% (68) |
| WC | 18.1% (4) | 30.4% (7) | 22.2% (4) | 53.3% (8) | 48.3% (14) |
| P valuea | 0.161 | 0.062 | <0.001 | 0.088 | 0.010 |
| PROMIS-PF | |||||
| Non-WC | 15.6% (12) | 37.1% (23) | 50.8% (32) | 57.9% (33) | 59.8% (55) |
| WC | 9.5% (2) | 22.2% (4) | 43.7% (7) | 25.0% (3) | 37.9% (11) |
| P valuea | 0.482 | 0.227 | 0.615 | 0.034 | 0.039 |
The following MCID values derived from Copay et al; VAS back = 1.2, VAS leg = 1.6, ODI = 12.8; or Parker et al; SF-12 = 4.0; PROMIS MCID values derived from Hung et al PROMIS-PF = 8.0.
Data presented as % (n). Boldface indicates statistical significance.
aP value was calculated for each category using logistic regression.
MCID, minimum clinically important difference; PROMIS-PF, Patient-Reported Outcome Measurement Information System physical function; SF-12 PCS, 12-Item Short Form Physical Component Summary; VAS, visual analog scale; WC, workers’ compensation.