Table 3:

Minimally important differences at 3- and 6-month follow-up

Reliability (Cronbach α)Criterion for Meaningful ChangePatients Experiencing Meaningful Improvement (No.) (%)Patients Experiencing No Change (No.) (%)Patients Experiencing Meaningful Decline (No.) (%)
RMDI
    3 mo0.885.24 (4%)67 (74%)19 (21%)
    6 mo2 (2%)50 (71%)18 (25%)
EQ-5D
    3 mo0.560.31 (1%)74 (85%)12 (13%)
    6 mo2 (2%)57 (82%)10 (14%)
NRS
    3 moN/A2.038 (42%)41 (45%)11 (12%)
    6 mo29 (41%)34 (48%)7 (10%)
PF
    3 mo0.886.26 (8%)56 (82%)6 (8%)
    6 mo4 (9%)35 (81%)4 (9%)
PI
    3 mo0.914.57 (10%)41 (59%)21 (30%)
    6 mo5 (11%)26 (60%)12 (27%)
PB
    3 mo0.794.43 (4%)61 (85%)7 (9%)
    6 mo2 (4%)37 (86%)4 (9%)
  • Note:—PB indicates PROMIS Pain Behavior Scale; PF, PROMIS Physical Function Scale; PI, Pain Interference.