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Table 5 Outcome measurement: preoperative and six months post-operative; achievement of change thresholds

From: Predictors of substantial improvement in physical function six months after lumbar surgery: is early post-operative walking important? A prospective cohort study

Outcome Outcome measure Baseline
mean (SD)
Six months
mean (SD)
Difference in mean (95%CI) t-statistic, p-value MCID
N (%)
SCB
N (%)
Physical function ODQ 44.14 (16.35) 22.37 (17.43) 21.77 (18.44–25.10) t = 15.97, p = < 0.01 142 (71%) 102 (51%)
SF-36 (PCS) 32.89 (7.07) 43.74 (10.03) −10.85 (−9.12 - -12.60) t = 15.10, p = < 0.01 139 (72%) 127 (66%)
Back Pain NRPS 5.75 (2.78) 2.88 (2.61) 2.87 (2.33–3.40) t = 12.52, p = < 0.01 127 (64%) 107 (54%)
Leg Pain NRPS 5.90 (3.02) 2.25 (2.66) 3.57 (3.08–4.22) t = 14.14, p = < 0.01 134 (68%) 114 (58%)
  1. MCID Minimal Clinically Important Difference, SCB Substantial Clinical Benefit, ODQ Oswestry Disability Questionnaire, SF-36 (PCS) Short Form 36 Physical Component Summary, NRPS Numerical Pain Rating Score