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Table 2 Functional outcome measures and post hoc test results

From: Does minimally invasive transforaminal lumbar interbody fusion (MIS-TLIF) influence functional outcomes and spinopelvic parameters in isthmic spondylolisthesis?

  Baseline Postoperative Test* p value (Sig.)
6 weeks 6 months Final
Visual Analogue Scale (VAS) for back
Mean ± SD 8.42 ± 0.58 3.58 ± 0.65 2.17 ± 0.38 1.79 ± 0.88 62.074* < 0.001 (HS)
Median (range) 8 (7–9) 3.5 (3–5) 2 (2–3) 1.5 (1–3)
Visual Analogue Scale (VAS) for leg
Mean ± SD 7.46 ± 0.98 3.33 ± 0.48 1.25 ± 0.44 1.00 ± 1.59 66.792* < 0.001 (HS)
Median (range) 7 (6–9) 3 (3–4) 1 (1–2) 1 (0–8)
Oswestry Disability Index (ODI)%
Mean ± SD 52.21 ± 6.79 17.54 ± 1.25 14.04 ± 2.35 15.71 ± 9.95 59.484* < 0.001 (HS)
Median (range) 51 (42–63) 18 (15–19) 14 (10–19) 14.5 (10–61)
Post hoc test results
  Preoperative versus 6 weeks Preoperative versus 6 months Preoperative versus final 6 weeks versus 6 months 6 weeks versus final 6 months versus final
Visual Analogue Scale (VAS) for back
Test‡ − 4.451 − 4.373 − 4.323 − 4.092 − 4.011 − 1.806
p value (Sig.) < 0.001 (HS) < 0.001 (HS) < 0.001 (HS) < 0.001 (HS) < 0.001(HS) 0.071
Visual Analogue Scale (VAS) for Leg
Test‡ − 4.344 − 4.328 − 4.319 − 4.518 − 3.7 − 2.337
p value (Sig.) < 0.001 (HS) < 0.001 (HS) < 0.001 (HS) < 0.001 (HS) < 0.001 (HS) 0.019
Oswestry Disability Index (ODI)
Test‡ − 4.289 − 4.29 − 4.26 − 3.75 − 3.189 − 0.241
p value (Sig.) < 0.001 (HS) < 0.001 (HS) < 0.001 (HS) < 0.001 (HS) 0.001 (S) 0.809
  1. *Friedman’s test was used, ‡ Wilcoxon signed-rank test, p < 0.05 is significant and Sig.: Significance