Table 3.

The average Oswestry Disability Index (ODI) scores.

	ODI score (mean ± SD)	Test statistics*	Source of difference **
0	28.14 ± 1.81	χ2 = 93.078P < 0.001	0–1, 0–3, 0–6, 0–12 (P < 0.001)
1st month	18.59 ± 1.84		1–3 (P = 0.110), 1–6 (P = 0.038)
3rd month	18.00 ± 1.10		1–12 (P = 0.002), 3–6 (P = 0.295)
6th month	17.79 ± 1.01		3–12 (P = 0.003), 6–12 (P = 0.012)
12th month	17.35 ± 0.67

^*: Friedman variance analysis test statistical values.

^**: Bonferroni adjusted Wilcoxon signed-ranks test statistical values.