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Changes in the Korean Oswestry Disability Index (K-ODI) between groups D and N. The K-ODI significantly decreased in both the groups at 3 months compared to baseline (p < 0.001). There were significantly lower scores of K-ODI in group D at 2 months (p=0.023) and 3 months (p=0.019) than in group N. The error bar indicates the standard deviation. ∗Significant at p < 0.001 when compared to the baseline visual analog scale score. †Significant differences between the D and N groups.
