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a GS and VAS have a significant positive correlation (r = 0.628, P < 0.05). b GS and the JOA score have a significant negative correlation (r = −0.764, P < 0.05). c VAS and the JOA score have significant negative correlation (r = −0.717, P < 0.05). GS indicates grid score. VAS indicates visual analogue scale. JOA score indicates the Japanese Orthopaedic Association scoring system for low back pain
