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. 2020 Oct 19;12:161–170. doi: 10.2147/ORR.S272980

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GPI by KL Grade. GPI indicates Global Perceived Improvement (scale range, 0–100%). Patients with Kellgren–Lawrence (KL) grade 3 knee osteoarthritis (OA) reported significantly greater improvement at 1 month compared to those with KL grade 4 knee OA (* denotes P < 0.05). Error bars indicate standard deviation.