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Meta-analysis of the NDI score comparing hybrid surgery with ACDF by a fixed effects model. After exclusion of high heterogeneity (I2 decreased to 0.0%), 6 studies were analyzed by a fixed effects model, indicating there was no significant difference in NDI between the hybrid surgery and ACDF at 2-year follow-up (P = 0.093, the diamond overlaps the null line). ACDF = anterior cervical discectomy and fusion, NDI = neck disability index.
