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. 2022 Aug 15;19(3):792–804. doi: 10.14245/ns.2143116.558

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Copyright © 2022 by the Korean Spinal Neurosurgery Society

This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 8. — Risk-adjusted cumulative sum analysis (RA-CUSUM) graph of the cohort. UBE-ULBD, unilateral biportal endoscopy unilateral laminotomy bilateral decompression; UBE-LD, unilateral biportal endoscopy lumbar discectomy.

RA-CUSUM=0.12342+0.05918 ×n+0.00397 ×n²-1.45566e^-4×n³+2.55111e^-6×n⁴-2.61582e^-8×n⁵+1.53628e^-10×n⁶-4.74322e^-13×n⁷+5.95452e^-16×n⁸