Fig. 6.
Cumulative sum (CUSUM) graph of unilateral biportal endoscopy unilateral laminotomy bilateral decompression.
CUSUM= 163.19249+28.77753 ×n+1.33211 ×n2-0.07247 ×n3+1.17327e-4×n4+4.12196e-5×n5-8.26555e-7×n6+6.36981e-9×n7-1.77889e-11×n8
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