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. 2017 Feb 1;7(1):54–58. doi: 10.1055/s-0036-1583943

Fig. 1.

Fig. 1

Scatterplot showing the learning curve of microendoscopic decompression surgery for lumbar spinal canal stenosis as depicted by operating time per level. When the approximate curve was determined with a natural logarithmic function, its contribution rate (R 2) was 0.20.