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. 2019 Jun 17;11(3):493–499. doi: 10.1111/os.12473

Table 1.

Surgical outcomes of puncture frequency (mean ± SD)

Groups L3/L4 level L4/L5 level L5/S1 level
Group A 3.14 ± 1.35 3.43 ± 1.65 4.71 ± 1.38
Group B 1.14 ± 0.36 1.36 ± 0.74 1.50 ± 0.76
t value 4.926 5.025 7.623
P value <0.01 <0.01 <0.01