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

Table 3.

Surgical outcomes of exposure time (s, mean ± SD)

Groups	L₃/L₄ level	L₄/L₅ level	L₅/S₁ level
Group A	17.21 ± 2.91	20.64 ± 3.84	26.07 ± 3.17
Group B	14.64 ± 1.60	16.43 ± 2.47	22.50 ± 2.68
t value	2.534	6.118	2.980
P value	0.025	<0.01	0.011