Table 3.

Preoperative and postoperative ACA opening degree of three groups of patients (°) ($\overline{x}$ ± s).

Different numbers of laser shots
Time point	Group I (30–40)	Group II (40–50)	Group III (＞60)
Before surgery	7.4 ± 3.2	7.7 ± 5.4	7.2 ± 4.3
2 hours after surgery	18.3 ± 4.1	21.2 ± 2.3	22.9 ± 4.6
24 hours after surgery	20.2 ± 3.8	23.3 ± 4.7	24.6 ± 8.2