Table 3.

Comparison of ONSD Variation caused by pneumoperitoneum between the study groups.

	Group 1:P = 10 cmH2O	Group 2:P = 12 cmH2O	Group 3:P = 14 cmH2O	p value
Difference between ONSD measurement before pneumoperitoneum and at the 15th min of pneumoperitoneum
Left eye, mm; mean ± SEM	0.050 ± 0.082	0.196 ± 0.018	0.376 ± 0.218	p < 0.001*, a, ¥, β, €
Right eye, mm; mean ± SEM	0.050 ± 0.177	0.134 ± 0.234	0.456 ± 0.274	p < 0.001*, a, ¥, β, €
Difference between ONSD measurements before pneumoperitoneum and at the 30th min of pneumoperitoneum
Left eye, mm; mean ± SEM	0.053 ± 0.190	0.206 ± 0.237	0.463 ± 0.363	p < 0.001*, a, ¥, β, €
Right eye, mm; mean ± SEM	0.060 ± 0.282	0.165 ± 0.239	0.480 ± 0.304	p < 0.001*, a, ¥, β, €
Difference between ONSD measurements before pneumoperitoneum and after pneumoperitoneum
Left eye, mm; mean ± SEM	0.003 ± 0.182	0.048 ± 0.241	0.010 ± 0.322	p: 0.342a
Right eye, mm; mean ± SEM	0.010 ± 0.193	0.020 ± 0.250	0.040 ± 0.347	p: 0.423a

ONSD: optic nerve sheath diameter, a: One-way ANOVA test, *: p < 0.05, ¥: Group I & Group II = p < 0.05,β: Group I & Group III = p < 0.05, €: Group II & Group III = p < 0.05.