Table 1.

Demographic data and duration of surgery ^a

	MIS group (n = 20)	CON group (n = 20)
No. of females/males	10/10	13/7
Age, years	62 (6)	66 (7)
Weight, kg	83 (15)	87 (24)
Height, cm	170 (9)	165 (23)
BMI	29 (4)	28 (4)
ASA, I / II / III b	9/11/0	7/13/0
Operation time, min	79 (8)	73 (8)

^a Values are mean (SD), except for ASA and the number of females/males where the number of patients is shown.

^b ASA physical status I: normal health; II: systemic disease with no limited activity; III: systemic disease with limited activity.

BMI: body mass index;

MIS: minimally invasive surgery;

CON: conventional exposure.