Table 1. Patients Characteristics ^a,b,c.

Variable	Group 1	Group 2	Group 3	Group 4
Age, y c	37.4 ± 9.2	32.7 ± 8.3	35.3 ± 7.3	36 ± 14.4
Weight, kg d	81.4 ± 9.2	78.0 ± 7.4	73.5 ± 2.9	73.9 ± 8.3
Height, cm d	172.4 ± 9.2	173.1 ± 8.5	174.6 ± 5.3	169.4 ± 7.9
Duration of operation, min d	109 ± 28.9	97.3 ± 19.9	98.3 ± 25.2	101.3 ± 24.7
ASA (I/II)	17/13	12/18	13/17	16/14

^a Abbreviation: ASA, American society of anesthesiologist.

^b Data are presented as mean ± SD.

^c Sample size was 30.

^d There was no significant difference between the groups .