Table I.

Demographics in four groups (n = 30).

Demographics	Group I	Group II	Group III	Group IV
Age, years	41 ± 6	42 ± 7	43 ± 6	42 ± 5
Weight, kg	54 ± 5	59 ± 8	58 ± 6	57 ± 7
Sex (male/female), n	12/1	11/19	10/20	12/18
ASA class (I/II), n	16/14	18/12	15/15	19/11

Data are expressed as mean ± SD or number (proportion). There was no significant difference with regard to demographics between the four groups.

ASA = American Society of Anesthesiologists.