Table 1: Demographic characteristics of patients in two magnesium sulfate and saline groups.

Variable Magnesium sulfate*Saline* value
( = 20)( = 20)

Age (yr)50.45 ± 5.7451.85 ± 5.390.431
Weight (Kg)76.85 ± 12.2176.05 ± 11.050.829
Duration of surgery (h)1.53 ± 0.23 1.55 ± 0.200.718

Data are mean ± SD.