statistical analysis , which included , t test , chi square test of association , and wilcoxon test , showed that the only baseline characteristic which differed between the two patient groups in respect to age at operation , age at testing , and preoperative physiological variables ( level of cyanosis , weight , oxygen saturation , and hemoglobin concentration ) was weight ( p = 0.03 ) .
C1521970
characteristic
C0005910
weight