however , the sce base-line frequency of the smoking-exposed group , with an average of 7.7/cell , was significantly higher than that of the control group , with an average of 6.5/cell ( p less than 0.01 ) , and also than that of the exposed group with an average of 5.9/cell ( p less than 0.01 ) .
C0037211
sce
C0007634
cell