The endometrial thickness was ( 7.7 + / - 1.49 ) mm in group B , ( 8.2 + / - 1.54 ) mm in group C and ( 8.9 + / - 1.51 ) mm in group D , which were significantly different from ( 6.4 5 + / - 1.26 ) mm in the group A ( all P < 0.01 ) also there was a significant difference between group C and D ( P < 0.05 ) .