The mean ( SD ) number of hypoglycemic events per patient reporting hypoglycemia was lower with saxagliptin + metformin versus glipizide + metformin through weeks 52 ( 1.5 [ SD 0.88 ] vs 4.8 [ SD 4.9 ] , respectively ) and 104 ( 1.6 [ SD 0.99 ] vs 5.4 [ SD 5.8 ] ) .