In overweight group , fasting blood glucose ( FBG ) after metformin treatment showed greater decline compared to acarbose group at 48 weeks [ -1.73 ( -1.99 to -1.46 ) vs. -1.37 ( -1.61 to -1.12 ) , P < 0.05 ) , however the decrease of 2 h post-challenge blood glucose ( PBG ) after acarbose treatment at 48 weeks was bigger compared to metformin group [ -3.34 ( -3.83 to-2 .84 ) vs. -2.35 ( -2.85 to -1.85 ) , P < 0.01 ] .