Table 3: Mean estimation of BMI, FPG, and HbA1c before and after metabolic surgery. Combined data from 18 existing bariatric studies.

Variable (# studies)Pre Means ± SE95% CIPost Means ± SE95% CI

BMI ( 𝑛 = 1 4 ), kg/m2 3 0 . 4 ± 0 . 9 8 (28.4, 32.3) 2 4 . 8 ± 0 . 3 3 (24.1, 25.5)
FPG ( 𝑛 = 1 2 ), mg/dL 2 0 3 . 5 ± 8 . 2 (187.4, 219.6) 1 1 2 . 5 ± 4 . 4 (103.9, 121.1)
HbA1c ( 𝑛 = 1 0 ), % 9 . 0 1 ± 0 . 2 2 (8.6, 9.5) 6 . 3 ± 0 . 1 4 (6.1, 6.6)

SE: standard error.