table 3.

Percent changes in fat and lean tissue mass after gastric bypass surgery

Region	0–6 Months	6–12 Months	0–12 Months
Whole body
Fat	−38 ± 9	−21 ± 13	50 ± 13
	(−62, −21)	(−45, 2)	(−79, −29)
Lean	−18 ± 6	−1 ± 5	−19 ± 7
	(−29, −6)	(−13, 11)	(−35, −4)
Extremities
Fat	−35 ± 13	−20 ± 12	−47 ± 15
	(−59, 21)	(−39, 7)	(−74, 4)
Lean	−14 ± 12	−2 ± 5	−17 ± 11
	(26, 40)	(−13, 16)	(−29, 33)
Trunk
Fat	−39 ± 14	−23 ± 17	−53 ± 16
	(−67, −7)	(57, 7)	(−84, −29)
Lean	−22 ± 11	−0.2 ± 7	−22 ± 12
	(−38, −0.5)	(−15, 17)	(−45, 2)
Abdomen
Fat	−42 ± 11	−25 ± 19	−56 ± 16
	(−67, −26)	(−62, 13)	(−87, −26)
Lean	−20 ± 9	2 ± 9	−18 ± 12
	(−38, 0.6)	(−12, 22)	(−40, 5)
Nonabdominal trunk
Fat	−37 ± 17	−22 ± 17	−50 ± 17
	(−69, 13)	(−55, 4)	(−83, −24)
Lean	−23 ± 13	−1 ± 8	−24 ± 14
	(−46, 3)	(−17, 14)	(−50, 4)

Data are percent tissue mass change during the indicated time periods, and are expressed as mean ± s.d. (minimum, maximum).