I found this study (wish there was a greater sample size):
Outcome Analysis of Early Laparoscopic Sleeve Gastrectomy Experience. Sucandy et al. JSLS (2013) 17:602-606
http://laparoscopy.blogs.com/jslsjournal/JSLSPDFs/JSLSVol17No4.pdf
Sleeve Gastrectomy % EBW lost:
1 mo: 18%
3 mo: 33%
6 mo: 44%
9 mo: 51%
12 mo: 58%
18 mo: 62%
Erin Thompson, MPH, RD, LD, CDE
Registered Dietitian
Trinity Clinic Bariatric Surgery
CHRISTUS® Trinity Mother Frances Health System
Tel 903.606.5966
erin.thompson@tmfhc.org