Table 1: Demographic data comparing cohorts.

SA = 74NA = 131

Age (years)51520.672
Male/female86.5/13.5%73.3/26.7%0.018
Preoperative BMI (kg/m2)46.246.20.901
LGB11 (14.9%)12 (9.2%)0.097
LSG22 (29.8%)50 (38.2%)0.081
RYGB41 (55.3%)69 (52.6%)0.095

SA: cohort with prior history of substance abuse.
NA: cohort with no prior history of substance abuse.
BMI: body mass index.
LGB: laparoscopic gastric banding.
LSG: laparoscopic sleeve gastrectomy.
RYGB: Roux-en-Y gastric bypass.
NS: not significant.