. Author manuscript; available in PMC: 2026 Jun 23.

Published in final edited form as: Surgery. 2012 Sep 6;152(4):758–767. doi: 10.1016/j.surg.2012.07.023

Table I.

Demographics and comorbid disease

	DS/BD (N = 173^*)	RYGB (N = 136^†)	P value
Age (yrs; mean ± SD)	45.2 ± 11.3	48.2 ± 10.8	.01
Female (%)	78.0	78.7	.89
Preoperative BMI (kg/m²; mean ± SD)^‡	51.6 ± 9.4	50.0 ± 9.1	.12
Duration of follow-up (yrs; mean ± SD)	3.7 ± 1.6	6.2 ± 1.8	<.05
% Open (n)	63.6 (110)	17.6 (24)	<.01
% Type 2 diabetes (n)	35.8 (62)	30.9 (42)	.36
% Hypertension (n)	57.8 (100)	56.6 (77)	.83
% Hyperlipidemia (n)	54.3 (94)	44.1 (60)	.08
% GERD (n)	43.9 (76)	31.6 (43)	.03

One hundred seventy-eight total DS/BD patients accounted for, with 5 deaths.

^†

One hundred thirty-nine total RYGB patients accounted for, with 3 deaths.

^‡

t test performed based on the geometric natural log of the means.

BMI, Body mass index; DS/BD, duodenal switch/biliopancreatic diversion; GERD, gastroesophageal reflux disease; RYGB, Roux-en-Y gastric bypass; SD, standard deviation.