Table 1.

Baseline Characteristics of Bariatric Surgical Patients and Matched Non-Surgical Patients

	Surgical Patients (n=22198)	Matched Non-Surgical Patients (n=66427)	Standardized Difference
Female (%)	81.08	81.13	a
Age, mean (SD)	45.02 (11.08)	45.10 (11.05	0.01
Body Mass Index, mean (SD), kg/m2	44.84 (6.71)	44.37 (6.24)	0.07
Follow-up, mean (SD), months	47.07 (23.08)	41.19 (24.42)	0.24
Race/ethnicity
Non-hispanic white (%)	48.5	41.34
Hispanic (%)	30.55	32.22
African-American (%)	16.02	15.74
Asian (%)	1.42	2.36
Other (%)	3.5	8.35
Site (%)			a
Group Health Cooperative	4.65	4.63
Kaiser Permanente Southern Cal.	58.74	58.78
Kaiser Permanente Nouthern Cal.	27.61	27.65
Kaiser Permanente Northwest	2.03	2.02
Kaiser Permanente Colorado	6.97	6.92
Clinical Characteristicsb
Diabetes (%)	34.47	35.12	0.01
% of Patients with Diabetes on Insulin	30.78	29.01	0.03
% of Patients with Diabetes on Metformin	60.02	63.53	0.07
Hypertension (%)	60.28	60.06	0.005
Hyperlipidemia (%)	42.96	36.38	0.13
% of Patients with Hyperlipidemia on Statins	71.95	82.6	0.27
Coronary Artery Disease (%)	2.04	1.92	0.08
Smoker, ever (%)c	32.1	25.46	0.15
Nonalcoholic steatohepatitis (%)	2.93	1.32	0.12
Alcohol Abuse (%)	1.32	2.09	0.06
Peripheral Vascular Disease (%)	0.98	1.56	0.05
Cerebral Vascular Disease (%)	0.76	1.1	0.03
Use of Hormone Replacement Therapy
Estrogen Only (% of women)	3.12	2.08
Progesterone Only (% of women)	2.83	2.52
Combination (% of women)	1.83	1.26
Elixhauser, mean (SD)	1.72 (1.55)	1.61 (1.48)	0.07
Mammogram (%)	19.81	22.94	0.08
Bariatric Procedure Type (n,%)
Gastric Bypass	13545 (61.0%)
Sleeve Gastrectomy	6047 (27.2%)
Laproscopic adjustable band	1236 (5.6%)
Otherd	15 (0.1%)
Indeterminatee	1355 (6.1%)

^aCases and Controls matched exactly

^bAll clinical conditions were identified in the year prior to the index date

^cSmoking was only identified using ICD-9 codes

^dOther includes biliopancreatic diversion and vertical gastric banding

^eIndeterminate includes procedures for which more than one procedure type was coded for on the same day