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. Author manuscript; available in PMC: 2021 May 1.
Published in final edited form as: Ann Surg. 2021 May 1;273(5):940–948. doi: 10.1097/SLA.0000000000003391

Table 1:

Baseline Characteristics of VSG vs. RYGB Patients - Pre and Post Matchinga

Pre-Match Post-Match
Variable RYGB % (n=1,167) VSG % (n=1,398) Standardized Differenceb RYGB % (n=922) VSG % (n=1,111) Standardized Differenceb
Age Group
18–39 y 14% 19% 16% 16%
40–49y 32% 32% 0.14 34% 34% 0.00
50–59y 40% 36% 40% 40%
60–64y 14% 13% 10% 10%
Female Sex 65% 65% 0.00 69% 64% −0.11
Non-Hispanic White Race/Ethnicityc 55% 52% −0.04 50% 52% −0.05
Educationc
< HS 1% 1% 1% 1%
HS Graduate 27% 27% 0.02 28% 27% 0.04
Some College 59% 59% 60% 59%
College Graduate 12% 12% 10% 13%
Missing 1% 1% 1% 1%
Region
West 26% 20% 22% 20%
South 42% 52% 0.15 47% 51% 0.10
Midwest 22% 19% 20% 20%
Northeast 10% 10% 11% 9%
Time Period
2010–12 47% 23% 0.52 27% 26% 0.02
2013–16 53% 77% 73% 74%
BMI (kg/m2) Category
30–39.9 18% 22% 20% 22%
40–49.9 43% 46% 0.18 47% 45% 0.05
50–59.9 20% 18% 19% 19%
≥60 3% 3% 2% 3%
Non-specific obesity 15% 10% 11% 10%
Missing 1% 1% 1% 1%
ACG Score ≥3c 25% 26% 0.01 21% 23% 0.06
Hypertensionc 69% 66% −0.06 66% 65% −0.02
Cardiovascular Diseasec 12% 12% −0.02 8% 11% 0.10
Mental Illnessc 16% 15% −0.03 14% 15% 0.02
Acute DM Complicationsc 18% 17% −0.04 9% 9% 0.00
Chronic Microvascular Complicationsc 21% 16% −0.13 11% 11% 0.00
Baseline Insulin Usersc 38% 26% −0.26 23% 23% 0.00
Baseline Metformin Only Usersc 28% 37% 0.19 40% 40% 0.00
a

We conducted coarsened exact matching on key predictors of diabetes remission: age group, baseline insulin use, baseline total diabetes medication burden (tertile of total MDD in the 6 months prior to surgery), and presence or absence of acute diabetes complications and chronic microvascular complications in the 6 months prior to surgery. Additionally, we exact matched on duration of enrollment after surgery to minimize bias introduced by differential loss to follow-up, and tertile of a propensity score for undergoing VSG vs. RYGB, based on sex, race, education, region, year group, BMI category, ACG score, and comorbidities.

b

Standardized differences are the difference in means between the intervention and control groups divided by the SD of the difference in means. Lower values indicate greater similarity between VSG and RYGB, and values <0.2 indicate minimal differences between groups.

c

for complete descriptions of how we constructed baseline variables, please refer to the methods section.