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. 2018 Nov 27;10:1773–1786. doi: 10.2147/CLEP.S178163

Table 2.

Results from a linear regression model that adjusted for sites and confounders as individual covariates (Model 1) from 36 health systems participating in the PCORnet Bariatric Study

Variablea Parameter estimate SE

Pooled individual-level data analysis Distributed regression Pooled individual-level data analysis Distributed regression

Exposureb −0.05312 −0.05312 0.00105 0.00105
Age
 20–44 −0.01662 −0.01662 0.00106 0.00106
 45–64 Reference Reference Reference Reference
 65–80 0.01339 0.01339 0.00218 0.00218
Male sex 0.02162 0.02162 0.00133 0.00133
Race
 White Reference Reference Reference Reference
 Black 0.02873 0.02873 0.00130 0.00130
 Other 0.00883 0.00883 0.00153 0.00153
Hispanic ethnicity 0.00227 0.00227 0.00147 0.00147
Year of procedure
 2005–2009 −0.00319 −0.00319 0.00218 0.00218
 2010 −0.00301 −0.00301 0.00169 0.00169
 2011 −0.00326 −0.00326 0.00144 0.00144
 2012 Reference Reference Reference Reference
 2013 0.00384 0.00384 0.00141 0.00141
 2014 0.00569 0.00569 0.00145 0.00145
 2015 0.03664 0.03664 0.00288 0.00288
 Comorbidity scorec,d 0.00576 0.00576 0.00069243 0.00069243
 Baseline weightc,d −0.00025096 −0.00025096 0.00000921 0.00000921
 Baseline weight proximityd,e 0.00012330 0.00012330 0.00001430 0.00001430
 Smokingc −0.00657 −0.00657 0.00163 0.00163
 Days of hospitalizationc,d 0.00017944 0.00017944 0.00006129 0.00006129
Diagnosis ofc
 Anxiety 0.00036721 0.00036721 0.00119 0.00119
 Deep vein thrombosis 0.00245 0.00245 0.00530 0.00530
 Depression 0.00412 0.00412 0.00107 0.00107
 Diabetes 0.01914 0.01914 0.00107 0.00107
 Dyslipidemia 0.00169 0.00169 0.00103 0.00103
 Eating disorder −0.00247 −0.00247 0.00236 0.00236
 GERD −0.00132 −0.00132 0.00095329 0.00095329
 Hypertension 0.01454 0.01454 0.00124 0.00124
 Infertility 0.00842 0.00842 0.00521 0.00521
 Kidney disease 0.00059350 0.00059350 0.00176 0.00176
 NAFLD −0.00652 −0.00652 0.00150 0.00150
 Osteoarthritis −0.00253 −0.00253 0.00337 0.00337
 PCOS 0.00118 0.00118 0.00212 0.00212
 Psychosis 0.00006296 0.00006296 0.00226 0.00226
 Pulmonary embolism 0.00722 0.00722 0.00414 0.00414
 Sleep apnea −0.00153 −0.00153 0.00098117 0.00098117
 Substance use disorder −0.00729 −0.00729 0.00310 0.00310

Notes:

a

Also adjusted for sites (35 indicator variables; results not shown for brevity);

b

Roux-en-Y gastric bypass vs sleeve gastrectomy;

c

measured in the year prior to the surgery;

d

modeled as a continuous variable;

e

number of days between baseline weight measurement and index procedure.

Abbreviations: GERD, gastroesophageal reflux disease; NAFLD, nonalcoholic fatty liver disease; PCORnet, National Patient-Centered Clinical Research Network; PCOS, polycystic ovarian syndrome; SE, standard error.