Table 4.

Results from a linear regression model that adjusted for sites and confounders as both individual covariates and propensity score deciles (Model 3) 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	−0.05355	−0.05355	0.00108	0.00108
Age
20–44	−0.01668	−0.01668	0.00106	0.00106
45–64	Reference	Reference	Reference	Reference
65–80	0.01364	0.01364	0.00218	0.00218
Male sex	0.02189	0.02189	0.00134	0.00134
Race
White	Reference	Reference	Reference	Reference
Black	0.02917	0.02917	0.00132	0.00132
Other	0.00877	0.00877	0.00153	0.00153
Hispanic ethnicity	0.00218	0.00218	0.00148	0.00148
Year of procedure
2005–2009	−0.00372	−0.00372	0.00241	0.00241
2010	−0.00352	−0.00352	0.00187	0.00187
2011	−0.00348	−0.00348	0.00146	0.00146
2012	Reference	Reference	Reference	Reference
2013	0.00453	0.00453	0.00146	0.00146
2014	0.00683	0.00683	0.00157	0.00157
2015	0.03793	0.03793	0.00295	0.00295
Comorbidity scorec,d	0.00585	0.00585	0.00069368	0.00069368
Baseline weightc,d	−0.00025150	−0.00025150	0.00000922	0.00000922
Baseline weight proximityd,e	0.00012628	0.00012628	0.00001507	0.00001507
Smokingc	−0.00653	−0.00653	0.00163	0.00163
Days of hospitalizationc,d	0.00018276	0.00018276	0.00006130	0.00006130
Diagnosis ofc
Anxiety	0.00040061	0.00040061	0.00119	0.00119
Deep vein thrombosis	0.00272	0.00272	0.00530	0.00530
Depression	0.00403	0.00403	0.00107	0.00107
Diabetes	0.01859	0.01859	0.00115	0.00115
Dyslipidemia	0.00164	0.00164	0.00103	0.00103
Eating disorder	−0.00226	−0.00226	0.00236	0.00236
GERD	−0.00164	−0.00164	0.00097208	0.00097208
Hypertension	0.01451	0.01451	0.00124	0.00124
Infertility	0.00880	0.00880	0.00521	0.00521
Kidney disease	0.00055973	0.00055973	0.00176	0.00176
NAFLD	−0.00680	−0.00680	0.00150	0.00150
Osteoarthritis	−0.00244	−0.00244	0.00337	0.00337
PCOS	0.00127	0.00127	0.00212	0.00212
Psychosis	0.00003263	0.00003263	0.00226	0.00226
Pulmonary embolism	0.00757	0.00757	0.00415	0.00415
Sleep apnea	−0.00177	−0.00177	0.00098965	0.00098965
Substance use disorder	−0.00745	−0.00745	0.00310	0.00310
PS stratum 1	Reference	Reference	Reference	Reference
PS stratum 2	0.00180	0.00180	0.00204	0.00204
PS stratum 3	0.00362	0.00362	0.00207	0.00207
PS stratum 4	0.00058495	0.00058495	0.00211	0.00211
PS stratum 5	0.00731	0.00731	0.00217	0.00217
PS stratum 6	0.00056111	0.00056111	0.00223	0.00223
PS stratum 7	0.00508	0.00508	0.00231	0.00231
PS stratum 8	0.00383	0.00383	0.00242	0.00242
PS stratum 9	0.00516	0.00516	0.00257	0.00257
PS stratum 10	0.00336	0.00336	0.00285	0.00285

Notes:

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

^bRoux-en-Y gastric bypass vs sleeve gastrectomy;

^cmeasured in the year prior to the surgery;

^dmodeled as a continuous variable;

^enumber 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; PS, propensity score; SE, standard error.