Table 3.

Multivariate mediation model (n = 336): SBQ-R

Effect	Variable	Coeff.	SE	p
Total effect of surgery versus non-surgery on SBQ-R total score	c	0.708	0.292	0.015
Direct effect of surgery versus non-surgery on SBQ-R total score	c′	0.628	0.671	0.349
Total indirect effect of surgery versus non-surgery on SBQ-R total score	ab	0.080	0.625	0.898
Indirect effect at 2 years after surgery
IWQOL-Lite	a1–2 b1–2	0.191	0.453	0.674
PCS	a2–2 b2–2	0.593	0.281	0.035
MCS	a3–2 b3–2	−0.192	0.099	0.053
BMI	a4–2 b4–2	0.370	0.584	0.527
Type 2 Diabetes Status	a5–2 b5–2	0.091	0.167	0.584
Dyslipidemia Status	a6–2 b6–2	0.029	0.215	0.893
Hypertension Status	a7–2 b7–2	0.002	0.189	0.991
Indirect effect at 6 years after surgery
IWQOL-Lite	a1–6 b1–6	0.015	0.050	0.761
PCS	a2–6 b2–6	−0.057	0.060	0.341
MCS	a3–6 b3–6	0.088	0.060	0.143
BMI	a4–6 b4–6	−0.061	0.157	0.700
Type 2 Diabetes Status	a5–6 b5–6	0.006	0.069	0.925
Dyslipidemia Status	a6–6 b6–6	−0.013	0.052	0.811
Hypertension Status	a7–6 b7–6	0.016	0.032	0.606
Indirect effect at 2 and 6 years after surgery
IWQOL-Lite	a1–2 d1 b1–6	0.000	0.033	0.999
PCS	a2–2 d2 b2–6	0.048	0.045	0.282
MCS	a3–2 d3 b3–6	0.021	0.015	0.176
BMI	a4–2 d4 b4–6	0.028	0.088	0.751
Type 2 Diabetes Status	a5–2 d5 b5–6	0.013	0.142	0.926
Dyslipidemia Status	a6–2 d6 b6–6	−0.039	0.148	0.794
Hypertension Status	a7–2 d7 b7–6	0.115	0.144	0.426

SBQ-R = Suicide Behaviors Questionnaire – Revised; SF-36 MCS = Short-Form 36 Mental Component Summary score; SF-36 PCS = Short-Form 36 Physical Component Summary score; IWQOL-Lite = Impact of Weight on Quality of Life-Lite; BMI = body mass index