Table 4. Pre- and post-BDI scores by surgery type.

Surgery	Pre-BDI	Post-BDI	P-valuea
GB	11.1±8.6	4.5±4.0	0.0001
BPD/DS	11.7±9.3	3.3±4.4	0.0001
LAGB	8.3±6.9	3.7±2.8	0.04
Sleeve	10.5±8.9	5.5±5.9	0.01
Total	10.6±8.5	4.4±4.4	0.0001

Abbreviations: ANOVA, analysis of variance; BDI, Beck Depression Inventory; BPD/DS, biliopancreatic diversion with duodenal switch; GB, gastric bypass; LAGB, adjustable gastric band.

Paired t-test for each group pre- and post-surgery. Pre-surgery P=0.65 by ANOVA test; post-surgery P=0.44 by ANOVA test.