Table 4

Significant predictors of change in postoperative depression.

Variable	Coefficient, ß	SE	95% CI		P Value^{^a}
6 wk
Mild PHQ-9	−4.48	0.94	−6.68	−2.93	<0.001
Moderate to severe PHQ-9	−8.13	1.17	−10.46	−5.80	<0.001
12 wk
Mild PHQ-9	−3.57	1.59	−6.77	−0.37	0.029
Moderate to severe PHQ-9	−10.08	1.97	−14.04	−6.11	<0.001
Private insurance	−5.49	1.72	−8.94	−2.04	0.002
Smoking	3.91	1.92	0.06	7.78	0.047
6 mo
Moderate to severe PHQ-9	−4.63	2.16	−9.00	−0.27	0.038

Abbreviation: PHQ-9, Patient Health Questionnaire-9.
↵a P values calculated using multiple linear regression analysis.