Table 6. . Unadjusted hazard ratios (ref = sertraline).

Drug	Change HR (95% CI)	Augmentation HR (95% CI)	All hospitalization HR (95% CI)
Bupropion	1.05 (1.00, 1.11)†	0.95 (0.92, 0.98)†	0.67 (0.63, 0.72)
Citalopram	1.33 (1.28, 1.38)†	1.23 (1.20, 1.26)†	1.11 (1.06, 1.16)†
Duloxetine	0.81 (0.77, 0.85)†	0.76 (0.73, 0.78)†	0.95 (0.90, 1.00)
Escitalopram	0.94 (0.90, 0.99)†	0.92 (0.89, 0.95)†	0.78 (0.74, 0.83)†
Fluoxetine	0.99 (0.93, 1.04)	1.03 (0.99, 1.06)	0.86 (0.81, 0.93)†
Mirtazapine	1.29 (1.24, 1.35)†	1.20 (1.17, 1.23)†	1.60 (1.53, 1.67)†
Paroxetine	1.24 (1.17, 1.32)†	1.24 (1.19, 1.29)†	0.82 (0.76, 0.89)†
Venlafaxine	1.07 (1.02, 1.14)†	1.20 (1.16, 1.24)†	0.83 (0.77, 0.89)†

^†Indicates statistical significance.

CI: Confidence interval; HR: Hazard ratio.