Table 2.

Model of Propensity for Exposure to Any of the Three Antieplileptic Drugs for Patients with Bipolar Disorder in the Collaborative Depression Study^a

Variable	Odds Ratio	95% CI	z	p
Hollingshead socioeconomic status scaleb
I or II	1.00
III	1.52	0.62–3.75	0.91	0.364
IV	0.64	0.23–1.79	−0.85	0.394
V	0.36	0.13–1.02	−1.92	0.055
Marital status
Married	1.00
Never married	2.25	1.04–4.84	2.07	0.038
Divorced, separated, or widowed	0.97	0.44–2.14	−0.08	0.934
Site
New York	1.00
St. Louis	2.94	0.94–9.16	1.86	0.063
Boston	1.67	0.43–6.53	0.74	0.459
Iowa City	5.93	1.85–18.95	3.00	0.003
Chicago	3.28	1.08–9.97	2.10	0.036
Gender
Female	1.00
Male	1.72	0.87–3.40	1.55	0.121
Severity of mania	3.83	2.39–6.14	5.59	<0.001
Severity of hypomania	5.93	2.09–16.86	3.34	0.001
Antipsychotics in week prior to exposure interval	0.50	0.32–0.79	−2.97	0.003
Suicide attempt between intake and start of exposure interval	1.66	0.93–2.95	1.71	0.086
Age	1.06	1.03–1.08	4.68	<0.001
Cumulative morbidity	1.01	1.00–1.02	1.61	0.108

^aThe antiepileptics included in the analysis were carbamazepine, lamotrigine, and valproate. Analyses included 199 participants with 1,077 exposure intervals.

^bThe scale ranges from I (higher status) to V (lower status).