Table 4.

Risk of experiencing a non-puerperal episode of illness for clinical factors based on proportional hazards model controlling for time since index PP episode

Variable	B	SE	Hazard ratio	95% CI	p-value
Age at index PP episode (years)	0.10	0.2	1.10	1.05–1.15	0.01
Experienced psychiatric illness prior to index PP (yes)	0.81	0.25	2.24	1.39–3.61	0.01
Had a family history of a mood disorder (yes)	0.55	0.27	1.73	1.03–2.91	0.04
Had a female relative with postpartum illness (yes)	0.68	0.38	1.97	0.93–4.17	0.07
Clinical presentation of index PP (mania or mixed)	0.22	0.36	1.25	0.62–2.51	0.54
Perplexity or confusion was present in index PP (yes)	0.08	0.24	1.08	0.68–1.71	0.75
Suicidal behaviors were present in index PP (yes)	0.18	0.24	1.20	0.75–1.92	0.45
Involuntarily detained for index PP (yes)	0.22	0.26	1.25	0.75–2.07	0.39

PP = postpartum psychosis; SE = standard error; CI = confidence interval.