Table 2.

Impact of changing the minimum episode length for hypomania for patients with bipolar disorder

	Hypomanic episode minimum length								% Change
	4 days		3 days		2 days		1 day
	N	%	N	%	N	%	N	%	4–2 day	4–1 day
All patients (N = 393)
Mean percent days in hypomanic episode		4.5		5.9		8.2		10.6	82	136
Mean percent days in depressed episode		8.2		8.0		8.0		7.3	−2	−11
Number of hypomanic episodes	305		491		863		2,164		183	610
Number of depressed episodes	303		293		289		264		−5	−13
Number of patients with hypomanic episodes	102	26	145	37	190	48	271	69	86	166
Number of patients with depressed episodes	113	29	114	29	114	29	108	28	1	−4
All hypomanic days (N = 6,188)
Hypomanic days in hypomanic episode	2,699	44	3,356	54	4,169	67	6,188	100	54	129
Hypomanic days not in hypomanic episode	3,489	56	2,832	46	2,019	33	0	0	−42	−100
All depressed days (N = 15,699)
Depressed days in depressed episode	5,988	38	5,901	38	5,839	37	5,578	36	−2	−7
Depressed days not in depressed episode	9,711	62	9,798	62	9,860	63	10,121	64	2	4
All hypomanic days bipolar I (N = 3,772)
Hypomanic days in hypomanic episode	1,650	44	2,046	54	2,531	67	3,772	100	53	126
Hypomanic days not in hypomanic episode	2,122	56	1,726	46	1,241	33	0	0	−42	−100
All hypomanic days bipolar II (N = 2,416)
Hypomanic days in hypomanic episode	1,049	43	1,310	54	1,638	68	2,416	100	56	130
Hypomanic days not in hypomanic episode	1,367	57	1,106	46	778	32	0	0	−43	−100