Variability of activity patterns across mood disorders and time of day

BMC Psychiatry

Table 4 Comparison of the active morning and evening periods within diagnostic subgroups

DIAGNOSIS	ACTIVE EVENING VS. MORNING PERIODS	Wilcoxon signed-rank test
DIAGNOSIS	ACTIVE EVENING VS. MORNING PERIODS	Median difference	z statistic	Significance**
Unipolar Depression	Mean activity count per minute	−65	3.51	< 0.001
	SD* in % of mean activity count	11.82	2.35	0.019
	RMSSD* in % of mean activity	15.02	3.51	< 0.001
	Sample entropy	−0.059	1.07	0.284
Bipolar Depression	Mean activity count per minute	−31	2.35	0.019
	SD* in % of mean activity count	6.43	0.94	0.347
	RMSSD* in % of mean activity	8.20	1.02	0.308
	Sample entropy	0.083	0.47	0.638
Mania	Mean activity count per minute	0	0.06	0.955
	SD* in % of mean activity count	0.27	0.74	0.460
	RMSSD* in % of mean activity	2.37	0.85	0.394
	Sample entropy	−0.325	0.72	0.469
Mixed State	Mean activity count per minute	−40	0.31	0.753
	SD* in % of mean activity count	29.17	1.99	0.046
	RMSSD* in % of mean activity	17.76	0.94	0.345
	Sample entropy	−0.634	1.57	0.116

^* SD Standard Deviation, RMSSD Root Mean Square of Successive Differences
^**degrees of freedom by group: Unipolar Depression = 47; Bipolar Depression = 11; Mania = 15; Mixed States = 5

ISSN: 1471-244X