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

From: Variability of activity patterns across mood disorders and time of day

DIAGNOSIS ACTIVE EVENING VS. MORNING PERIODS Wilcoxon signed-rank test
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
  1. * SD Standard Deviation, RMSSD Root Mean Square of Successive Differences
  2. **degrees of freedom by group: Unipolar Depression = 47; Bipolar Depression = 11; Mania = 15; Mixed States = 5