Table 2.
Mean PSG parameters for children with and without DMDD symptoms and Spearman correlations between DMDD and PSG parameters.
| Children without DMDD n = 604 | Children with DMDD n = 61 | Correlation with DMDD scores | ||||
|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | t | r | |
| Sleep latency, minutes | 28.7 | 24.0 | 27.8 | 21.8 | 0.3 | −0.02 |
| Awakenings, # | 0.7 | 1.1 | 0.7 | 1.1 | 0.1 | −0.08 |
| Total sleep time, minutes | 454.1 | 47.9 | 464.2 | 46.8 | 1.6 | 0.08 |
| Sleep efficiency, % | 86.1 | 8.2 | 87.3 | 8.2 | 1.1 | 0.07 |
| Stage 1, % | 3.4 | 3.1 | 3.4 | 2.9 | 0.1 | −0.06 |
| Stage 2, % | 46.1 | 11.4 | 48.9 | 9.7 | 1.9 | 0.13 |
| Stage 3, % | 30.4 | 11.0 | 27.3 | 8.6 | 2.1 | −0.13 |
| Stage REM, % | 20.1 | 5.6 | 20.3 | 6.1 | 0.2 | −0.01 |
| REM latency, minutes | 156.4 | 66.9 | 161.5 | 56.5 | 0.6 | 0.05 |
| Arousal index, # | 3.4 | 2.5 | 3.8 | 2.6 | 1.3 | 0.06 |
| Snoring, frequency | 0.3 | 0.6 | 0.3 | 0.5 | 0.9 | −0.03 |
| Snoring, severity | 0.3 | 0.6 | 0.3 | 0.5 | 1.1 | −0.03 |
| AHI, events/hour | 0.7 | 1.1 | 0.6 | 0.7 | 0.8 | 0.04 |
| SpO2, % | 94.2 | 2.2 | 94.6 | 2.1 | 1.1 | −0.04 |
Note: All t-tests are nonsignificant at 0.05, and all correlations are nonsignificant at 0.01. DMDD = Disruptive Mood Dysregulation Disorder.