TABLE 1.
Sociodemographic and screening outcomes of the current sample (N = 36).
|
Group |
|||||
| HFR | LFR | ||||
| Variable | (n = 19) | (n = 17) | t/χ2/U | p | ESE |
| Age (years) | 21.37 (1.64) | 24.18 (5.68) | 104.00 | 0.07 | 0.30 |
| Sex | 0.423 | 0.516 | 0.11 | ||
| Male | 8 | 9 | |||
| Female | 11 | 8 | |||
| HLOE (years) | 12.63 (1.38) | 13.35 (1.94) | 134.50 | 0.40 | 0.14 |
| Shipley 2 IQ Score | 107.53 (13.16) | 104.3 (12.5) | 0.75 | 0.46 | 0.25 |
| BDI-II | 4.32 (2.57) | 4.12 (3.73) | 0.19 | 0.85 | 0.10 |
| PSQI | 3.47 (1.31) | 3.59 (1.12) | –0.28 | 0.78 | −0.12 |
| MAST | 0.63 (0.68) | 0.82 (1.24) | –0.59 | 0.56 | −0.19 |
| Dream Recall Frequency | 4.68 (1.19) | 0.24 (0.03) | 0.000 | <0.001∗∗∗ | 0.85 |
| Recall Upon Awakeninga | 7.59 | 0.006∗∗ | 0.36 | ||
| Yes | 19 | 8 | |||
| No | 11 | 21 | |||
For all variables except Sex and Recall Upon Awakening means are presented with standard deviations in parentheses. Chi-square statistic was computed for Sex and Recall Upon Awakening, and Mann–Whitney U for Age, HLOE, and Dream Recall Frequency. HFR, High Frequency Recall Individuals, LFR, Low Frequency Recall Individuals, ESE, effect size estimate (for t, Cohen’s d; for χ2, Cramer’s V; for U, r); HLOE, Highest Level of Education Completed in Years; BDI-II, Beck Depression Inventory-2nd Edition, PSQI, Pittsburgh Sleep Quality Index, MAST, Michigan Alcoholism Screening Test. Dream Recall Frequency relates to self-report of number of dream traces recalled per week; Recall Upon Awakening refers to whether a dream trace was recalled upon awakening in the sleep laboratory; athere were 13 out of 72 missing dream reports (following the adaptation night); ∗∗p < 0.01; ∗∗∗p < 0.001.