Table 1.
Characteristics of randomized participants by sleep condition.
| 8h TIB (n=19) |
6h TIB (n=49)
|
Total (n=68) |
||||||
|---|---|---|---|---|---|---|---|---|
| Late Bedtime (n=24) |
Early Risetime (n=25) |
|||||||
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | |
| Age (years) | 26.4 | 7.4 | 24.4 | 5.6 | 25.7 | 7.0 | 25.4 | 6.6 |
| Education (years)b | 16.0 | 2.0 | 14.4 | 1.7 | 14.5 | 1.5 | 14.9 | 1.8 |
| MDD Age of Onset (years) | 17.7 | 6.1 | 16.2 | 6.3 | 16.2 | 7.6 | 16.6 | 6.7 |
| Current episode (months) | 10.2 | 7.6 | 14.8 | 22.2 | 9.5 | 8.5 | 11.6 | 14.7 |
| n | % | n | % | n | % | n | % | |
| Sex | ||||||||
| Male | 12 | 63.1 | 11 | 45.8 | 11 | 44.0 | 34 | 50.0 |
| Female | 7 | 36.8 | 13 | 54.2 | 14 | 56.0 | 34 | 50.0 |
| Race | ||||||||
| Black/African American | 3 | 15.8 | 3 | 12.5 | 2 | 8.0 | 8 | 11.8 |
| White | 14 | 73.7 | 18 | 75.0 | 20 | 80.0 | 52 | 76.5 |
| Other | 2 | 10.5 | 3 | 12.5 | 3 | 12.0 | 8 | 11.8 |
| Marital Status | ||||||||
| Unmarried | 15 | 78.9 | 21 | 87.5 | 18 | 72.0 | 54 | 79.4 |
| Married/Partnered | 4 | 21.1 | 2 | 8.3 | 5 | 20.0 | 11 | 16.2 |
| Separated/Divorced | 0 | 0.0 | 1 | 4.2 | 2 | 8.0 | 3 | 4.4 |
| Employment Status | ||||||||
| Full-time employment | 4 | 21.1 | 4 | 16.7 | 3 | 12.0 | 11 | 16.2 |
| Part-time employment | 8 | 42.1 | 9 | 37.5 | 9 | 36.0 | 26 | 38.2 |
| Unemployed | 7 | 36.8 | 11 | 45.8 | 13 | 52.0 | 31 | 45.6 |
| Positive family history of MDD | 13 | 68.4 | 19 | 79.2 | 17 | 68.0 | 49 | 72.1 |
| MDD treatment history | ||||||||
| None | 6 | 31.6 | 8 | 33.3 | 7 | 28.0 | 21 | 30.9 |
| Medication | 5 | 26.3 | 1 | 4.2 | 3 | 12.0 | 9 | 13.2 |
| Psychotherapy | 3 | 15.8 | 2 | 8.3 | 2 | 8.0 | 7 | 10.3 |
| Both | 4 | 21.0 | 12 | 50.0 | 11 | 44.0 | 27 | 39.7 |
| Comorbidity | ||||||||
| Medical | 7 | 36.8 | 8 | 33.3 | 13 | 52.0 | 28 | 41.0 |
| Psychiatrica | 4 | 21.0 | 7 | 29.2 | 6 | 24.0 | 17 | 25.0 |
a
Lifetime bipolar disorder, psychotic disorder, substance or alcohol dependence, eating disorder, post-traumatic stress disorder, and obsessive-compulsive disorder and post 6-month substance or alcohol abuse were exclusionary
b
8h TIB group had significantly more years of education than either the Late Bedtime or Early Risetime group (p < .005)
Abbreviations
MDD = Major depressive disorder
6h TIB = 6 hours time in bed
8h TIB = 8 hours time in bed