Table 1. Sample characteristics at baseline.
| Characteristic | Females with sleep disturbance (n=31) | Females without sleep disturbance (n=36) | Pa | Males with sleep disturbance (n=19) | Males without sleep disturbance (n=25) | Pa | |
|---|---|---|---|---|---|---|---|
| Assigned to endotoxin (%) | 15 (48.4) | 22 (61.1) | 0.30 | 9 (47.4) | 14 (56.0) | 0.57 | |
| Mean age (s.d.) | 23.5 (6.3) | 23.0 (6.4) | 0.74 | 24.5 (5.9) | 26.1 (7.6) | 0.44 | |
| Mean body mass index (s.d.) | 22.9 (2.9) | 24.1 (2.8) | 0.09 | 24.7 (2.7) | 24.0 (2.3) | 0.39 | |
| Race (%) | |||||||
| Caucasian | 11 (35.5) | 13 (36.1) | 8 (42.1) | 11 (44.0) | |||
| Asian/Pacific Islander | 6 (19.4) | 9 (25.0) | 0.69 | 8 (42.1) | 8 (32.0) | 0.85 | |
| African American | 1 (3.2) | 2 (5.6) | 0 (0.0) | 1 (4.0) | |||
| Latino | 8 (25.8) | 10 (27.8) | 2 (10.5) | 4 (16.0) | |||
| Other | 5 (16.1) | 2 (5.6) | 1 (5.3) | 1 (4.0) | |||
| Mean depression score (s.d.)b | 4.3 (5.0) | 2.0 (3.0) | <0.05 | 2.9 (2.7) | 1.4 (2.1) | <0.05 | |
| Mean PSQI global score (s.d.) | 4.5 (1.5) | 1.1 (0.8) | <0.0001 | 4.0 (1.0) | 1.3 (0.6) | <0.0001 | |
Abbreviation: PSQI, Pittsburgh Sleep Quality Index.
a
P-values from t-tests when the sample characteristic is a continuous variable and from chi-square tests when the sample characteristic is a categorical variable.
b
Depressive symptoms assessed using the Beck Depression Inventory total score without the sleep item.