Table 1 Sample characteristics at baseline

From: Preexisting mild sleep disturbance as a vulnerability factor for inflammation-induced depressed mood: a human experimental study

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

  1. Abbreviation: PSQI, Pittsburgh Sleep Quality Index.
  2. aP-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.
  3. bDepressive symptoms assessed using the Beck Depression Inventory total score without the sleep item.