Table 1.

Sample characteristics at baseline

Characteristic	Post-endotoxin depressed mood (n = 21)	No post-endotoxin depressed mood (n = 37)	P*
Mean age (SD)	24.3 (7.1)	25.7 (7.3)	0.47
Female (%)	16 (76.2)	21 (56.8)	0.14
White (%)	7 (33.3)	12 (32.4)	0.94
Mean body mass index (SD)	23.1 (2.9)	24.7 (2.6)	0.04
Physical sickness response (%)	19 (90.5)	21 (56.8)	0.008

SD standard deviation

*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