Table 5.

Correlations between stimulated interleukin-8 and psychosocial factors by race and for the full sample.

	African American (n = 32)	White (n = 37)	Total (N = 69)
Pittsburgh Sleep Quality Inventory – Total	0.36*	0.14	0.27*
Subjective quality1	0.30	0.01	0.12
Sleep latency1	0.07	0.13	0.10
Sleep duration1	−0.47**	−0.10	−0.28*
Sleep efficiency1	−0.18	−0.04	−0.12
Sleep disturbance1	0.37*	0.30†	0.35**
Daytime dysfunction1	0.34†	−0.15	0.17
Parenting Stress Index – Total	0.39*	0.07	0.22†
Parental distress	0.39*	0.10	0.22†
Difficult child	0.39*	0.21	0.27*
Parent-child dysfunctional interaction1	0.16	−0.12	0.02
Perceived Stress Scale	0.42*	0.02	0.17
CES-D Scale - Total	0.32†	0.02	0.16
Depressed mood1	0.47**	0.07	0.23†
Somatic symptoms	0.14	0.11	0.12
Absence of positive affect1	0.31†	0.11	0.15

All analyses control for BMI.

Note: Higher Total PSQI scores, subjective quality rating, and sleep latency reflect greater severity of sleep problems.

CES-D: Center for Epidemiologic Studies - Depression Scale

¹Spearman correlation. Pearson correlations were used unless otherwise noted.

^†p ≤ 0.10;

^*p ≤ 0.05;

^**p ≤ 0.01