Table 2.

Bivariate Correlations

Variable	1	2	3	4	5	6	7
1. Age	1
2. BMI	.19** [.10, .29]
3. PHQ9 Total	−.10 [−.19, .00]	.20** [.10, .29]
4. SCI Total	.01 [−.09, .11]	−.21** [−.30, −.11]	−.62** [−.68, −.55]
5. IL-6 (pg/mL)	.06 [−.04, .16]	.35** [.26, .44]	.10* [.01, .20]	−.15** [−.25, −.05]
6. CRP (ng/mL)	.04 [−.06, .14]	.48** [.40, .56]	.13** [.04, .23]	−.13* [−.22, −.03]	.40** [.31, .48]
7. IL-1β (pg/mL)	.07 [−.03, .17]	.06 [−.04, .16]	−.03 [−.12, .07]	.01 [−.09, .11]	.25** [.15, .34]	.09 [−.01, .19]
8. TNF-α (pg/mL)	.13* [.03, .23]	.19** [.09, .28]	.07 [−.03, .17]	−.05 [−.15, .05]	.19** [.10, .29]	.11* [.01, .21]	.01 [−.09, .11]

Note. All biomarkers represent raw (non-transformed) values. M and SD are used to represent mean and standard deviation, respectively. Values in square brackets indicate the 95% confidence interval for each correlation. The confidence interval is a plausible range of population correlations that could have caused the sample correlation (Cumming, 2014).

^*indicates p < .05.

^**indicates p < .01. SCI = Sleep Condition Indicator (higher scores indicate better sleep). PHQ-9 = Patient Health Questionnaire-9. IL-6 = interluekin-6. CRP = C-reactive protein. TNF-α = tumor-necrosis factor alpha. IL-1β = interleukin-1 beta. BMI = body mass index.