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Table 2 Bivariate correlations between sleep quality, inflammatory activity, and potential covariates

From: Impaired sleep quality is associated with concurrent elevations in inflammatory markers: are post-menopausal women at greater risk?

  PSQI total Composite inflammation MPO
Age 0.07 0.16 − 0.01
No. of exercise times − 0.03 − 0.19* − 0.02
Smoker 0.18* 0.05 0.15
BMI 0.13 0.39*** 0.12
WC 0.14 0.39*** 0.13
HDL-C − 0.07 − 0.13 − 0.17
Glucose 0.22* 0.16 0.14
Insulin 0.12 0.29*** 0.10
SBPdaytime 0.19* 0.04 − 0.11
DBPdaytime 0.12 − 0.06 − 0.07
SBPnighttime 0.09 0.14 − 0.06
DBPnighttime 0.04 0.07 − 0.07
BDI-II 0.46*** 0.17 0.13
BDI-II (no sleep items) 0.44*** 0.16 0.12
PSQI-total 0.28** 0.11
  1. The composite inflammation score reflects the sum of standardized values for CRP, IL-6, and TNF-α, specifically z(CRP) + z(IL-6) + z(TNF-α)
  2. CRP C-reactive protein, TNF-α tumor necrosis factor-alpha, IL-6 interleukin-6, MPO myeloperoxidase, SBP systolic blood pressure, DBP diastolic blood pressure, HDL high density lipoprotein, BDI-II Beck Depression Inventory-II, PSQI Pittsburgh Sleep Quality Index
  3. *P < 0.05
  4. **P < 0.01
  5. ***P < 0.001