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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