Table 2.
Bivariate correlations between sleep parameters and metabolic variables in all subjects.
| BMI (kg/m2) |
Glucose (mmol/L) |
Insulin (μU/mL) |
SBP (mmHg) |
DBP (mmHg) |
TC (mmol/L) |
TG (mmol/L) |
HDL (mmol/L) |
LDL (mmol/L) |
|
|---|---|---|---|---|---|---|---|---|---|
| Total sleep time, min | 0.093** | 0.075** | 0.022 | 0.042* | 0.040 | 0.003 | 0.031 | 0.006 | −0.016 |
| SWS, % of TST | −0.119** | −0.086** | −0.005 | −0.034 | −0.011 | −0.058** | −0.056** | 0.027 | −0.029 |
| REM, % of TST | −0.099** | −0.075** | −0.053* | 0.034 | 0.058** | −0.036 | −0.064** | 0.014 | 0.008 |
| Sleep efficiency, % | 0.105** | 0.089** | 0.003 | 0.006 | 0.002 | 0.018 | 0.042* | −0.005 | 0.020 |
| MAI | 0.230** | 0.145** | 0.225** | 0.090** | 0.137** | 0.134** | 0.145** | 0.050* | 0.182** |
BMI, body mass index; SBP, systolic blood pressure; DBP, diastolic blood pressure; TC, total cholesterol; TG, triglyceride; HDL-C, high-density lipoprotein cholesterol; LDL-C, low-density lipoprotein cholesterol; SWS, slow-wave sleep; TST, total sleep time; REM, rapid eye movement; MAI, microarousal index.
All numbers represent correlation coefficients.
Spearman correlation analysis:
**
significant at the 0.01 level;
*
significant at the 0.05 level.