Table 2. Correlation between smoothness index of QTc (SI-QTc) and QTc dispersion and metabolic parameters.
| Variable | SI-QTc | QTc dispersion | ||
|---|---|---|---|---|
| Correlationcoefficients | P-value | Correlation coefficients | P-value | |
| Age | 0.0005 | 0.95 | -0.07 | 0.19 |
| Smoking status* | 0.02 | 0.73 | 0.14 | 0.03 |
| Alcohol use** | 0.03 | 0.62 | 0.07 | 0.28 |
| Weight (kg) | 0.071 | 0.24 | 0.15 | 0.01 |
| Body mass index (kg/m2) | 0.085 | 0.16 | 0.11 | 0.07 |
| Waist circumference (cm) | 0.079 | 0.19 | 0.11 | 0.07 |
| Systolic blood pressure (mmHg) | 0.032 | 0.59 | 0.040 | 0.50 |
| Diastolic blood pressure (mmHg) | 0.069 | 0.25 | 0.060 | 0.32 |
| Fasting glucose (mg/dL) | -0.025 | 0.68 | 0.055 | 0.36 |
| Post-prandial glucose (mg/dL) | -0.024 | 0.69 | 0.036 | 0.55 |
| HbA1c (%) | 0.055 | 0.36 | 0.12 | 0.04 |
| Total cholesterol (mg/dL) | 0.023 | 0.69 | 0.094 | 0.12 |
| Triglycerides (mg/dL) | 0.054 | 0.36 | 0.088 | 0.14 |
| HDL-C (mg/dL) | -0.041 | 0.49 | -0.026 | 0.66 |
| LDL-C (mg/dL) | -0.039 | 0.52 | 0.004 | 0.94 |
| eGFR (ml/min/1.73 m2) | -0.005 | 0.92 | 0.07 | 0.24 |
*Smoking status was classified as “never smokers”, “ex-smokers”, “current smokers with less than 10 cigarettes daily”, and “current smokers with more than 10 cigarettes daily” and are coded as ordinal variables.
**Alcohol use was classified as “less than 2–3 times annually”, “2–3 times monthly” “2–3times weekly”, and “more than 3 times weekly” using questionnaires and are coded as ordinal variables.
HbA1c, hemoglobin A1c; HDL-C, high-density lipoprotein-cholesterol; LDL-C, low-density lipoprotein-cholesterol; eGFR, estimated glomerular filtration rate