Table 4. Comparison of clinical and paraclinical characteristics according to quartiles of serum 25 hydroxy vitamin D levels.
| Variables | Quartile 1 | Quartile 2 | Quartile 3 | Quartile 4 | P |
| 25(OH)D (0.5-5.71) ng/mL | 25(OH)D (5.72-7.25) ng/mL | 25(OH)D (7.26-9.74) ng/mL | 25(OH)D (>9.74) ng/mL | ||
| Age | 53.6± 9.53 | 53.2± 8.1 | 58.3±11.2 | 59.3±11.2 | 0.02 |
| BMI (kg/m2) | 27.7±4.39 | 28.1± 5.16 | 27.2±4.8 | 26.4±3.4 | 0.66 |
| Systolic blood pressure (mm Hg) | 123.1±22.8 | 123.9±17.9 | 125.5±19.3 | 125.0±15.6 | 0.94 |
| Diastolic blood pressure (mm Hg) | 75.8±13.5 | 77.0±10.6 | 76.3±12.3 | 75.8±5.1 | 0.96 |
| FBS (mg/dL) | 174.3± 72.8 | 171.3± 58.8 | 176.1±62.1 | 179.6±93.7 | 0.97 |
| HbA1C (%) | 8.7± 1.84 | 8.4±2.03 | 8.68±1.66 | 8.7±2.2 | 0.82 |
| Cholesterol (mg/dL) | 170.1±36.8 | 178.4±39.0 | 176.1±45.4 | 182.3±33.9 | 0.57 |
| Triglyceride (mg/dL) | 153.6±103.6 | 190.8±132.6 | 165.0±96.0 | 150.6±69.7 | 0.25 |
| LDL(mg/dL) | 99.0±28.4 | 104.7±25.3 | 102.6±35.9 | 114.0±34.2 | 0.36 |
| HDL (mg/dL) | 42.1± 5.37 | 40.7± 6.2 | 44.1±11.1 | 42.6±3.5 | 0.14 |
| Creatinine (mg/dL) | 0.97±0.25 | 0.93±0.21 | 0.98±0.25 | 0.95±0.17 | 0.72 |
| Urine albumin to creatinine ratio (micg/mg) | 48.6± 76.1 | 43.1±52.1 | 55.0±114.9 | 48./3±55.6 | 0.90 |
| GFR | 84.2±20.7 | 90.1±30.3 | 80.7±28.2 | 72.9±27.9 | 0.15 |
| IGF1 | 104.3±42.8 | 105.9±47.4 | 106.9±44.6 | 116.2±48.1 | 0.85 |
| Insulin | 11.6±7.9 | 10.7±4.0 | 9.5±4.3 | 10.3±4.4 | 0.49 |
| HOMA-IR | 1.9±1.3 | 1.6±0.6 | 1.4±0.6 | 1.5±0.6 | 0.14 |
| HsCRP | 3.3±3.6 | 3.6±3.9 | 2.4±4.1 | 4.4±4.1 | 0.32 |
| Sex (male %) | 37.1% | 31.4% | 22.2% | 9.3% | 0.92 |
| Hypertension (%) | 34.35% | 40.45% | 19.0% | 6.2% | 0.58 |
FBS: Fasting blood glucose; HbA1C: Glycosylated hemoglobin; LDL: Low-density lipoprotein; HDL: High-density lipoprotein; GFR: Glumerolar filtration rate; HsCRP: High sensitive C-reactive protein; HOMA-IR: Homeostasis model assessment of insulin resistance; P<0.05 is considered significant; ANOVA test was used for analysis of normal distribution variable and Kruskal Wallis for non normal distribution variable.