Table 1.
General Characteristics of the Study Population and Conventional ECG Parameters for Cardiac Organ Damage
| Parameters | Overall (N=50) | Normotensive (n=18) | Hypertensive (n=32) | P Value |
|---|---|---|---|---|
| Clinical characteristics | ||||
| Age, y | 42.8±9.1 | 41.2±9.6 | 43.8±8.8 | .458 |
| Height, cm | 172.0±9.1 | 171.9±9.8 | 172.1±8.9 | .934 |
| Weight, kg | 78.0±16.6 | 73.8±21.0 | 80.3±13.3 | .072 |
| BMI, kg/m2 | 26.1±4.0 | 24.7±5.3 | 27.0±2.6 | .043 |
| TC, mg/dL | 220.3±56.8 | 224.5±53.9 | 220.3±56.8 | .562 |
| HDL‐C, mg/dL | 50.0±13.0 | 51.6±13.5 | 50.0±13.0 | .618 |
| LDL‐C, mg/dL | 138.6±28.5 | 136.9±28.4 | 138.6±28.5 | .745 |
| TG, mg/dL | 122.9±69.9 | 121.7±70.1 | 122.9±69.9 | .663 |
| Fasting glucose, mg/dL | 88.1±6.8 | 89.0±6.3 | 88.1±6.8 | .379 |
| BUN, mg/dL | 31.8±10.7 | 31.3±10.5 | 31.8±10.7 | .187 |
| Serum creatinine, mg/dL | 0.90±0.16 | 0.92±0.17 | 0.90±0.16 | .692 |
| BP profile | ||||
| Clinic systolic BP, mm Hg | 144.0±18.5 | 125.1±13.0 | 153.8±12.2 | <.001 |
| Clinic diastolic BP, mm Hg | 95.2±14.8 | 84.1±10.3 | 101.0±13.6 | <.001 |
| Heart rate, beats per min | 80.3±14.1 | 78.2±15.4 | 81.3±13.7 | .511 |
| 24‐h systolic BP, mm Hg | 133.7±14.7 | 120.0±14.9 | 140.8±8.4 | <.001 |
| 24‐h diastolic BP, mm Hg | 84.2±9.7 | 74.4±8.6 | 89.2±5.5 | <.001 |
| 24‐h heart rate, beats per min | 74.9±8.0 | 73.9±8.8 | 75.4±7.7 | .568 |
| Daytime systolic BP, mm Hg | 138.0±15.3 | 122.4±13.1 | 146.1±8.8 | <.001 |
| Daytime diastolic BP, mm Hg | 88.7±10.8 | 77.9±8.8 | 94.3±6.8 | <.001 |
| Daytime heart rate, beats per min | 78.0±8.4 | 76.1±8.2 | 78.9±8.5 | .306 |
| Nighttime systolic BP, mm Hg | 122.4±15.1 | 110.5±14.4 | 128.6±11.5 | <.001 |
| Nighttime diastolic BP, mm Hg | 74.0±9.5 | 66.4±8.8 | 77.9±7.3 | <.001 |
| Nighttime heart rate, beats per min | 67.3±9.2 | 67.0±9.0 | 67.4±9.5 | .890 |
| Conventional ECG parameters | ||||
| PR interval, ms | 152.6±20.1 | 149.1±20.6 | 154.4±19.9 | .389 |
| QRS duration, ms | 99.4±18.5 | 97.5±18.2 | 100.4±18.8 | .606 |
| QT interval, ms | 373.3±32.1 | 375.0±32.0 | 372.4±32.6 | .791 |
| QTc interval, ms | 397.7±24.7 | 396.9±21.9 | 398.2±26.4 | .866 |
| Sokolow‐Lyon index, mV | 24.8±6.9 | 26.6±7.6 | 23.8±6.3 | .178 |
| Cornell voltage index, mV | 15.3±6.4 | 13.9±5.6 | 16.1±6.7 | .248 |
| Cornell product index, mV × ms | 1553.6±755.9 | 1365.1±630.9 | 1657.0±807.3 | .204 |
| Positive Sokolow‐Lyon index, No. | 4 (8.3) | 3 (17.6) | 1 (3.2) | .084 |
| Positive Cornell voltage index, No. | 11 (22.9) | 4 (23.5) | 7 (22.6) | .940 |
| Positive Cornell product index, No. | 6 (12.5) | 1 (5.9) | 5 (16.1) | .305 |
Abbreviations: BMI, body mass index; BP, blood pressure; BUN, blood urea nitrogen; ECG, electrocardiographic; HDL‐C, high‐density lipoprotein cholesterol; TC, total cholesterol; LDL‐C, low‐density lipoprotein cholesterol; TG, triglycerides.