Table 1 Differences of characteristics in study population based on QTc grouping (N = 11,209)
From: Prevalence and risk factors of prolonged corrected QT interval in general Chinese population
Variables | QTc ≤ 440 ms (n = 7666) | QTc > 440 ms (n = 3543) | P-value |
|---|---|---|---|
Age (year) | 53 ± 10 | 56 ± 11 | < 0.001* |
Male gender | 4063 (53.0) | 1043 (29.4) | < 0.001* |
Race of Han | 7250 (94.6) | 3380 (95.4) | 0.066 |
Current smoking status | 2915 (38.0) | 1028 (29.0) | < 0.001* |
Current drinking status | 1981 (25.8) | 520 (14.7) | < 0.001* |
Education | < 0.001* | ||
 Primary school or below | 3603 (47.0) | 1987 (56.1) |  |
 Middle school | 3326 (43.4) | 1254 (35.4) |  |
 High school or above | 737 (9.6) | 302 (8.5) |  |
Physical activity | < 0.001* | ||
 Low | 2013 (26.3) | 1278 (36.1) |  |
 Moderate | 5210 (68.0) | 2076 (58.6) |  |
 High | 443 (5.8) | 189 (5.3) |  |
Family income (CNY/year) | < 0.001* | ||
  ≤ 5000 | 876 (11.4) | 513 (14.5) |  |
 5000–20,000 | 4179 (54.5) | 1952 (55.1) |  |
  > 20,000 | 2611 (34.1) | 1078 (30.4) |  |
SBP (mmHg) | 138.9 ± 22.1 | 148.0 ± 25.2 | < 0.001* |
DBP (mmHg) | 80.9 ± 11.1 | 84.4 ± 12.7 | < 0.001* |
BMI (kg/m2) | 24.6 ± 3.6 | 25.2 ± 3.8 | < 0.001* |
WC (cm) | 81.9 ± 9.7 | 83.6 ± 9.9 | < 0.001* |
TC (mmol/L) | 5.2 ± 1.1 | 5.4 ± 1.2 | < 0.001* |
TG (mmol/L) | 1.6 ± 1.4 | 1.8 ± 1.7 | < 0.001* |
LDL-C (mmol/L) | 2.9 ± 0.8 | 3.0 ± 0.9 | < 0.001* |
HDL-C (mmol/L) | 1.4 ± 0.4 | 1.4 ± 0.4 | 0.014* |
FPG (mmol/L) | 5.8 ± 1.4 | 6.2 ± 2.1 | < 0.001* |
Calcium (mmol/L) | 2.3 ± 0.1 | 2.3 ± 0.1 | < 0.001* |
Potassium (mmol/L) | 4.2 ± 0.3 | 4.1 ± 0.4 | < 0.001* |
Magnesium (mmol/L) | 0.8 ± 0.1 | 0.8 ± 0.1 | 0.119 |
History of heart diseasea | 647 (8.4) | 451 (12.7) | < 0.001* |
Medication usedb | 3806 (49.6) | 2122 (59.9) | < 0.001* |