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Table 1 Characteristics of the 34,965 participants in this study

From: Prevalences and associated factors of electrocardiographic abnormalities in Chinese adults: a cross-sectional study

Characteristics Men
(n = 13,983)
Women
(n = 20,982)
P values#
Age, y [mean (95% CI)] 44.8 (44.7–44.9) 44.8 (44.7–44.8) 0.765
Age classes 0.886
 20–29 years old, % 17.2 17.7 0.396
 30–39 years old, % 23.8 24.0 0.738
 40–49 years old, % 22.5 22.3 0.777
 50–59 years old, % 18.6 17.9 0.245
 60–69 years old, % 10.5 9.8 0.123
  ≥ 70 years old, % 7.5 8.3 0.310
BMI, kg/m2 [mean (95% CI)] 24.1 (24.0–24.2) 23.5 (23.4–23.5) < 0.001
Overweight, % 34.9 29.4 < 0.001
Obesity, % 14.0 10.8 < 0.001
Smoking, % 58.2 3.6 < 0.001
Hypertension, % 31.5 25.3 < 0.001
Prediabetes, % 16.2 15.4 0.244
Diabetes, % 10.9 8.9 < 0.001
FPG, mmol/L [mean (95% CI)] 5.4 (5.3–5.4) 5.3 (5.2–5.3) 0.073
PG2h, mmol/L [mean (95% CI)] 6.9 (6.8–7.0) 7.0 (6.9–7.1) 0.328
Hypercholesterolemia, % 11.1 10.5 0.244
Rural area, % 47.7 47.6 0.955
Urban area, % 52.3 52.4 0.955
With cardiovascular/cerebrovascular diseases, % 3.1 2.5 0.121
CVD risk groups    < 0.001
 Without CVD risk factors, % 22.2 60.2 < 0.001
 With one CVD risk factor, % 43.9 25.1 < 0.001
 With two CVD risk factors, % 22.5 10.8 < 0.001
 With three or more CVD risk factors, % 11.3 4.0 < 0.001
  1. The percentages shown above were compared by Chi-square test. # The underlined numbers indicated the significant differences (p < 0.05). The quantitative values of age, BMI, FPG and PG2h were indicated as mean (95% CI) and compared by two-tailed t test. CVD risk factors include hypertension, diabetes, obesity, hypercholesterolemia and smoking history. Older age was not included in the CVD risk factors for analysis because age was mentioned and analyzed separately. BMI body mass index, FPG fasting plasma glucose level, PG2h plasma glucose level of 2 h after oral glucose tolerance test, CVD cardiovascular disease, CI confidence interval