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Table 1 Baseline characteristics of study cohort across three QRS groups

From: Systolic blood pressure but not electrocardiogram QRS duration is associated with heart rate variability (HRV): a cross-sectional study in rural Australian non-diabetics

  QRS duration (ms) p-value
80–100 (n = 115) >100–120 (n = 69) >120 (n = 16)  
n % n % n %
Age (years), mean (SD) 65.5 (11.2)   67.4 (10.1)   72.7 (6.8)   0.032
Gender        0.002
 Female 82 71.3 31 44.9 9 56.3  
 Male 33 28.7 38 55.1 7 43.8  
BMI 27 (5.2)   28.4 (4.4)   26.3 (2.3)   0.091
Hypertension 44 38.3 40 58 10 62.5 0.015
Cardiovascular 17 14.8 12 17.4 4 25 0.57
Smoking 2 1.7 1 1.5 0   0.87
Alcohol 5 4.4 5 7.3 1 6.3 0.70
Exercise 6.7 (3.4)   6.5 (3.3)   7.5 (3.3)   0.61
SBP 127.1 (17.7)   131.1 (15.7)   127.2 (16.2)   0.30
DBP 75.4 (8.1)   76.8 (8.2)   76.7 (6.8)   0.50
Total cholesterol 5.3 (1.1)   5.3 (1.0)   5.1 (0.9)   0.87
LDL 3.1 (1.0)   3.2 (0.8)   3.0 (0.9)   0.86
HDL 1.6 (0.5)   1.6 (0.5)   1.5 (0.3)   0.53
Triglycerides 1.2 (0.7)   1.1 (0.5)   1.4 (0.5)   0.38
Creatinine 67 (15.8)   71.6 (19.9)   65.6 (14.5)   0.20
  1. SD standard deviation, BMI body mass index, SBP systolic blood pressure, DBP diastolic blood pressure, LDL low density lipoprotein, HDL high density lipoprotein