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Table 1 Characteristics of participants by BP status in Zhejiang Province, China

From: Exploratory serum fatty acid patterns associated with blood pressure in community-dwelling middle-aged and elderly Chinese

Variables Total subjects (n = 2447) Hypertensive (n = 748) Normotensive (n = 1699) P a
Demographics, %b
Age,     < 0.01
 Middle-age (≤ 55 y) 49.11 53.59 47.13  
 Elder (> 55 y) 50.89 46.41 52.87  
 Females 52.88 51.87 53.33 0.48
Education levels     < 0.01
 Primary (< 9 years) 66.89 75.61 62.31  
 Secondary (9–12 years) 27.86 21.41 31.25  
 High (>12 years) 5.25 2.98 6.44  
Profession     0.01
 Manual labor 38.66 34.24 40.64  
 non-manual labor 61.34 65.76 59.36  
Lifestyle factors, %b     
Smoking habit     0.01
 Current smokers (≥ 18 pack/year) 24.28 20.94 25.75  
 Former/never 75.72 79.06 74.25  
Drinking habit     0.04
 Current (≥ 25 g/day) 26.86 25.13 28.62  
 Former/never 73.14 74.87 71.38  
Salt consumption     0.01
 High-salt (> 6 g/day) 25.72 29.21 24.18  
 Moderate/low-salt 74.28 70.79 76.82  
Exercise habit     < 0.01
 Regular (≥ 3 times/week) 23.85 20.76 28.95  
 Irregular/never 76.15 79.24 71.05  
Family history of hypertension, %b
 Yes 24.43 34.46 20.99 < 0.01
 No 75.57 65.54 79.01  
Anthropometry indicators, mean (SD)c
 BMI (kg/m2) 23.80 (3.23) 24.93 (3.43) 23.44 (3.18) < 0.01
 SBP (mm Hg) 126.42 (17.95) 137.10 (12.76) 119.44 (14.78) < 0.01
 DBP (mm Hg) 81.22 (7.53) 86.28 (8.66) 79.70 (6.10) < 0.01
 HR (beat/min) 71.00 (10.19) 72.88 (11.07) 70.53 (9.75) < 0.01
Biochemical parameters, median (QR)d
 TG(mmol/L) 1.26 (0.88–1.86) 1.47 (1.01–2.08) 1.19 (0.83–1.73) < 0.01
 TC (mmol/L) 4.59 (4.07–5.24) 4.73 (4.19–5.35) 4.54 (4.02–5.85) < 0.01
 Fbg (mmol/L) 4.64 (4.29–5.08) 4.73 (4.36–5.22) 4.60 (4.24–5.00) < 0.01
  1. SD standard deviation, BMI body mass index, SBP systolic blood pressure, DBP diastolic blood pressure, HR heart rate, QR quartile range, TG triglyceride, TC total cholesterol, Fbg fasting blood-glucose
  2. a P value for significance between hypertensive and normotensive group with Student’s unpaired ttest and chi-square test, respectively
  3. bCategorical data are presented as a percentage (%)
  4. cContinuous data with a normal distribution are presented as mean (standard deviation)
  5. dThe skewed data were expressed as the median (quartile range), and were log-transformed before statistic analyses