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Table 1 General characteristics of the study population according to gender

From: Relationship between nocturnal blood pressure and 24-h urinary sodium excretion in a rural population in Korea

Variable Male (n = 63) Female (n = 85) pvalue
Age (year) 48.3 ± 8.5 47.4 ± 8.2 0.53
  30–39 10 14 0.71
  40–49 20 32  
  50–59 33 39  
Casual SBP (mmHg) 127.9 ± 14.5 119.0 ± 16.4 0.0008
Casual DBP (mmHg) 77.2 ± 11.8 71.3 ± 11.3 0.0002
Pulse rate (beats per minutes) 68.2 ± 11.5 67.2 ± 10.2 0.59
Hypertension (%) 25 (39.6) 24 (28.2) 0.143
Waist circumference (cm) 88.2 ± 7.0 86.4 ± 7.9 0.141
Body mass index (kg/m2) 25.6 ± 3.2 24.7 ± 3.2 0.103
Fasting blood glucose (mg/dL) 98.1 ± 16.4 89.8 ± 13.9 0.0012
Diabetes mellitus (%) 6 (9.5) 4 (4.7) 0.24
Current smoking (%) 22 (34.9) 1 (1.2) <0.0001
Total cholesterol (mg/dL) 183.2 ± 40.0 189.3 ± 34.0 0.29
Triglyceride (mg/dL) 158.9 ± 96.7 119.4 ± 71.9 0.0044
High density lipoprotein (mg/dL) 47.5 ± 10.3 56.4 ± 12.9 <0.0001
Creatinine (mg/dL) 1.1 ± 0.1 0.9 ± 0.1 <0.0001
MetS (%) 17 (26.9) 19 (22.3) 0.51
MetS score 1.49 1.25 0.23
  0 15 27 0.62
  1 20 27  
  2 14 15  
  3 10 14  
  4 4 2  
24-h urine sample    
  Sodium (g/day) 4.9 ± 2.4 3.8 ± 2.4 0.0075
  Potassium (g/day) 2.6 ± 0.9 2.4 ± 1.3 0.275
  Sodium/potassium 3.3 ± 1.3 2.8 ± 1.1 0.0051
Ambulatory blood pressure monitoring    
  SBP, daytime (mmHg) 131.7 ± 10.8 130.8 ± 15.1 0.681
  SBP, nighttime (mmHg) 113.9 ± 15.0 107.9 ± 17.0 0.0291
  SBP, 24 h (mmHg) 124.9 ± 11.4 121.2 ± 14.3 0.0938
  DBP, daytime (mmHg) 83.0 ± 7.5 81.6 ± 9.5 0.3389
  DBP, nighttime (mmHg) 72.7 ± 10.2 66.5 ± 10.1 0.0004
  DBP, 24 h (mmHg) 78.9 ± 7.5 75.1 ± 8.5 0.0056
  Nocturnal dipping (%) 13.6 ± 7.9 17.3 ± 9.3 0.011
  Dipper (%) 46 (73) 69 (81) 0.22
  1. Values are presented as mean ± standard deviation or number (%).
  2. SBP systolic blood pressure, DBP diastolic blood pressure, MetS score the summed number of abnormal criteria for metabolic syndrome except for blood pressure.