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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.