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Table 3 Baseline and metabolic characteristics of all study subjects classified by sleep duration

From: The relationship between hypertension and sleep duration: an analysis of the fifth Korea National Health and Nutrition Examination Survey (KNHANES V-3)

Variables

Sleep duration (hours)

≤5 (n = 793)

6 (n = 1,284)

7 (n = 1,372)

8 (n = 1,164)

≥9 (n = 362)

P value

Male sex (%)

240 (39.1)

535 (52.8)

567 (52.3)

470 (49.1)

137 (41.8)

<0.001

Mean age (yr)

53.0 ± 0.9

44.5 ± 0.6

44.0 ± 0.5

42.9 ± 0.6

43.3 ± 1.3

<0.001

CVD* (%)

73 (6.2)

60 (3.2)

51 (2.5)

63 (3.4)

17 (3.0)

0.004

SBP (mmHg)

121.3 ± 0.9

117.8 ± 0.6

116.8 ± 0.6

116.5 ± 0.6

116.0 ± 1.0

<0.001

DBP (mmHg)

76.3 ± 0.6

76.3 ± 0.5

76.1 ± 0.4

75.3 ± 0.5

72.9 ± 0.9

0.005

Total cholesterol (mg/dL)

190.2 ± 1.7

187.9 ± 1.4

190.2 ± 1.4

186.1 ± 1.3

187.3 ± 3. 3

0.126

Triglyceride (mg/dL)

133.3 ± 5.1

129.5 ± 3.3

135.0 ± 4.4

129.4 ± 4.8

135.0 ± 7.0

0.748

FPG (mg/dL)

99.3 ± 0.9

96.3 ± 0.7

97.4 ± 0.8

96.3 ± 0.8

95.3 ± 1.2

0.018

Obesity (%)

277 (34.2)

428 (33.3)

422 (32.5)

333 (29.5)

104 (28.9)

0.303

Current smoking (%)

80 (16.1)

202 (22.8)

233 (23.1)

174 (19.1)

52 (20.7)

0.081

Physical activity (%)

112 (16.2)

214 (17.5)

239 (20.4)

168 (15.1)

51 (17.3)

0.120

  1. Values are presented as means ± SD or frequencies (%). P-value for sleep duration category.
  2. *CVD included myocardial infarction, angina, and stroke.
  3. Physical activity, moderate exercise at least three times a week.
  4. CVD, cardiovascular disease; SBP, systolic blood pressure; DBP, diastolic blood pressure; FPG, fasting plasma glucose; DM, diabetes mellitus; CKD, chronic kidney disease.