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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.