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Table 2 Prevalence of each criteria for metabolic syndrome of subjects according to weekly working hours (N (%))

From: The association between long working hours and the metabolic syndrome: evidences from the 5th Korean National Health and Nutrition Examination Survey of 2010 and 2012

Criteria Male (n = 2475) Female (n = 1981)
Mean (SD) Working hours per week P** p-trend†† Mean (SD) Working hours per week p** p-trend††
30-39 (n = 239) 40-48 (n = 1180) 49-59 (n = 614) ≥60 (n = 442) 30-39 (n = 423) 40-48 (n = 1025) 49-59 (n = 337) ≥60 (n = 196)
CO* WC 84.0 (8.9) BMI 24.2 (3.2) 52 (21.8) 298 (25.3) 136 (22.1) 99 (22.4) 0.347 0.410 WC 75.8 (9.4) BMI 22.8 (3.4) 141 (33.3) 294 (28.7) 98 (29.1) 67 (34.2) 0.191 0.925
TG 154.7 (117.6) 88 (36.8) 470 (39.8) 211 (34.4) 150 (33.9) 0.054 0.039 98.6 (68.4) 72 (17.0) 142 (13.9) 46 (13.7) 20 (10.3) 0.144 0.033
HDL 46.3 (10.4) 70 (29.3) 392 (33.2) 203 (33.1) 140 (31.7) 0.653 0.866 53.4 (11.1) 175 (41.4) 437 (42.7) 147 (43.6) 81 (41.3) 0.916 0.827
BP§ SBP 119.3 (14.6) 115 (48.1) 469 (39.7) 243 (39.6) 154 (34.8) 0.010 0.004 SBP 112.7 (15.8) 102 (24.1) 190 (18.5) 73 (21.7) 54 (27.6) 0.010 0.366
DBP 80.2 (10.6) DBP 73.3 (9.4)
FPG 97.7 (20.8) 84 (35.1) 362 (30.7) 165 (26.9) 108 (24.4) 0.008 0.001 92.2 (16.7) 78 (18.4) 147 (14.4) 42 (12.5) 32 (16.4) 0.105 0.198
MS   34 (14.2) 224 (19.0) 91 (14.8) 381 (13.8) 0.021 0.074   75 (17.7) 143 (14.0) 50 (14.8) 33 (16.8) 0.286 0.692
  1. SD, standard deviation; p, p-value; CO, central obesity; WC, waist circumference (cm); BMI, body mass index (kg/m2); TG, triglyceride (mg/dL); HDL, high density lipoprotein (mg/dL); BP, blood pressure (mmHg); SBP, systolic blood pressure (mmHg), DBP, diastolic blood pressure (mmHg); FPG, fasting plasma glucose (mg/dL); MS, metabolic syndrome.
  2. *central obesity (WC ≥90 cm or BMI >30 kg/m2 in male, WC ≥80 cm or BMI >30 kg/m2 in female), raised TG ≥150 mg/dL or being treated, reduced HDL (≤40 mg/dL in male, ≤50 mg/dL in female or being treated), §raised BP (SBP ≥130 mmHg or DBP ≥85 mmHg or being treated), raised FPG ≥100 mg/dL or previous diagnosed type 2 diabetes, person with the metabolic syndrome must have central obesity plus any two of the four factors (FPG ≥100 mg/dL or previously diagnosed type 2 diabetes, TG ≥150 mg or being treated, reduced HDL (<40 mg/dL in male, <50 mg/dL in female) or being treated, and raised BP (SBP ≥130 mmHg or DBP ≥85 mmHg) or being treated.
  3. **calculated by chi-square test, ††calculated by chi-square test for trend.
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