Table 1.

General characteristics of the study population at the time of enrollment in the Korean Multi-center Cancer Cohort study according to sleep duration (n=13 164)

HDL, high-density lipoprotein; LDL, low-density lipoprotein; SBP, systolic blood pressure; DBP, diastolic blood pressure.

¹Significance tests for the categories of sleep time based on t-test and ANOVA test for continuous characteristics.

²Significance tests for the categories of sleep time based on the chi-square test for contingency table analysis of categorical characteristics.

³Person who ever been educated for ≥12 years.

⁴Including tuberculosis, chronic bronchitis, pneumonia, asthma and chronic obstructive pulmonary disease.

⁵Person who ever diagnosed of hypertension or systolic blood pressure≥130, diastolic blood pressure≥85 (mmHg).

⁶Person who ever diagnosed of diabetes mellitus or fasting plasma glucose level ≥100 (mg/dL).

⁷Person whose waist circumference >102 in men, or >88 in women (cm).

⁸Person whose level of fasting plasma HDL level <40 in men, or <50 in women (mg/dL).

⁹Person whose level of fasting plasma triglyceride level ≥150 (mg/dL).

¹⁰Person whose level of fasting plasma total cholesterol level ≥200 (mg/dL).

¹¹Person whose level of fasting plasma LDL level ≥100 (mg/dL).