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Table 1 Characteristics of study participants

From: Associations among working hours, sleep duration, self-rated health, and health-related quality of life in Korean men

Variables N Mean (SE) or Proportion (SE)
Age, y 2141 35.7 (0.2)
Household income (quartile), %
 Lowest 488 24.2 (1.2)
 Lower middle 588 25.8 (1.1)
 Upper middle 552 25.5 (1.1)
 Highest 542 24.4 (1.2)
Education level, %
 Middle school or below 80 3.5 (0.5)
 High school 749 37.5 (1.4)
 College or above 1312 59.0 (1.5)
Occupation, %
 White collar/professional 1020 51.2 (1.5)
 Service sales 293 15.5 (1.0)
 Blue collar 643 33.3 (1.5)
Marital status, married, % 1400 59.4 (1.6)
Smoking, % 962 45.2 (1.3)
Alcohol drinking, % 1711 79.9 (1.0)
Hypertension, % 429 19.5 (0.9)
Diabetes mellitus, % 429 4.8 (0.6)
Obesity, % 957 44.2 (1.2)
Working hours, h/w 2141 45.5 (0.4)
Sleep duration, h/d 2141 6.9 (0.0)
Poor SRH, % 230 11.7 (0.8)
HRQOL, score 2141 98.3 (0.1)
Problem in HRQOL components, %
 Mobility 55 2.6 (0.4)
 Self-care 11 0.4 (0.1)
 Usual activity 30 1.4 (0.3)
 Pain/discomfort 233 10.9 (0.7)
 Anxiety/depression 88 4.1 (0.5)
  1. Data are expressed as mean (SE) or proportion (SE). Each component of HRQOL was rated on two level with responses divided into two categories: no problems versus some/extreme problems