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Table 1 General and occupational characteristics of subjects associated with the weekly working hours

From: The association between long working hours and work-related musculoskeletal symptoms of Korean wage workers: data from the fourth Korean working conditions survey (a cross-sectional study)

Characteristics Total(N,%) Weekly working hours p-value*
≤40 41-52 > 52
Total 24,783(100) 13,269(53.5) 6956(28.1) 4558(18.4)  
Gender
 Female 11,890(48.0) 6934(58.3) 3182(26.8) 1774(14.9) < 0.001
 Male 12,893(52.0) 6335(49.1) 3774(29.3) 2784(21.6)  
Age (years)
 20–29 3481(14.0) 1841(52.9) 990(28.4) 650(18.7) < 0.001
 30–39 6469(26.1) 3446(53.3) 1977(30.6) 1046(16.2)  
 40–49 7280(29.4) 3959(54.4) 2103(28.9) 1218(16.7)  
 50–59 4995(20.2) 2577(51.6) 1386(27.7) 1032(20.7)  
  ≥ 60 2558(10.3) 1446(56.5) 500(19.5) 612(23.9)  
Education
 Middle school graduate or below 2659(10.7) 1503(56.5) 552(20.8) 604(22.7) < 0.001
 High school graduate 9536(38.5) 4354(45.7) 2727(28.6) 2455(25.7)  
 College graduate or above 12,588(50.8) 7412(58.9) 3677(29.2) 1499(11.9)  
Monthly income (KRW)
  < 1,300,000 5478(22.1) 3860(70.5) 984(18.0) 634(11.6) < 0.001
 1,300,000-1,999,000 6548(26.4) 2747(42.0) 2079(31.8) 1722(26.3)  
 2,000,000-2,999,000 6964(28.1) 3308(47.5) 2282(32.8) 1374(19.7)  
  ≥ 3,000,000 5793(23.4) 3354(57.9) 1611(27.8) 828(14.3)  
Occupation
 Managers or Professionals 2594(10.5) 1731(66.7) 665(25.6) 198(7.6) < 0.001
 Office workers 6644(26.8) 4385(66.0) 1858(28.0) 401(6.0)  
 Technicians 5438(21.9) 2279(41.9) 1890(34.8) 1269(23.3)  
 Service or Sales workers 6525(26.3) 2877(44.1) 1808(27.7) 1840(23.7)  
 Manual workers 3582(14.5) 1997(55.8) 735(20.5) 850(23.7)  
Employment status
 Regular 18,754(75.7) 9606(51.2) 5729(30.5) 3419(18.2) < 0.001
 Temporary or Day labor 6029(24.3) 3663(60.8) 1227(20.4) 1139(18.9)  
Shift work
 No 22,250(89.8) 12,206(54.9) 6242(28.1) 3802(17.1) < 0.001
 Yes 2533(10.2) 1063(42.0) 714(28.2) 756(29.8)  
Number of employees
  < 50 18,082(73.0) 9220(51.0) 5149(28.5) 3713(20.5) < 0.001
 50–299 4593(18.5) 2734(59.5) 1282(27.9) 577(12.6)  
  ≥ 300 2108(8.5) 1315(62.4) 525(24.9) 268(12.7)  
  1. *calculated by chi-square test