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Table 3 Prevalence of high serum gamma-glutamyltransferase levels across occupational characteristics

From: Association between long working hours and serum gamma-glutamyltransferase levels in female workers: data from the fifth Korean National Health and Nutrition Examination Survey (2010-2011)

Variable Serum GGT* p-value§
Normal level group High level group
N (%) N (%)
Weekly working hours    
 ≤29 321 (78.0) 79 (22.0) 0.002
 30–51 882 (83.1) 172 (16.9)  
 ≥52 267 (73.4) 88 (26.6)  
Working type    
 Day work 1,200 (79.9) 278 (20.1) 0.820
 Non-day work 261 (80.6) 56 (19.4)  
Occupation    
 Manual work 212 (78.2) 54 (21.8) 0.489
 Non-manual work 1,257 (80.3) 285 (19.7)  
Employment status    
 Salary worker 947 (83.2) 180 (16.8) <0.001
 Self-employed 218 (71.6) 71 (28.4)  
 Unpaid family worker 75 (70.0) 32 (30.0)  
  1. *Gamma-glutamyltransferase.
  2. Serum GGT ≥21 IU/L.
  3. Estimated percentage.
  4. §χ2 test.