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Table 2 Prevalence of high serum gamma-glutamyltransferase levels across general 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 (%)
Total 1,470 (80.0) 339 (20.0)  
Age (years)    
 20-39 974 (83.4) 176 (16.6) <0.001
 40-49 496 (73.6) 163 (26.4)  
BMI (kg/m2)    
 Underweight (<18.5) 158 (88.8) 24 (11.2) <0.001
 Normal (18.5–22.9) 1,113 (84.5) 194 (15.5)  
 Overweight (≥23.0) 197 (57.5) 120 (42.5)  
Alcohol consumption (glasses/week)    
 ≤2.5 1,029 (83.2) 188 (16.8) <0.001
 >2.5 441 (73.6) 151 (26.4)  
Smoking status    
 Non-smoker 1,271 (82.1) 261 (17.9) <0.001
 Ex-smoker 112 (81.6) 24 (18.4)  
 Current smoker 87 (59.6) 54 (40.4)  
Sleep duration (hours/day)    
 ≤5 114 (74.3) 37 (25.7) 0.249
 6–8 1,251 (80.6) 276 (19.4)  
 ≥9 105 (79.5) 26 (20.5)  
Regular walking    
 Yes 553 (83.2) 105 (16.8) 0.030
 No 916 (78.0) 234 (22.0)  
Coffee intake (cups/day)    
 <1 405 (79.3) 99 (20.7) 0.471
 ≥1 687 (81.3) 153 (18.7)  
  1. *Gamma-glutamyltransferase.
  2. Serum GGT ≥21 IU/L.
  3. Estimated percentage.
  4. §χ2 test.