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Table 1 Characteristics of male bus drivers

From: Cardiovascular Disease Risk of Bus Drivers in a City of Korea

  Regular   Irregular   Total   p-value*
Age (yr)        
  < 50 107 (31.1) 16 (18.0) 123 (28.4) 0.000
  50-59 232 (67.4) 24 (27.0) 256 (59.1)  
  ≥ 60 5 ( 1.5) 49 (55.0) 54 (12.5)  
Work duration (yr)        
  <20 143 (41.6) 21 (23.6) 164 (37.9) 0.001
  20-29 107 (31.1) 26 (29.2) 133 (30.7)  
  ≥30 94 (27.3) 42 (47.2) 136 (31.4)  
PDAR        
  <0.5 214 (62.2) 41 (46.1) 255 (58.9) 0.004
  ≥0.5 130 (37.8) 48 (53.9) 178 (41.1)  
Shift pattern of duty        
  Double 328 (95.3) 5 ( 5.6) 333 (76.9) 0.000
  Alternate 16 ( 4.7) 84 (94.4) 100 (23.1)  
Total 344 (100.0) 89 (100.0) 433 (100.0)  
  1. *p-value were tested by chi-square test.
  2. PDAR, professional driving duration/age ratio.
  3. Shift pattern, double: work 8 hours every day. Alternate: work more than 12 hours every other day.