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Table 1 General characteristics of study subjects (n = 901)

From: Relationship between job stress and functional dyspepsia in display manufacturing sector workers: a cross-sectional study

  Male (%) (n = 561) Female (%) (n = 340) p-value
Age (years)
  < 20 24 (4.3%) 53 (15.6%) < 0.001
 21–25 5 (0.9%) 115 (33.8%)  
 26–30 53 (9.4%) 119 (35.0%)  
 31–35 317 (56.5%) 45 (13.2%)  
 36–40 162 (28.9%) 8 (2.4%)  
Body mass index
  < 25 kg/m2 309 (55.1%) 276 (81.2%) < 0.001*
  ≥ 25 kg/m2 252 (44.9%) 64 (18.8%)  
Regular exercise (times / week)
 0 204 (36.4%) 220 (64.7%) < 0.001
 1–2 239 (42.6%) 89 (26.2%)  
  ≥ 3 118 (21.0%) 31 (9.1%)  
Smoking
 Non-smoker 196 (34.9%) 285 (83.8%) < 0.001
 Past smoker 132 (23.5%) 31 (9.1%)  
 Current smoker 233 (41.5%) 24 (7.1%)  
Alcohol consumption (times / week)
 0 107 (19.1%) 126 (37.1%) < 0.001
 1–2 333 (59.4%) 179 (52.6%)  
  ≥ 3 121 (21.6%) 35 (10.3%)  
Duration of shift work (years)
  < 5 44 (7.8%) 79 (23.2%) < 0.001
 5–9 190 (33.9%) 152 (44.7%)  
 10–14 267 (47.6%) 101 (29.7%)  
  ≥ 15 60 (10.7%) 8 (2.4%)  
Weekly working hours (hours / week)
  ≤ 40 83 (14.8%) 36 (10.6%) 0.491§
 41–51 383 (68.3%) 252 (74.1%)  
  ≥ 52 95 (16.9%) 52 (15.3%)  
ISI-K index (score)
 Non-significant insomnia (0–15) 530 (94.5%) 312 (91.8%) 0.111
 Clinically significant insomnia (16–28) 31 (5.5%) 28 (8.2%)  
Functional dyspepsia
 (−) 533 (95.0%) 311 (91.5%) 0.034*
 (+) 28 (5.0%) 29 (8.5%)  
  1. ISI-K Korean version of insomnia severity index
  2. §p-value of linear by linear association
  3. *p < 0.05