Table 3 Distribution of workers with functional dyspepsia by characteristics (n = 901)
|  | Male (n = 561) | Female (n = 340) | ||||
|---|---|---|---|---|---|---|
FD(−) N | FD(+) N | p-value | FD(−) N | FD(+) N | p-value | |
Age (years) | ||||||
  < 20 | 22 (91.7%) | 2 (8.3%) | 0.456 | 48 (90.6%) | 5 (9.4%) | 0.967 |
 21–25 | 5 (100%) | 0 (0%) |  | 106 (92.2%) | 9 (7.8%) |  |
 26–30 | 48 (90.6%) | 5 (9.4%) |  | 108 (90.8%) | 11 (9.2%) |  |
 31–35 | 302 (95.3%) | 15 (4.7%) |  | 42 (93.3%) | 3 (6.7%) |  |
 36–40 | 156 (96.3%) | 6 (3.7%) |  | 7 (87.5%) | 1 (12.5%) |  |
Body mass index | ||||||
  < 25 kg/m2 | 297 (96.1%) | 12 (3.9%) | 0.182 | 252 (91.3%) | 24 (8.7%) | 0.820 |
  ≥ 25 kg/m2 | 236 (93.7%) | 16 (6.3%) |  | 59 (92.2%) | 5 (7.8%) |  |
Regular exercise (times / week) | ||||||
 0 | 194 (95.1%) | 10 (4.9%) | 0.997 | 203 (92.3%) | 17 (7.7%) | 0.617 |
 1–2 | 227 (95.0%) | 12 (5.0%) |  | 81 (91.0%) | 8 (9.0%) |  |
  ≥ 3 | 112 (94.9%) | 6 (5.1%) |  | 27 (87.1%) | 4 (12.9%) |  |
Smoking | ||||||
 Non-smoker | 184 (93.9%) | 12 (6.1%) | 0.662 | 262 (91.9%) | 23 (8.1%) | 0.228 |
 Past smoker | 126 (95.5%) | 6 (4.5%) |  | 26 (86.7%) | 5 (16.1%) |  |
 Current smoker | 223 (95.7%) | 10 (4.3%) |  | 23 (95.8%) | 1 (4.2%) |  |
Alcohol consumption (times / week) | ||||||
 0 | 104 (97.2%) | 3 (2.8%) | 0.506 | 116 (92.1%) | 10 (7.9%) | 0.362 |
 1–2 | 315 (94.6%) | 18 (5.4%) |  | 161 (89.9%) | 18 (10.1%) |  |
  ≥ 3 | 114 (94.2%) | 7 (5.8%) |  | 34 (97.1%) | 1 (2.9%) |  |
Duration of Shift work (years) | ||||||
  < 5 | 42 (95.5%) | 2 (4.5%) | 0.956# | 72 (91.1%) | 7 (8.9%) | 0.863 |
 5–9 | 179 (94.2%) | 11 (5.8%) |  | 141 (92.8%) | 11 (7.2%) |  |
 10–14 | 254 (95.1%) | 13 (4.9%) |  | 91 (90.1%) | 10 (9.9%) |  |
  ≥ 15 | 58 (96.7%) | 2 (3.3%) |  | 7 (87.5%) | 1 (12.5%) |  |
Weekly working hours (hours / week) | ||||||
  ≤ 40 | 81 (97.6%) | 2 (2.4%) | 0.444 | 34 (94.4%) | 2 (5.6%) | 0.148 |
 41–51 | 363 (94.8%) | 20 (5.2%) |  | 233 (92.5%) | 19 (7.5%) |  |
  ≥ 52 | 89 (93.7%) | 6 (6.3%) |  | 44 (84.6%) | 8 (15.4%) |  |
ISI-K index (score) | ||||||
 Non-significant insomnia (0–15) | 509 (96.0%) | 21 (4.0%) | < 0.001* | 289 (92.6%) | 23 (7.4%) | 0.011* |
 Clinically significant insomnia (16–28) | 24 (77.4%) | 7 (22.6%) |  | 22 (78.6%) | 6 (21.4%) |  |