Table 1 Prevalence of elevated ALT stratified by sociodemographic, work- and lifestyle-related factors (n = 15,348)
|  | n (%) | % ALT elevated men: > 45 U/L women: > 34 U/L | Geometric mean U/L (GSD) | Median U/L (IQR) |
|---|---|---|---|---|
Total | 15,348 (100.0) | 18.5 | 28.9 (1.65) | 28 (21–40) |
Sociodemographic factors | ||||
 Age (in years) | ||||
  < 35 | 4030 (26.3) | 17.2 | 27.1 (1.70) | 26 (19–38) |
  35–39 | 1818 (11.9) | 19.8 | 28.9 (1.70) | 28 (20–40) |
  40–44 | 2200 (14.3) | 18.5 | 28.2 (1.68) | 28 (20–40) |
  45–49 | 2742 (17.9) | 19.5 | 30.1 (1.63) | 29 (22–41) |
  50–54 | 2534 (16.5) | 18.9 | 30.6 (1.56) | 30 (23–40) |
  ≥ 55 | 2024 (13.2) | 18.2 | 30.2 (1.57) | 29 (22–39) |
 Gender | ||||
  Male | 12,013 (78.3) | 21.6 | 32.8 (1.56) | 31 (24–43) |
  Female | 3335 (21.7) | 7.2 | 18.5 (1.52) | 18 (14–23) |
Work-related factors | ||||
 Working time system | ||||
  Day work | 10,931 (71.2) | 16.4 | 27.5 (1.66) | 27 (19–38) |
  Shift work | 4417 (28.8) | 23.6 | 32.9 (1.59) | 32 (24–44) |
 Occupational group | ||||
  Manual worker | 5447 (35.5) | 24.0 | 32.8 (1.61) | 32 (24–44) |
  Skilled/supervisory worker | 6453 (42.0) | 16.8 | 27.3 (1.67) | 27 (19–38) |
  Managerial staff | 3448 (22.5) | 13.1 | 26.5 (1.61) | 26 (19–35) |
Lifestyle-related factors | ||||
 Smoking statusa | ||||
  Non-smoker | 8735 (56.9) | 16.6 | 27.6 (1.65) | 27 (20–38) |
  Former smoker | 3552 (23.1) | 23.3 | 32.2 (1.62) | 32 (23–44) |
  Smoker | 3023 (19.7) | 18.6 | 29.5 (1.63) | 29 (21–40) |
 Body-mass-index (kg/m2)a | ||||
  Normal weight (< 25) | 6138 (40.0) | 7.8 | 23.1 (1.57) | 23 (17–30) |
  Overweight (25– < 30) | 6281 (40.9) | 20.1 | 31.5 (1.57) | 31 (23–42) |
  Obesity class I (30– < 35) | 2150 (14.0) | 36.4 | 38.0 (1.62) | 38 (28–53) |
  Obesity class II (35– < 40) | 570 (3.7) | 40.7 | 39.9 (1.71) | 39.5 (28–56) |
  Obesity class III (≥ 40) | 207 (1.4) | 40.1 | 40.5 (1.65) | 37 (30–56) |
 Alcohol consumptiona (drinks per week) | ||||
  < 1 | 4297 (28.0) | 16.5 | 27.1 (1.67) | 26 (19–37) |
  1 | 3911 (25.5) | 18.4 | 28.2 (1.66) | 27 (20–39) |
  2 | 3294 (21.5) | 18.3 | 29.7 (1.61) | 29 (22–40) |
  ≥ 3 | 3256 (21.2) | 21.7 | 31.9 (1.61) | 31 (23–43) |
Diabetes | ||||
 History of diabetes mellitus | ||||
  No | 14,711 (95.9) | 17.8 | 28.6 (1.64) | 28 (21–39) |
  Yes | 637 (4.2) | 35.5 | 37.4 (1.68) | 36 (27–53) |
Time of examination | ||||
 Day of week | ||||
  Monday | 2920 (19.0) | 18.5 | 28.6 (1.65) | 28 (21–40) |
  Tuesday | 3717 (24.2) | 18.5 | 28.7 (1.65) | 28 (20–40) |
  Wednesday | 3170 (20.7) | 18.6 | 29.1 (1.66) | 28 (21–40) |
  Thursday | 3074 (20.0) | 18.9 | 29.5 (1.62) | 29 (21–39) |
  Friday | 2465 (16.1) | 18.0 | 28.8 (1.66) | 28 (20–39) |
  Weekend | 2 (0.0) | – | – | – |
 Season | ||||
  Spring (March–May) | 4175 (27.2) | 20.2 | 29.9 (1.65) | 29 (21–41) |
  Summer (June–August) | 3589 (23.4) | 15.1 | 27.2 (1.63) | 27 (20–37) |
  Fall (September–November) | 3291 (21.4) | 17.2 | 28.4 (1.64) | 28 (20–39) |
  Winter (December–February) | 4293 (28.0) | 20.8 | 30.0 (1.66) | 29 (21–41) |
 Year | ||||
  2013 | 5778 (37.7) | 17.6 | 28.4 (1.65) | 28 (20–39) |
  2014 | 2471 (16.1) | 20.2 | 30.3 (1.63) | 30 (22–41) |
  2015 | 1232 (8.0) | 20.6 | 29.7 (1.61) | 29 (21–40) |
  2016 | 1628 (10.6) | 20.4 | 29.6 (1.68) | 29 (21–40) |
  2017 | 1897 (12.4) | 15.5 | 27.8 (1.63) | 27 (20–38) |
  2018 | 2342 (15.3) | 19.0 | 29.0 (1.67) | 28 (21–39) |