Table 1

Characteristics of the study population at baseline, N (%)

Number of indivi(duals (%)p Value
Non-night workers (n=7506)Night workers (n=4816)
Age, years51.7 (4.7)51.2 (4.8)<0.001
Education0.06
  Compulsory3069 (41)2071 (43)
  More than compulsory4434 (59)2744 (57)
  Missing3 (0.04)1 (0.02)
Children0.35
  Have children6122 (82)3960 (82)
  Do not have children1384 (18)856 (18)
  Missing
Tobacco use<0.001
  No919 (12)410 (8)
  Yes6506 (87)4359 (91)
  Missing81 (1)47 (1)
Body mass index<0.001
  Normal weight3570 (48)2099 (42)
  Underweight30 (0.4)10 (0.2)
  Overweight3325 (44)2278 (47)
  Obesity530 (7)500 (10)
  Missing51 (0.7)19 (0.4)
Physical activity0.04
  Moderate1968 (26)1209 (25)
  Low2332 (31)1509 (31)
  High3192 (43)2077 (43)
  Missing14 (0.2)21 (0.4)
Alcohol consumption<0.001
  No alcohol147 (2)116 (2)
  Alcohol3343 (45)1954 (41)
  Missing4016 (53)2746 (57)
Coffee consumption<0.001
  No coffee471 (6)311 (6)
  1–2 cups a day1298 (17)789 (16)
  3–4 cups a day2595 (35)1437 (30)
  5+ cups a day3140 (42)2272 (47)
  Missing2 (0.03)7 (0.2)
Previous cancer0.14
  No7319 (98)4716 (98)
  Yes187 (2)100 (2)
  Missing
New cancer diagnosis during follow-up0.16
  No cancer6870 (92)4419 (92)
  Prostate294 (4)160 (3)
  Other cancer342 (4)237 (5)
Time to prostate cancer diagnosis (years(SD))5.8 (2.7)6.1 (2.7)0.24
  • Significance levels based on t-tests or χ2 tests.