Table 1.

Baseline characteristics of subcohort participants and those diagnosed with colorectal cancer, breast cancer, and prostate cancer during follow-upa

SubcohortColorectal cancer
WomenMenWomenMenBreast cancerProstate cancer
N1,3321,664284278659833
Median years of follow-up per person14.214.1
25(OH)D (nmol/L), median (IQR)b42.9 (34.8–53.1)54.8 (43.0–68.8)41.0 (33.4–50.8)53.8 (45.0–69.1)44.0 (35.6–52.5)57.2 (45.2–70.8)
Age (years), median (IQR)53.5 (46.7–61.1)53.9 (46.0–62.0)61.9 (54.0–66.4)62.1 (55.1–65.8)55.3 (47.8–62.4)59.9 (53.8–65.2)
Waist circumference (cm), median (IQR)77.0 (70.6–85.7)92.0 (86.0–98.4)79.9 (71.3–89.0)95.0 (89.5–100.5)77.5 (71.0–86.0)93.0 (87.2–99.0)
Country of birth (%)
 Australia/New Zealand/Northern Europe86.381.287.379.191.485.1
 Southern Europe13.718.812.720.98.714.9
Educational attainment (%)
 Primary school or less10.312.212.718.07.112.1
 Some secondary school44.931.744.733.845.130.4
 Secondary school20.926.018.726.622.326.9
 Tertiary qualification24.030.223.921.625.530.6
Socioeconomic status (%)
 1st quintile (most deprived)12.313.913.713.010.413.0
 2nd quintile15.417.714.423.215.214.4
 3rd quintile16.216.720.417.416.515.4
 4th quintile23.622.516.920.324.724.3
 5th quintile (least deprived)32.529.334.526.133.232.9
Alcohol intake (%)
 Lifetime abstainer34.512.831.012.233.113.5
 Former2.85.83.23.24.05.2
 Current low19.426.822.920.918.425.0
 Current medium20.126.918.328.822.227.5
 Current high23.327.724.734.922.328.9
Smoking status (%)
 Never67.043.462.337.868.145.0
 Former24.942.925.752.523.846.8
 Current8.113.712.09.78.08.2
Physical activity (%)
 None19.721.220.819.815.919.0
 Low20.618.620.115.822.220.2
 Moderate36.232.536.341.437.636.0
 High23.627.622.923.024.324.9
  • aNumbers are prior to exclusions of people with missing data, because exclusions differ by cancer site.

  • bBatch- and season-adjusted plasma-equivalent concentrations of 25(OH)D measured in dried blood spots.