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. Author manuscript; available in PMC: 2017 Apr 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2016 Jan 25;25(4):665–669. doi: 10.1158/1055-9965.EPI-15-0991

Table 2. Selected baseline characteristics [medians (interquartile range) or number (percent)] by season-specific quintile of serum 25(OH)D, ATBC Study.

Season-Specific Quintile of Serum 25(OH)D p-value

Characteristic Q1 (n=166) Q2 (n=203) Q3 (n=206) Q4 (n=187) Q5 (n=237)

Age at blood collection (years) 58 (54 – 62) 57 (53 – 61) 56 (53 – 62) 57 (53 – 61) 59 (55 – 63) 0.02
Age at diagnosis (years) 69 (66 – 73) 69 (65 – 73) 69 (66 – 73) 69 (65 – 73) 70 (67 – 74) 0.02
Height (cm) 173 (169 – 177) 173 (170 – 178) 174 (170 – 179) 174 (170 – 178) 174 (171 – 178) 0.61
Weight (kg) 75.6 (69.0 – 84.3) 77.2 (71.0 – 88.0) 77.7 (70.5 – 86.7) 80.0 (71.4 – 87.8) 78.5 (72.1 – 86.2) 0.23
BMI (kg/m2) 25.8 (23.6 – 28.2) 26.1 (23.6 – 28.8) 26.0 (23.9 – 28.3) 26.1 (24.5 – 28.3) 25.7 (24.2 – 28.4) 0.50
Cigarettes per day 20 (13 – 30) 20 (15 – 25) 20 (15 – 25) 20 (15 – 25) 20 (14 – 25) 0.44
Physically active 18 (10.8) 42 (20.7) 40 (19.4) 42 (22.5) 53 (22.4) 0.06
History of diabetes 7 (4.2) 5 (2.5) 3 (1.5) 2 (1.1) 5 (2.1) 0.35
Family history of prostate cancer 11 (6.6) 6 (3.0) 3 (1.5) 15 (8.0) 17 (7.2) 0.005
Energy intake (kcal/day) 2,600 (2,104 – 3,261) 2,643 (2,150 – 3,197) 2,614 (2,206 – 3,124) 2,613 (2,125 – 3,130) 2582 (2,201 – 3,160) 0.99
Dietary vitamin D (IU/day) 3.5 (2.4 – 4.9) 4.1 (2.9 – 6.2) 4.9 (3.3 – 6.5) 4.9 (3.6 – 6.7) 5.9 (4.2 – 8.4) <0.0001
Dietary calcium (mg/day) 1,326 (974 – 1,825) 1,329 (966 – 1,725) 1,306 (1,006 – 1,708) 1,377 (1.044 – 1.703) 1,351 (1,003 – 1,710) 0.85
Ethanol intake (g/day) 9.3 (1.6 – 22.9) 9.7 (1.9 – 24.5) 12.1 (2.3 – 27.1) 10.6 (3.4 – 24) 11.8 (3.3 – 22.9) 0.66
Supplemental vitamin D use 1 (0.6) 9 (4.4) 18 (8.7) 18 (9.6) 32 (13.5) 0.0005
Supplemental calcium use 15 (9.0) 17 (8.4) 24 (11.7) 21 (11.2) 39 (16.5) 0.11
Serum cholesterol (mmol/L) 6.2 (5.4 – 6.8) 6.2 (5.4 – 6.9) 6.2 (5.4 – 6.8) 6.3 (5.5 – 7.1) 6.1 (5.4 – 6.8) 0.71
Serum alpha-tocopherol (mg/L) 10.6 (8.6 – 12.9) 11.1 (9.8 – 13.3) 11.3 (9.8 – 13.3) 11.8 (10.2 – 13.9) 11.8 (10.3 – 13.4) <0.0001
Serum beta-carotene (μg/L) 147 (89 – 241) 169 (116 – 249) 186 (120 – 259) 196 (130 – 279) 213 (139 – 311) <0.0001
Serum retinol (μg/L) 575 (497 – 634) 578 (506 – 666) 588 (512 – 682) 603 (515 – 684) 595 (531 – 686) 0.21
Serum 25(OH)D (nmol/L) 14.2 (10.5 – 18.4) 22.7 (20.0 – 29.9) 30.8 (27.3 – 39.8) 41.3 (37.4 – 50.3) 64.1 (53.9 – 74.3) -
Time from baseline to diagnosis (years) 11.5 (8.1 – 14.5) 12.7 (8.0 – 15.1) 12.7 (9.0 – 15.8) 12.8 (8.2 – 15.0) 12.8 (9.4 – 15.7) 0.19
Time from diagnosis to death or end of follow-up (years) 3.9 (1.8 – 8.2) 4.7 (2.2 – 9.5) 6.6 (2.8 – 10.2) 6.6 (2.6 – 10.6) 6.3 (2.4 – 10.8) 0.0003
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