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Table 1 Patient characteristics according to quartile of serum 25OHD (n = 257)

From: Serum vitamin D levels and survival of patients with colorectal cancer: Post-hoc analysis of a prospective cohort study

  Quartile 1 (3-7 ng/mL) n = 71 Quartile 2 (8-10 ng/mL) n = 58 Quartile 3 (11-15 ng/mL) n = 65 Quartile 4 (16-36 ng/mL) n = 63 P value
Serum 25OHD, ng/mL, mean ± SD 5.2 ± 1.7 9.0 ± 0.8 12.6 ± 1.4 21.9 ± 5.2  
Age at surgery, years 64 ± 15 66 ± 13 65 ± 12 65 ± 10 0.76*1
Gender, % female 41 43 34 26 0.18*2
Stage, %      0.78*2
Stage I 21 17 18 24  
Stage II 23 31 37 22  
Stage III 35 32 31 35  
Stage IV 21 20 14 19  
Location of tumor,%      0.24*2
Proximal colon 38 44 40 27  
Distal colon 32 19 18 23  
Rectum 30 37 42 50  
Type of resection, %      0.84*2
R0 76 79 82 81  
R1 9 10 8 4  
R2 15 11 10 15  
Number of lymph nodes with metastasis 2.2 ± 4.0 3.0 ± 6.8 2.2 ± 4.0 1.6 ± 3.0 0.87*3
Time period of surgery      < 0.001*2
May 2003 - December 2005 27 43 55 65  
January 2006 - January 2008 73 57 45 35  
  1. *1: P value was calculated using one-way analysis of variance.
  2. *2: P value was calculated using chi-square test.
  3. *3: P value was calculated using Kruskal-Wallis rank test.
  4. R0, no residual tumor; R1, microscopic residual tumor; R2, macroscopic residual tumor.