Table 3.

AHRs for vitamin D intake on RFS and OS by surgery season (n = 321)

Surgery seasonVitamin D intake (IU/d)
n<239239-362363-595≥596Ptrend
RFS
    Overall32110.77 (0.52-1.15)0.76 (0.50-1.17)0.85 (0.56-1.28)0.66
    Winter10010.27 (0.12-0.62)0.46 (0.21-1.01)0.72 (0.37-1.43)0.46
    Spring + fall11911.70 (0.82-3.49)1.66 (0.81-3.38)1.54 (0.75-3.16)0.37
    Summer10210.63 (0.31-1.31)0.37 (0.17-0.81)0.30 (0.13-0.70)<0.01
    Summer*10210.79 (0.39-1.59)0.35 (0.15-0.82)0.28 (0.10-0.80)<0.01
    Summer10211.20 (0.56-2.59)0.47 (0.22-1.01)0.37 (0.16-0.85)<0.01
OS
    Overall32110.73 (0.47-1.13)0.68 (0.43-1.10)0.77 (0.50-1.21)0.44
    Winter10010.29 (0.13-0.70)0.23 (0.08-0.64)0.68 (0.33-1.41)0.84
    Spring + fall11911.34 (0.60-2.98)1.78 (0.82-3.87)1.34 (0.62-2.88)0.42
    Summer10210.75 (0.35-1.60)0.50 (0.22-1.13)0.29 (0.11-0.75)<0.01
    Summer*10210.92 (0.43-1.96)0.50 (0.22-1.17)0.26 (0.08-0.79)<0.01
    Summer10211.67 (0.73-3.83)0.40 (0.17-0.92)0.34 (0.14-0.88)<0.01
  • NOTE: Adjusted for age, gender, stages, smoking status, and surgery season in Cox proportional hazards model, with vitamin D intake <239 IU/d as the reference group, with the values expressed as AHRs (95% CI).

  • * Adjusted for age, gender, stages, and retinol intake in Cox proportional hazards model.

  • Dietary vitamin D intake only, with the quartiles of <200, 200-273, 274-378, and ≥379 IU/d, respectively. Adjusted for age, gender, and stages in Cox proportional hazards model, with dietary vitamin D intake <200 IU/d as the reference group, and the values expressed as AHRs (95% CI).