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. Author manuscript; available in PMC: 2016 Oct 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2015 Jun 14;93(2):418–424. doi: 10.1016/j.ijrobp.2015.06.014

Table 2.

Patient and tumor characteristics predicting chest wall pain

Characteristic CPH model
HR		 CPH model
HR 95%
confidence
interval		 P
Univariate variable
  V30 Gy (cm3) 1.013 1.009–1.017 <.001
  D83cc (Gy) 1.080 1.051–1.109 <.001
  Prescription
    dose (Gy)		 1.085 1.042–1.130 <.001
  Prescription dose
    (Gy)/fraction		 1.105 1.042–1.172 <.001
  No. of fractions 0.625 0.439–0.889 .0075
  Tumor distance to
    CW (cm)		 0.595 0.418–0.846 .0014
  BMI (kg/m2) 1.041 1.001–1.082 .031
  KPS 0.980 0.961–1.000 .25
  Gender 0.835 0.502–1.390 .48
  Age (y) 0.990 0.971–1.010 .83
Multivariate variables
  Trivariate model
    V30 Gy (cm3) 1.127 1.123–1.132 <.001
    BMI (kg/m2) 1.041 1.001–1.082 .028
    Prescription
    dose (Gy)		 1.053 1.011–1.098 .010
  Bivariate model
    VNTD99Gy (cm3) 1.018 1.012–1.023 <.001
    BMI (kg/m2) 1.042 1.003–1.082 .036

Abbreviations: CPH = Cox proportional hazards; HR = hazard ratio.

Other abbreviations as in Table 1.