. Author manuscript; available in PMC: 2012 Mar 1.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2010 Apr 17;79(3):800–807. doi: 10.1016/j.ijrobp.2009.11.010

Table 4.

Univariate analysis of factors associated with WBC nadir in the validation cohort

	WBC Nadir (k/μL)
	β	95% CI	p
V₁₀	−0.060	−0.10, −0.02	0.009^*
V₂₀	−0.044	−0.08, −0.01	0.010^*
V₃₀	−0.035	−0.06, −0.01	0.020^*
V₄₀	−0.036	−0.07, −0.004	0.029^*
Mean Pelvic Bone Marrow Dose	−0.131	−0.21, −0.05	0.002^*
log(BMI)	0.917	−0.07, 1.90	0.068
Age	0.002	−0.02, 0.02	0.798
Black Race	−0.347	−0.94, 0.24	0.244
Stage	−0.06	−0.63, 0.52	0.836
Comorbidity	0.051	−0.49, 0.60	0.852

CI: confidence interval; WBC: white blood cell count; β: regression coefficient (e.g., 1% increase in V₂₀ corresponds to a reduction in WBC nadir of 0.044 k/μL); BMI: body mass index.

statistically significant