Cytokines, Fatigue, and Cutaneous Erythema in Early Stage Breast Cancer Patients Receiving Adjuvant Radiation Therapy

Table 4

Step  2—Heckman model: parameters estimation of correlation between fatigue and proinflammatory cytokines levels.

Variable	Coefficient	Standard Error	𝑃 value
Probit model for the fatigue
Intercept	−8.574	3.460	0.0132
Breast volume	0.004	0.003	NS
Inflammatory markers	3.075	1.381	0.0260
Hormone therapy	1.975	1.923	NS
Mi	1.967	0.875	0.0246
𝜎^2𝑢	6.722

NS: not significant.