Figure 4From: Impact of partial versus whole breast radiation therapy on fatigue, perceived stress, quality of life and natural killer cell activity in women with breast cancer Effect of quality of life on inter-individual differences in the intercept for NKCA. Graphical representation of the relationship between quality of life (FACT-G scores) and natural killer cell activity (NKCA) as estimated by the hierarchical linear model from the time of the initial assessment (i.e., Baseline) to 6 weeks post radiotherapy . The slopes for NKCA were based on differences in quality of life levels, calculated as the average upper and lower quartiles. Greater levels of NKCA at baseline and post-treatment were associated with higher quality of life. *bintercept = 1.9, p = 0.02.Back to article page