Objective: The aim of this study was to investigate the predictive value of optimism/pessimism for anxiety, depression and health-related quality of life in female cancer patients, quantified with and without controlling the corresponding base level.
Methods: A total of 97 women with breast cancer and other gynaecological cancer completed the Life Orientation Test, the Hospital Anxiety and Depression Scale and the Health Survey SF-8 at three time points: during their stay in the hospital (T1), 2 weeks later (T2) and 3 months later (T3).
Results: The degree of self-assessed pessimism at T1 was significantly associated with anxiety, depression and health-related quality of life at T3. After controlling for the base levels of anxiety, depression and health-related quality of life, only the predictive value of pessimism remained significant and substantial.
Conclusions: Especially, women with a high level of pessimism are at risk for higher levels of anxiety and depression in addition to lowered health-related quality of life in the course of the disease. The results indicate that it seems to be more important not to be pessimistic than to be optimistic.