The German 12-Item Brief Form of the Cancer Behavior Inventory (CBI-B-D-12): Factor Structure, Reliability, and...

Area of Science:

• Psychology
• Oncology
• Psychometrics

Background:

• The Cancer Behavior Inventory Brief Form (CBI-B) assesses self-efficacy in cancer patients.
• Previous psychometric analyses exist for other language versions, but not the German version.

Purpose of the Study:

• To analyze the factor structure, internal consistency, and criterion validity of the German 12-item version of the Cancer Behavior Inventory Brief Form (CBI-B-D-12).

Main Methods:

• Confirmatory factor analyses were conducted on a pooled sample of 1034 cancer patients.
• Internal consistency was assessed using Cronbach's α and McDonald's ω.
• Criterion validity was determined through correlations with quality of life, anxiety, depression, fear of progression, and fatigue measures.

Main Results:

• A 4-factor model showed a good fit, aligning with the original instrument's dimensions of coping self-efficacy.
• High internal consistency was found (Cronbach's α = 0.89, McDonald's ω = 0.88).
• Criterion correlations supported the scale's validity.

Conclusions:

• The German CBI-B-D-12 is a reliable and valid measure of cancer patients' coping self-efficacy.
• Its factorial structure and correlations with distress and quality of life criteria are supported.
• The instrument is suitable for clinical practice and psycho-oncological research.