Construct and criterion validity of the Comfort Assessment Breast Cancer Instrument

Abstract Objective To examine the validity of the Comfort Assessment Breast Cancer Instrument (CABCI) and compare the results of CABCI with that of salivary cortisol examination. Method For assessing construct validity, second-order confirmatory factor analysis (CFA) was performed with M-Plus, and for assessing criterion validity, salivary cortisol examination was performed. Results The results of CFA indicated that the model was a good fit ( X 2  = 283.654, df  = 10, p  = 0.000, RMSEA = 0.000, p RMSEA ≤0.05 = 0.797, CFI = 1.000), and the 33 items of CABCI were found to be statistically significant ( t  > 1.96; p r  = 0.416; p  = .016). Conclusion The study proves the construct and criterion validity of CABCI, and therefore indicates its validity for predicting discomfort in breast cancer patients.