Reliability, validity, and sensitivity of the Chinese Life Attitude Self-rating Questionnaire for Breast Cancer.

ABSTRACT

RATIONALE, AIMS AND OBJECTIVES: Psychometrics of the Chinese Life Attitude Self-rating Questionnaire for Breast Cancer (LASQ-BC) has not yet been conducted in a larger sample of women with breast cancer. This study aimed to examine the reliability, validity, and sensitivity of the LASQ-BC in Chinese mainland female breast cancer patients. METHOD: This is a cross-sectional study. Reliability was determined by Cronbach's α and Guttman split-half coefficient. Convergent and discriminant validity were evaluated via item-subscale and item-total score correlations. Factorial validity was estimated using a principal component analysis with varimax rotation. Sensitivity was identified via Cohen's effect size (ES) and an independent sample t-test between the new and recurrent cases. Multiple linear regression analysis was used to further examine sensitivity of the LASQ-BC under the influence of newly diagnosed breast cancer (yes vs. no). RESULTS: A total of 429 patients completed the questionnaire. Cronbach's α of the LASQ-BC was 0.96, ranging from 0.86 to 0.92 for the four subscales (i.e., choice and responsibility, life meaning, benevolence, and life experiences). The Guttman split-half coefficient was 0.90. The hypothesised item-subscale and item-total score correlations were higher than the critical value of 0.50. Four factors were extracted from the 23 items, explaining 69.29% of the total variance. Eligible ES (range 0.38-0.48) was found in the four subscales and total score between the new and recurrent cases (independent sample t-test), and under the influence of newly diagnosed breast cancer (yes vs. no; multiple linear regression analysis). CONCLUSION: The Chinese LASQ-BC has acceptable reliability, validity, and sensitivity in women with breast cancer of mainland China. It can be used to female breast cancer patients as an invaluable metric and a crucial instrument for assessing and discerning those grappling with a suboptimal life attitude, and in gauging the efficacy of psychological interventions tailored to enhance this perspective.