The online version of this article (https://doi.org/10.1186/s12885-017-3865-5) contains supplementary material, which is available to authorized users.
Body image is a complex post-treatment concern among female patients with breast cancer, and various tools have been developed and applied to measure this multifaceted issue. However, these available tools were developed in other countries and only a few have been modified into Chinese versions. Furthermore, body-image evaluation instruments that are specific to Chinese mainland female patients with breast cancer have not been devised yet. Therefore, we developed the Body Image Self-rating Questionnaire for Breast Cancer for Chinese mainland female patients with breast cancer.
We performed two rounds of the Delphi technique and a cross-sectional pilot survey. Items were selected using a Likert scale (1–5) to determine ratings of importance (i.e., the significance of the item from experts’ perspective; coefficients of variation ≤0.25), internal consistency reliability (Cronbach’s α ≥ 0.70), convergent validity (hypothesized item-subscale correlations ≥0.40), and discriminant validity (stronger correlations of the item with the hypothesized subscale than for other subscales). All decisions on items were made based on statistical analysis results, experts’ recommendations, and in-depth discussion among researchers.
Twenty-five eligible experts completed the two Delphi rounds (mean age: 42.20 ± 8.90 years). Over half the experts were professors (56%, n = 14) or worked as clinical staff (68%, n = 17). Twenty (mean age = 49.55 ± 10.01 years) and 50 patients (mean age = 48.44 ± 9.98 years) completed the first- and second-round survey, respectively. Over half the patients had a tertiary education level, were married, and were employed. Regarding the revised questionnaire (comprising 33 items across seven subscales), the expert panelists’ ratings of each item met the criteria (Kendall’s W = 0.238, p < .001). Five subscales had a Cronbach’s α value over 0.60 (range: 0.62–0.69) and two subscales were over 0.80 (range: 0.84–0.88). All items satisfied the criteria for convergent and discriminant validity.
The findings of this study provide evidence of a suitable tool for body image evaluation among Chinese mainland female patients with breast cancer. Studies with larger sample sizes should be conducted to validate this questionnaire in this patient population.
Additional file 1: Summary of the Item Selection Procedure and Corresponding Revisions. (DOC 112 kb)12885_2017_3865_MOESM1_ESM.doc
Additional file 2: Results from the Delphi Technique (Round 1). (DOC 74 kb)12885_2017_3865_MOESM2_ESM.doc
Additional file 3: Results for Cronbach’s α (Round 1). (DOC 63 kb)12885_2017_3865_MOESM3_ESM.doc
Additional file 4: Results of Convergent and Discriminant Validity (Round 1). (DOC 84 kb)12885_2017_3865_MOESM4_ESM.doc
Additional file 5: Results from the Delphi Technique (Round 2). (DOC 62 kb)12885_2017_3865_MOESM5_ESM.doc
Additional file 6: Results for Cronbach’s α (Round 2). (DOC 58 kb)12885_2017_3865_MOESM6_ESM.doc
Additional file 7: Results of Convergent and Discriminant Validity (Round 2). (DOC 78 kb)12885_2017_3865_MOESM7_ESM.doc
Additional file 8: Body Image Self-rating Questionnaire for Breast Cancer (BISQ-BC). (DOC 79 kb)12885_2017_3865_MOESM8_ESM.doc
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- Development of the body image self-rating questionnaire for breast cancer (BISQ-BC) for Chinese mainland patients
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