Table 4.
Summary of classical test theory psychometrics
| Module/scale | Items, no. | Cronbach’s alpha coefficient | Item-total correlations, mean (range) | Inter-scale Spearman’s coefficient, range | Missing data %, range of maximums | MEF %, range of maximums |
|---|---|---|---|---|---|---|
| BREAST-Q Breast Conserving Therapy module | ||||||
| Satisfaction with breast | 11 | 0.96 | 0.83 (0.75–0.89) | 0.22–0.57 | 0.1–1.0 | 33–68 |
| Adverse effects of radiation | 7 | 0.80 | 0.67 (0.58–0.73) | 0.25–0.39 | 0.5–1.2 | 72–83 |
| Psychosocial well-being | 10 | 0.95 | 0.85 (0.79–0.89) | 0.32–0.64 | 0.3–0.7 | 46–76 |
| Sexual well-being | 8 | 0.93 | 0.83 (0.59–0.89) | 0.30–0.64 | 0.5–1.7 | 20–38 |
| Physical well-being | 14 | 0.89 | 0.65 (0.41–0.74) | 0.21–0.36 | 0.2–1.5 | 44–81 |
| Satisfaction with information | 12 | 0.93 | 0.76 (0.70–0.83) | 0.21–0.49 | 0.2–1.9 | 41–76 |
| BREAST-Q Mastectomy module | ||||||
| Satisfaction with breast | 4 | 0.82 | 0.81 (0.73–0.86) | 0.44–0.67 | 0.2–4.9 | 31–41 |
| Psychosocial well-being | 10 | 0.95 | 0.85 (0.81–0.87) | 0.44–0.69 | 0.1–0.8 | 32–62 |
| Sexual well-being | 6 | 0.94 | 0.72 (0.52–0.82) | 0.34–0.69 | 0.3–1.5 | 26–49 |
| Physical well-being | 16 | 0.93 | 0.87 (0.78–0.93) | 0.34–0.44 | 0.2–1.5 | 43–83 |
| BREAST-Q Breast Reconstruction module | ||||||
| Satisfaction with breast | 16 | 0.96 | 0.78 (0.69–0.84) | 0.33–0.68 | 0.4–2.3 | 33–59 |
| Satisfaction with outcome | 7 | 0.89 | 0.79 (0.75–0.84) | 0.32–0.68 | 1.2–1.5 | 43–82 |
| Psychosocial well-being | 10 | 0.96 | 0.85 (0.78–0.89) | 0.28–0.73 | 0.2–0.7 | 35–64 |
| Sexual well-being | 6 | 0.94 | 0.87 (0.75–0.93) | 0.31–0.73 | 0.5–1.6 | 29–43 |
| Physical well-being | 16 | 0.92 | 0.69 (0.49–0.79) | 0.22–0.53 | 0.3–1.5 | 44–83 |
| Physical well-being (abdomen) | 8 | 0.88 | 0.74 (0.61–0.84) | 0.28–0.53 | 1.8–2.8 | 48–75 |
| Satisfaction with abdomen | 3 | 0.78 | 0.83 (0.82–0.85) | 0.28–0.47 | 1.9–2.5 | 35–50 |
| Satisfaction with information | 15 | 0.95 | 0.76 (0.68–0.81) | 0.22–0.33 | 0.2–1.7 | 33–77 |
| Common scales | ||||||
| Satisfaction with surgeon | 12 | 0.97 | 0.87 (0.76–0.92) | - | 0.2–0.7 | 72–88 |
| Satisfaction with medical team | 7 | 0.96 | 0.91 (0.87–0.93) | - | 1.4–2.0 | 77–85 |
| Satisfaction with office staff | 7 | 0.96 | 0.91 (0.87–0.93) | - | 1.3–1.8 | 77–84 |
MEF, maximum endorsement frequency.
*
This table was reprinted from The Breast, Vol 33, Sarah Fuzesi, Stefan J. Cano, Anne F. Klassen, Dunya Atisha, Andrea L. Pusic, Validation of the electronic version of the BREAST-Q in the army of women study, Pages No. 44e49, Copyright (2017), with permission from Elsevier