Table 4. Values of internal consistency, reproducibility and floor or ceiling effects.
| Instruments | Internal consistency | Reproducibility | Floor or ceiling effects | |||
|---|---|---|---|---|---|---|
| Cronbach’s alpha (Cronbach’s alpha if an item was deleted) | ReliabilityICC2,1 (95% CI) | Agreement SEM (%) | Agreement SDC | Floor (%) | Ceiling (%) | |
| SF-36 - Dimensions | ||||||
| Physical functioning (0-100) | 0.88 (0.85-0.87) | 0.77 (0.68 to 0.84) | 11.28 (11.28) | 26.24 | 0.0 | 6.6 |
| Role-physical (0-100) | 0.91 (0.87-0.89) | 0.55 (0.40 to 0.68) | 23.24 (23.24) | 54.06 | 68.9 | 13.2 |
| Role-emotional (0-100) | 0.88 (0.77-0.91) | 0.39 (0.21 to 0.54) | 34.52 (34.52) | 80.30 | 33 | 44.3 |
| Bodilypain (0-100) | 0.76 (-)1 | 0.58 (0.42 to 0.70) | 15.17 (15.17) | 35.28 | 0.9 | 5.7 |
| General health perceptions (0-100) | 0.70 (0.56-0.69) | 0.74 (0.63 to 0.82) | 8.82 (8.82) | 20.51 | 0.0 | 7.5 |
| Vitality (0-100) | 0.82 (0.75-0.80) | 0.73 (0.62 to 0.81) | 10.66 (10.66) | 24.81 | 0.0 | 1.9 |
| Social functioning (0-100) | 0.56 (-)1 | 0.52 (0.37 to 0.66) | 16.73 (16.73) | 38.91 | 0.9 | 17 |
| Mental health (0-100) | 0.82 (0.77-0.81) | 0.71 (0.60 to 0.78) | 10.37 (10.37) | 24.12 | 0.0 | 0.0 |
| WHOQOL-bref - Domains | ||||||
| Physical health (0-100) | 0.83 (0.76-0.84) | 0.80 (0.72 to 0.87) | 7.39 (7.39) | 17.18 | 0.0 | 0.9 |
| Psychological (0-100) | 0.78 (0.74-0.80) | 0.87 (0.81 to 0.91) | 6.06 (6.06) | 14.10 | 0.0 | 0.9 |
| Social relationships (0-100) | 0.68 (0.47-0.78) | 0.76 (0.66 to 0.82) | 9.46 (9.46) | 22.01 | 0.9 | 5.7 |
| Environment (0-100) | 0.75 (0.70-0.75) | 0.80 (0.71 to 0.87) | 5.77 (5.77) | 13.43 | 0.0 | 0.0 |
| FACT-B+4 - Scales | ||||||
| Physical well-being (0-28) | 0.75 (0.68-0.76) | 0.62 (0.50 to 0.73) | 2.97 (10.60) | 6.93 | 0.0 | 3.8 |
| Social/family well-being (0-28) | 0.85 (0.80-0.88) | 0.76 (0.60 to 0.86) | 2.46 (8.78) | 5.73 | 0.0 | 10.4 |
| Emotional well-being (0-24) | 0.67 (0.57-0.67) | 0.72 (0.61 to 0.80) | 1.79 (7.45) | 4.19 | 0.0 | 11.3 |
| Functional well-being (0-28) | 0.84 (0.80-0.85) | 0.62 (0.50 to 0.73) | 3.25 (11.60) | 7.57 | 0.9 | 1.9 |
| Breast cancer subscale(0-36) | 0.66 (0.60-0.67) | 0.71 (0.60 to 0.80) | 2.94 (8.16) | 6.87 | 0.0 | 0.0 |
| Arm subscale (0-20) | 0.84 (0.79-0.85) | 0.75 (0.65 to 0.82) | 2.02 (10.10) | 4.71 | 0.9 | 9.4 |
| FACT-B+4 total score (0-164) | 0.88 (0.87–0.89) | 0.86 (0.80 to 0.90) | 7.07 (4.31) | 16.48 | 0.0 | 0.0 |
ICC (Intraclass Correlation Coefficient), CI (confidence interval), SEM (standard error of the measurement), SDC (smallest detectable change), SF-36 (Medical Outcomes Study 36 - Item Short - Form Health Survey), WHOQOL-bref (World Health Organization Quality of Life - bref), FACT-B+4 (Functional Assessment of Cancer Therapy - Breast plus Arm Morbidity). 1Insufficient number of items for calculating Cronbach's alpha if an item was deleted.