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Table 5 Reliability analysis showing the test-retest effect sizes and intra-class correlation coefficient (ICC) and internal consistency

From: Development and psychometric evaluation of a Dutch-translated shorter Breast Cancer Treatment Outcome Scale (Dutch BCTOS-13)

  Test re-test reliability (n = 93) Correlation, Internal consistency a  
BCTOS item Test Re-test Effect size ICC [95% CI] Cronbach’s α
  Mean SD Mean SD Cohen’s d Test re-test, n = 93 Item-subscale totalabn = 101 n = 101
Cosmetic subscalea 1.95 0.69 1.88 0.61 0.112 0.89 [0.84–0.93]   0.89
1 Breast texture (hardening) 2.06 0.92 2.03 0.83 0.034 0.82 [0.74–0.87] 0.79 [0.69–0.85]  
2 Nipple appearance 1.93 1.08 1.86 1.05 0.074 0.85 [0.78–0.90] 0.60 [0.45–0.72]  
3 Breast elevation/position 1.86 1.00 1.81 0.92 0.053 0.76 [0.66–0.84] 0.65 [0.52–0.75]  
4 Scar tissue 2.12 0.94 2.09 0.86 0.034 0.82 [0.74–0.88] 0.60 [0.45–0.71]  
5 Breast swelling 1.62 0.91 1.50 0.79 0.132 0.83 [0.75–0.89] 0.62 [0.39–0.76]  
6 Fit of bra 1.84 0.93 1.71 0.90 0.130 0.76 [0.66–0.84] 0.75 [0.65–0.83]  
7 Breast sensitivity 2.15 0.99 2.05 0.94 0.099 0.72 [0.60–0.80] 0.70 [0.56–0.79]  
8 Overall skin appearance 1.85 0.88 1.70 0.78 0.172 0.79 [0.69–0.86] 0.77 [0.67–0.84]  
9 Breast tenderness 2.11 0.97 2.07 0.93 0.043 0.79 [0.71–0.86] 0.63 [0.49–0.74]  
Functional subscalea 1.46 0.73 1.43 0.67 0.032 0.90 [0.86–0.93]   0.90
10 Arm heaviness 1.49 0.87 1.51 0.85 0.024 0.84 [0.78–0.89] 0.92 [0.88–0.95]  
11 Shoulder discomfort 1.49 0.93 1.48 0.87 0.011 0.83 [0.75–0.88] 0.84 [0.77–0.89]  
12 Arm discomfort 1.60 0.89 1.55 0.87 0.058 0.86 [0.80–0.90] 0.91 [0.86–0.94]  
13 Arm swelling 1.24 0.58 1.19 0.47 0.090 0.87 [0.81–0.91] 0.78 [0.69–0.85]  
All itemsa 1.80 0.62 1.74 0.56 0.105 0.91 [0.87–0.94]   0.90
  1. aanalysis performed for the new BCTOS-13 banalysis performed on test