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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