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Table 2 Description of the outcome measures used in 20 randomised controlled trials and how they are scaled/scored

From: Sample size estimation for randomised controlled trials with repeated assessment of patient-reported outcomes: what correlation between baseline and follow-up outcomes should we assume?

  Outcome name Trials Score range Correlations Reference
1 B-IPQ 1 0 to 10 2 [28]
2 Back Pain VAS 1 0 to 10 3 [29]
3 Barthel score 1 0 to 20 2 [30]
4 BPRS 1 0 to 126 2 [31]
5 CORE Life functioning dimension 1 0 to 4 3 [32]
6 CORE Risk/harm dimension 1 0 to 4 3  
7 CORE Problems/symptoms dimension 1 0 to 4 3  
8 CORE Subjective well-being dimension 1 0 to 4 3  
9 CORE total score 1 0 to 4 3  
10 EORTC Appetite Loss 1 0 to 100 4 [33]
11 EORTC Cognitive Functioning 1 0 to 100 4  
12 EORTC Constipation 1 0 to 100 4  
13 EORTC Diarrhoea 1 0 to 100 4  
14 EORTC Dyspnoea 1 0 to 100 4  
15 EORTC Emotional Functioning 1 0 to 100 4  
16 EORTC Fatigue 1 0 to 100 4  
17 EORTC Financial Difficulties 1 0 to 100 4  
18 EORTC Insomnia 1 0 to 100 4  
19 EORTC Nausea 1 0 to 100 4  
20 EORTC Pain 1 0 to 100 4  
21 EORTC Physical Functioning 1 0 to 100 4  
22 EORTC QoL 1 0 to 100 4  
23 EORTC Role Functioning 1 0 to 100 4  
24 EORTC Social Functioning 1 0 to 100 4  
25 EPDS 1 0 to 30 2 [34]
26 EQ-5D Utility score 12 −0.56 to 1.00 29 [35]
27 EQ-5D VAS 8 0 to 100 21 [36]
28 GSES 2 10 to 40 3 [37]
29 Leg Pain VAS 1 0 to 10 3 [29]
30 MFI General Fatigue 1 4 to 20 1 [38]
31 MFI Mental Fatigue 1 4 to 20 1  
32 MFI Physical Fatigue 1 4 to 20 1  
33 MFI Reduced Activity 1 4 to 20 1  
34 MFI Reduced Motivation 1 4 to 20 1  
35 ODI 1 0 to 100 3 [39]
36 ONS Well-Being 1 0 to 40 1 [40]
37 PHQ-9 4 0 to 27 6 [41]
38 PISQ-31 Behaviour/Emotion 1 0 to 61 1 [42]
39 PISQ-31 Partner-Related Factor 1 0 to 24 1  
40 PISQ-31 Physical Factor 1 0 to 40 1  
41 PISQ-31 total score 1 0 to 125 1  
42 SF-36 General Health 11 0 to 100 29 [43]
43 SF-36 Mental Health 11 1 to 100 29  
44 SF-36 Pain 11 1 to 100 29  
45 SF-36 Physical Functioning 11 1 to 100 29  
46 SF-36 Role-Emotional 11 1 to 100 29  
47 SF-36 Role-Physical 11 1 to 100 29  
48 SF-36 Social Functioning 11 1 to 100 29  
49 SF-36 Vitality 11 1 to 100 29  
50 SF-36 Health Change 1 1 to 100 2  
51 SF-36 Mental Component Summary 7 NBS 17 [44]
52 SF-36 Physical Component Summary 7 NBS 17  
53 SF-6D 4 0.29 to 1.00 14 [45]
54 Sleep Apnoea QoL 1 1 to 7 5 [46]
55 SPADI Disability 1 0 to 100 3 [47]
56 SPADI Pain 1 0 to 100 3  
57 SPADI total score 1 0 to 100 3  
58 VAS Pain 1 0 to 10 4 [48]
59 WOMAC Pain 1 0 to 20 1 [49]
60 WOMAC Physical Function 1 0 to 68 1  
61 WOMAC Stiffness 1 0 to 8 1  
  1. NBS norm-based scoring: scores are standardised to have a mean of 50 and SD of 10