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Table 2 Test-retest results presented as the Intraclass Correlation Coefficient, ICC, for the 6 items of the new symptoms scale AF6 and for the SF-36 domains.

From: Validity and reliability of a new, short symptom rating scale in patients with persistent atrial fibrillation

  ICC (AF at 12 ± 3 days) Lower 95% CI limit for ICC
New symptoms scale   
Dyspnoea at rest 0.82 0.61
Dyspnoea on exertion 0.88 0.72
Limitations in daily life due to AF 0.19 Neg
Discomfort due to AF 0.04 Neg
Fatigue due to AF 0.39 Neg
Anxiety due to AF 0.93 0.83
SF-36 domains   
Physical functioning 0.84 0.64
Role – Physical 0.56 0.17
Bodily pain 0.50 0.09
General Health 0.75 0.45
Vitality 0.77 0.49
Social functioning 0.54 0.14
Role – Emotional 0.57 0.18
Mental Health 0.95 0.10
  1. In general, the ICC values of AF6 are lower than the SF-36 values