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Table 4 Reliability and measurement error of the scores on FES(S) and SAFFE, n = 71

From: Assessment of fall-related self-efficacy and activity avoidance in people with Parkinson's disease

Cronbach's alpha 0.97/0.99 a 0.95/0.96 a
ICC (95% CI) 0.87 (0.79-0.92) 0.92 (0.86-0.95)
SEM 12.3 2.4
  1. a For time 1/time 2.
  2. ICC: Intraclass Correlation Coefficient (two-way random effects model, absolute agreement).
  3. CI: Confidence interval.
  4. SEM: Standard Error of Measurement; SD 1 r (SD: standard deviation of baseline values; r = ICC).
  5. Missing data: Cronbach's alpha can only be calculated for those without any missing item values and where total scores can be computed (see Tables 2 and 3). ICC values were calculated for those having total scores for both test and retest. For FES(S), this applied for 58 participants whereas the corresponding number for SAFFE was 57.