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Table 3 Estimates for test-retest reliability (ICC) of the SA-PCS

From: Cross-cultural adaptation and validation of the South African Pain Catastrophizing Scale (SA-PCS) among patients with fibromyalgia

SA-PCS N Max score PCS Test Mean (SD) PCS Retest Mean (SD) MD *t2-t1 ICC (95% CIs) SEM MDC p
Afrikaans SA-PCS 26 52 37.0 (11.4) 36.8 (11.3) −0.23 0.91 (0.81-0.96) 3.3 9.0 0.71
Rumination   16 10.2 (3.6) 10.4 (3.6) 0.15 0.88 (0.75-0.94) 1.7 4.7 0.24
Helplessness   24 17.9 (5.0) 17.9 (4.9) 0.01 0.87 (0.74-0.94) 1.8 4.9 0.36
Magnification   12 8.2 (2.9) 8.4 (2.9) 0.15 0.86 (0.72-0.94) 1.1 2.9 0.37
English SA-PCS 22 52 38.2 (11.5) 39.1 (11.5) 0.82 0.90 (0.78-0.96) 3.2 8.8 0.93
Rumination   16 10.34 (3.5) 10.4 (3.6) 0.07 0.88 (0.71-0.94) 1.2 3.3 0.77
Helplessness   24 18.2 (4.9) 18.1 (4.7) −0.10 0.87 (0.79-0.92) 1.7 4.8 0.68
Magnification   12 8.4 (2.7) 8.5 (2.7) 0.09 0.86 (0.70-0.94) 1.0 2.8 0.57
Xhosa SA-PCS 19 52 34.2 (8.5) 32.9 (8.8) −1.27 0.89 (0.74-0.96) 3.3 9.3 0.79
Rumination   16 10.5 (3.5) 10.7 (3.5) 0.20 0.88 (0.71-0.95) 1.2 3.4 0.37
Helplessness   24 18.2 (4.8) 18.1 (4.6) −0.15 0.86 (0.67-0.94) 1.7 4.9 0.59
Magnification   12 8.4 (2.7) 8.6 (2.6) 0.11 0.84 (0.63-0.93) 1.0 2.9 0.52
  1. *t2-t1 = mean difference between test and retest scores; ICC = intraclass correlation coefficient; SEM = standard error of measurement;
  2. MDC = minimum change difference; MD = mean difference; 95% CIs = 95% confidence intervals.