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Table 4 Standard error of measurement (SEM) and smallest detectable change (SDC) for the three instrumentsa (n = 182)

From: Evaluation of three patient reported outcome measures following operative fixation of closed ankle fractures

Instrument n Test mean (SD) Retest mean (SD) SEMb SDCcindividual SDCcgroup
LEFS (0–80)c 179 68.54 (15.03) 69.03 (15.14) 4.50 12.49 0.93
LEFS adjusted 181 85.48 (18.39) 86.19 (18.41) 5.61 15.55 1.16
SEFAS (12–60)b 172 19.70 (8.99) 19.49 (9.23) 2.39 6.62 0.50
SEFAS adjusted 182 83.85 (18.52) 84.11 (19.01) 5.09 14.10 0.93
OMAS 140 78.04 (24.44) 79.64 (24.29) 6.87 19.04 0.92
OMAS adjusted 176 77.66 (24.38) 78.85 (23.90) 7.41 20.55 1.55
  1. aInstruments scored 0–100 unless otherwise stated
  2. bStandard error of measurement
  3. cSmallest detectable change
  4. bIncluded for comparison with existing studies that have used the same scoring