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Table 4 Reliability data for the PPME

From: A systematic review of mobility instruments and their measurement properties for older acute medical patients

Author Population and test procedures Scoring System ICC (95%CI) Standard deviation (SD) SEM MDC90
Intra-rater reliability
Winograd et al. [29] 50 hospitalised patients, mean age 74.8 (SD = 7.9). Tested 48 hours apart. If the patient reported or the chart indicated a change in condition, the patient was excluded. This study included 33 patients. Pass-fail scoring system. 0.99* Pooled SD not provided. Baseline SD 2.1 for sample 1 (n = 146) and 1.7 for sample 2 (n = 352). Weighted average SD = 1.8. 0.18 0.42
Winograd et al. [29] As above. 3 level scoring system. 0.98# Pooled SD not provided. Baseline SD 2.8 for sample 1 (n = 146) and 3.1 for sample 2 (n = 352). Weighted average SD = 3.0. 0.42 0.97
Sherrington and Lord [39] Test retest of 30 older people, mean age 81.1 years (SD = 7.5) following hip fracture (16 rehabilitation hospital inpatients and 14 community dwelling). Two assessments one day apart. 3 level scoring system. 0.96# (0.92 -0.98) Test 1 SD = 2.4 and test 2 SD = 2.2. Weighted average SD = 2.3. 0.46 1.07
Inter-rater reliability
Winograd et al. [29] 31 patients, mean age 75 (SD = 6.43), selected from (1) acute medical unit inpatients that had impaired mobility and (2) acute medical and surgical inpatients aged ≥ 65 years. Two assessors independently rated each patient's performance on the PPME. Pass-fail scoring system. 0.99 Pooled SD not provided. Baseline SD 2.1 for sample 1 (n = 146) and 1.7 for sample 2 (n = 352). Weighted average SD = 1.8. 0.18 0.42
Winograd et al. [29] As above. 3 level scoring system. 0.99 Pooled SD not provided. Baseline SD 2.8 for sample 1 (n = 146) and 3.1 for sample 2 (n = 352). Weighted average SD = 3.0. 0.3 0.7
  1. SD = standard deviation, ICC = intraclass correlation coefficient
  2. * Phi coefficient, #ICC (3,1)