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Table 3 Results of duplicate (Groups 1–4) and single (Group 5) ABI measurements

From: A new efficient trial design for assessing reliability of ankle-brachial index measures by three different observer groups

  Gr1 Gr2 Gr3 Gr4 Gr5 Total p-value Gr1-Gr3
ABI         
- N 36 36 36 36 45 189   108
- Mean 1.10 1.08 1.11 1.06 1.04 1.08 0.055 1.10
- SD 0.09 0.11 0.10 0.13 0.17 0.13   0.10
- Min 0.94 0.74 0.92 0.6 0.52 0.52   0.74
- Max 1.35 1.32 1.37 1.24 1.27 1.37   1.37
- Missing 0 0 0 0 0 0   0
ABI         
< 0.90 0 (0%) 2 (5.6%) 0 (0%) 5 (13.9%) 8 (17.8%) 15 (7.9%) 0.003 2 (1.9%)
>= 0.90 36 (100%) 34 (94.4%) 36 (100%) 31 (86.1%) 37 (82.2%) 174 (92.1%)   106 (98.2%)
Missing 0 0 0 0 0 0   0
  1. p-values: Fisher's exact test, analysis of variance