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Table 4 AUCs for ordinal observations with all possible predictive values

From: Diagnostic utility of joint fluid metal ion measurement for histopathological findings in metal-on-metal hip replacements

   THA Hip resurfacing
Observation Predictive value Joint fluid Chrome AUC Joint fluid Cobalt AUC Joint fluid Chrome AUC Joint fluid Cobalt AUC
Lymphocyte cuff thickness >0 mm .549 .476 .817 .871a
  >0.25 mm .538 .623 n/a n/a
Histiocyte cuff thickness >0 mm .586 .467 n/a n/a
≥1 mm .523 .606 .736 .687
Surface necrosis Grade II-IV .551 .688 .709 .829a
  Grade III-IV .529 .621 .820 .807
  Grade IV .638 .582 .85 .95
Particle load Grade 1–4 .536 .618 .638 .895a
  Grade 2–4 .492 .571 .552 .625
  Grade 3–4 .480 .489 .495 .551
  Grade 4 .496 .504 .588 .677
  1. n/a assessment of AUC not possible due to inadequate number of controls and cases, see Table 1. a = significantly different from AUC = .5, see Figs. 2 and 3