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Table 1 Study decision tree

From: Expert agreement confirms that negative changes in hand and foot radiographs are a surrogate for repair in patients with rheumatoid arthritis

Reader judged image A Combined with true sequence of image Ab Conclusion in analysisb
Bettera First time point Progression
Better Second time point Repair
Better and first time point First time point Reader recognized progression
Better and first time point Second time point Reader failed to recognize repair
Better and second time point Second time point Reader recognized repair
Better and second time point First time point Reader failed to recognize progression
  1. The true sequence was unknown to the reader.
  2. aA similar decision tree constructed for a reader judging image A as worse exchanges repair and progression in the conclusion column.
  3. bIn Exercises I and II, when the reader made a judgement as to whether a pair of images represented progression or repair that decision was called direct assignment. In the exercises when the analyst interpreted a reader's combined responses on better/worse and the sequence of images, this is called an inferred or an indirect assignment.