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Table 2 Agreement between the radiologists (interobserver variability) for the first and second readings (P value < 0.05)

From: The validity of HSG in infertility work up

ObserversaFirst round K value (95% confidence interval)% agreement (n/na)Second round K value (95% confidence interval)% agreement (n/na)
Between observer 1,20.36 (0.31–0.59)62.5 (125/200)0.59 (0.57–0.60)65 (130/200)
Between observer 1,30.38 (0.28–0.49)71 (142/200)0.50 (0.47–0.50)75 (150/200)
Between observer 2,30.56 (0.47–0.59)82.5 (165/200)0.57 (0.55–0.60)90.5 (181/200)
  1. n/na: number of agreed cases/total number of cases
  2. aObserver 1 is the most experienced, and observer 3 is the least experienced