Table 3

Inter-observer variability in classifying the cases

Observed variability of each sound category
Pairs of observersKappaNo murmurInnocent murmurPathological murmur
95% confidence intervals in parentheses.
A v B0.88 (0.72 to 0.92)0.88 (0.76 to 1.00)0.85 (0.74 to 0.96)0.92 (0.68 to 1.00)
A v C0.89 (0.81 to 0.97)0.96 (0.87 to 1.00)0.91 (0.82 to 1.00)0.93 (0.64 to 1.00)
A v D0.78 (0.67 to 0.88)0.92 (0.82 to 1.00)0.81 (0.70 to 0.93)0.85 (0.53 to 1.00)
B v C0.79 (0.68 to 0.89)0.88 (0.74 to 1.00)0.82 (0.70 to 0.93)0.89 (0.47 to 1.00)
B v D0.80 (0.70 to 0.91)0.86 (0.73 to 1.00)0.83 (0.71 to 0.94)0.91 (0.37 to 1.00)
C v D0.77 (0.66 to 0.88)0.92 (0.81 to 1.00)0.81 (0.70 to 0.93)0.85 (0.53 to 1.00)
Mean0.81 (0.77 to 0.85)0.90 (0.86 to 0.95)0.84 (0.79 to 0.88)0.89 (0.76 to 1.00)