Table 4. The interobserver agreement in different sets of images.

	Set 1 k	Set 2 k	Set 3 k	Set 4 k	Total k
Experienced group	0.718 (0.631∼0.806)	0.536 (0.449∼0.623)	0.8318 (0.745∼0.919)	0.840 (0.752∼0.927)	0.732 (0.688∼0.776)
Inexperienced group	0.347 (0.298∼0.395)	0.554 (0.506∼0.602)	0.850 (0.801∼0.898)	0.856 (0.807∼0.904)	0.666 (0.642∼0.690)
p	<0.01	0.116	0.120	0.148	<0.01