Table 1.

Results of intra- and inter-observer correlations

Intra-observer r values	Observer 1	Observer 2	Observer 3	Observer 4
	0.96	0.95	0.93	0.86*
Inter-observer r values	Obs 1 vs. Obs 2	Obs 1 vs. Obs 3	Obs 1 vs. Obs 4
	0.73	0.71	0.53*
	Obs 2 vs. Obs 3	Obs 2 vs. Obs 4	Obs 3 vs. Obs 4
	0.68	0.33*†	0.32*†

Observer 4 was removed from the study because of his relatively low intra-observer and inter-observer correlations during the training phase. Obs, observer.

^†Non-significant (P > 0.05) correlations. All other correlations are significant (P < 0.01).