Table 3.

Inter-rater correlation of CDR and DDR sum of ranks scores by dementia diagnosis

	Clinical Dementia Rating, CDR			Dementia Disability Rating, DDR
	DAT	FTD	CDNOS	DAT	FTD	CDNOS
Rater 1 v Rater 2	0.85	0.94	0.37*	0.88	0.89	0.85
Rater 1 v Rater 3	0.88	0.96	0.84	0.97	0.96	0.90
Rater 2 v Rater 3	0.90	0.96	0.80	0.91	0.92	0.97

Inter-rater comparisons are based on Spearman’s correlation coefficient.

^*p=0.409; p<0.05 for all other comparisons.