Table 1.

Concordance between subjective and objective assessments of AD severity by AD cohort

AD cohorta	Notes, n	Concordant assessments, n (%)	Discordant assessments, n (%)
		S = O	S < O	S > O
Mild	3415	1846 (54.1%)	1410 (41.3%)	159 (4.7%)
Moderate	1914	992 (51.8%)	523 (27.3%)	399 (20.8%)
Severe	2185	1158 (53.0%)	0 (0%)	1027 (47.0%)
All AD cohorts combined	7514	3966 (52.8%)	1933 (25.7%)	1586 (21.1%)

^aBased on clinical assessment of AD stage

AD Alzheimer’s disease

S = O, subjective and objective severity assessments agreed

S < O, subjective assessment was less severe than objective assessment

S > O, subjective assessment was more severe than objective assessment

Chi-square P < 0.0001 for all comparisons