Table 1.

Quality assessment tool proposed by the ADI in 2009 [7]

An overall quality score was derived by summing scores for the following elements:
Sample sizes
<500	0.5 points
500–1499	1 point
1500–2999	1.5 points
≥3000	2 points
Design
Two phase study with no sampling of screen negatives	0 points
Two phase study with sampling of screen negatives but no weighting back	1 point
One phase study or two phase study with appropriate sampling and weighting	2 points
Response proportion
<60%	1 point
60–79%	2 points
≥80%	3 points
Diagnostic assessment
Inclusion of multidomain cognitive test battery, formal disability assessment informatics interview and clinical interview	1 point each