Abstract: Methods, systems, and apparatus, including medium-encoded computer program products, for creating a cognitive function index. In one aspect, a method includes receiving first information concerning a person, the first information specifying the person's responses, and lack thereof, for components of a cognitive test administered to the person; generating a cognitive function score for the person by comparing the first information with second information concerning a group of people to whom the cognitive test has been administered; converting the cognitive function score to a value in an index comprising a range of values, wherein a first portion of the range corresponds to a cognitively impaired zone, a second portion of the range corresponds to a cognitively normal zone, and a third portion of the range corresponds to a zone of uncertainty defined by a confidence interval centered on a mid-point of the index; and providing the indexed value for the person.

Abstract: Methods, systems, and apparatus, including medium-encoded computer program products, for creating a cognitive function index. In one aspect, a method includes receiving first information concerning a person, the first information specifying the person's responses, and lack thereof, for components of a cognitive test administered to the person; generating a cognitive function score for the person by comparing the first information with second information concerning a group of people to whom the cognitive test has been administered; converting the cognitive function score to a value in an index comprising a range of values, wherein a first portion of the range corresponds to a cognitively impaired zone, a second portion of the range corresponds to a cognitively normal zone, and a third portion of the range corresponds to a zone of uncertainty defined by a confidence interval centered on a mid-point of the index; and providing the indexed value for the person.