Convergent validity was tested by Sharrack and Hughes (1999), who examined for a relationship of the GNDS with similar measures.
The investigators stated that each item of the GNDS loaded on one factor only.
Sharrack and Hughes (1999) reported an internal consistency for the GNDS as 0.
The psychometric properties of the Americanized version of the GNDS are unknown.
Does the Americanized version of the GNDS have the same four-factor structure as reported in the psychometric testing of the original GNDS?
Is the Americanized version of the GNDS a reliable measure when examined with a 2-week retest?
Is the Americanized version of the GNDS sensitive to changes in neurological disability in MS over time?
The possible range of scores on the GNDS is 0 (no disability) to 60 (maximum possible disability).
The Americanized version of the GNDS includes some modifications to the wording of questions on the GNDS to reflect vocabulary and phrases used in the United States, as well as some refinement and clarification of the instrument.
Two additional questions were included to evaluate the sensitivity of the Americanized version of the GNDS.
Two weeks later participants received another copy of the Americanized version of the GNDS to complete and return for test-retest reliability.