Two primary outcome measures were functionality and pain
relief. The Roland Disability Questionnaire
10
(RDQ), an adaptation of the Sickness Impact Profile, was used to measure subjects'
level of functioning when performing daily tasks. Scores can range
from 0 to 24 based on responses to 24 questions to which subjects
answer Yes or No. A score of 14 or more is considered a poor
outcome.
10
This questionnaire has shown reliability, validity and
sensitivity
10,11
and has been used in trials of the treatment of lowback pain