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The initial analysis was based on data from the recruitment questionnaire array for 3,132 subjects.
Alongside the ODI, the questionnaire array included the EQ-5D health-related quality of life instrument [ 21].
Patients were then provided with further multiple copies of the questionnaires and were instructed to complete the same questionnaire array every week over the 12 weeks following each injection.
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In principle, therefore, each participant could complete 26 questionnaire arrays, in the form of two sequences of 13.
To assess the stability of any relationship, we modelled changes in the EQ VAS score over the 12 months between the two questionnaire arrays using, as independent variables, changes in the EQ-5D and in the HADS classifications, plus the socio-demographic variables.
Regarding barriers and opportunities, the questionnaire offered an array of answers identified in previous studies.
The "Information used" and "Information would have used" questionnaires listed an array of relevant biopsychosocial factors, but it was not an exhaustive list of all possible factors that could influence chronic pain treatment decisions.
The questionnaire touches upon an array of subjects: lawyers in the case want to know who is a professional baseball fan and the number of games those people attended in the past five years and whether they or immediate family members ever participated in or coached an organized sport.
The questionnaire covered a vast array of direct medical cost elements associated with the treatment of LBP (see Table 1), such as visits to the general practitioner and specialists, different types of therapy, pain medication, surgery, inpatient hospital stays, and expenditure for utility devices and physical training connected with the treatment and prevention of LBP.
A vast array of questionnaires has been used to measure HRQoL in diabetes patients, contributing to the difficulty of selecting instruments for future research.
The majority of subjects in both arms completed a further array of questionnaires at 12 months after recruitment.
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