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            Outcome measures of questionnaires and number of questions in each instrument
          
Outcome MeasuresNumber of Questions
NRS1
Pain Medication questionnaire2
Modified Roland Scale23
SOF ADL6
Euro QOL5
Pain frequency index1
Pain bothersomeness index1
SF-36 Version 136
OPAQ—Body image domain3
Pain impact on activities2
Back pain resource use2
Total number of questions82
  • Note:—NRS indicates numeric rating scale; SOF ADL, Study of Osteoporotic Fractures and Activities of Daily Living questionnaire; Euro QOL, Euro Quality of Life; SF-36, Short-Form Health Survey with 36 questions; OPAQ, Osteoporosis Assessment Questionnaire.