Evaluation of The Validity and Reliability of The Questionnaire to Assess The Knowledge, Attitude and Practice of Patients' Postoperative Care of Lumbar Disc or Discectomy

Introduction: Lumbar disc herniation surgery is one of the most common spinal surgeries and postoperative care behaviors play an important role in the healing process. This study aimed to design and psychometric a questionnaire to assess patients' postoperative care of lumbar disc or discectomy. Methods: This is a psychometric study and was conducted in two parts of questionnaire design and its validity and reliability in 2021 in Tehran province. In this study, the tool used was a questionnaire to assess knowledge, attitude and behavior, which was designed using scientific sources, studies and expert opinions. To evaluate the content validity, the content validity ratio and the content validity index were used using the opinions of 10 experts. Test-retest methods were used to evaluate the internal reliability and Cronbach's alpha was used to evaluate the external reliability.  Results: The designed questionnaire contains 38 items that measure 14 items of knowledge, 13 items of attitude and 11 items of practice about patients' caring behaviors after lumbar disc herniation surgery. The content range and content validity index were determined (0.49-1.00) and (0.8-1.00), respectively, and for their impact scores (<1.5), the intra-class correlation range and Alpha Cronbach and Richardson's Kuder coefficient were calculated for the reliability of the three-scale items (0.767-0.977) and (0.75-0.86), respectively. The researcher-made questionnaire was finalized with 38 items and approved. Conclusions: The present study showed that the designed questionnaire has good validity and reliability and can be used to assess the knowledge, attitude and behavior of assessing patients' postoperative care of lumbar disc or discectomy