Face validity and test-retest reliability of Persian Version of Baecke Physical Activity Questionnaire in patients with Low Back Pain

Many people suffer from chronic nonspecific low back pain among other musculoskeletal disorders during their life time. There is a close relationship between low back pain and one’s physical activity type. Therefore, it is important to have a satisfactory measurement tool to identify and measure the type and rate of physical activity and give some information about type and rate of physical activity to patients and therapists. The aim of this research was to investigate the face validity and test-retest reliability of Persian translation of "Baeck physical activity questionnaire" in patients with chronic nonspecific low back pain.
Baeck Physical Activity Questionnaire was translated to Persian in accordance with the standards set by the International Quality of Life Assessment (IQOLA) translation protocol with the help of an expert panel. Face validity of the final translation was investigated by both qualitative and quantitative methods. Pearson’s correlation and ICC were used to measure the test retest reliability of the test.
Experts’ opinions were sought as to the wording and clarity of each statement in the instrument. In addition, the opinions of the target population (N=20) was asked as to the face validity of each item. A reliability of 0.85 calculated through ICC and 0.90 calculated through Pearson Correlation Coefficient confirmed the test-retest reliability of the instrument.
Persian translation of Baeck Physical Activity Questionnaire enjoys an acceptable face validity and test-retest reliability in patients with Low Back Pain.