Abstract
ABSTRACT
 Purpose: Patient-reported outcomes (PROs) are unique indicators of disease and treatment impact on patients that help in the selection of the correct interventions for their treatment. The aim of our study was to investigate the reliability of PROs that are frequently used in patients with chronic low back pain in face-to-face interview, online, and telephone formats.
 Methods: The participants were randomized into groups until there were at least 120 participants each in the face-to-face interview, online, and telephone groups. All participants completed the Oswestry Disability Index, the Roland–Morris Disability Questionnaire, and the Fremantle Back Awareness Questionnaire according to the format characteristics of their group.
 Results: Among the 364 patients, in the online group (n=120) the completion time for all three questionnaires was significantly shorter than that in the face-to-face interview (n=121) (ODI: p=0.002, RMDQ: p=0.003 and FreBAQ: p=0.032) and telephone (n=123) (ODI: p=0.007, RMDQ: p=0.001 and FreBAQ: p=0.024) groups. When the test–retest reliability was examined, the ODI (ICC: 0.86), RMDQ (ICC: 0.93), and FreBAQ (ICC: 0.81) showed an excellent correlation in the face-to-face interview group. In the telephone group, the ODI, RMDQ, and FreBAQ showed good correlations. In the online group, there was a good correlation in the RMDQ (ICC: 0.74) and FreBAQ (ICC: 0.65), while there was a moderate correlation in the ODI (ICC: 0.59). 
 Conclusion: Although the ODI, RMDQ, and FreBAQ for chronic low back pain patients had lower reliability correlations in both the online and telephone versions compared to the face-to-face interview, mostly they had adequate reliability. Moreover, the online version was a more useful and quicker evaluation method than the telephone version. However, we do not recommend using the online version of the ODI due to its lower reliability.
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