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The Oswestry Disability Index and 12-Item Short Form Health Survey Physical Component Scores Are Not Affected by
Justin Tiao1, Ashley M Rosenberg, Dennis M Bienstock
1From the Department of Orthopaedic Surgery, Icahn School of Medicine at Mount Sinai, New York, NY (Mr. Tiao, Ms. Rosenberg, Dr. Bienstock, Ms. Sacks, Dr. Laurore, Dr. Herrera, Dr. Bronson, Dr. Chaudhary, Dr. Iatridis, and Dr. Hecht); the Department of Orthopaedic Surgery, University of Washington, Seattle, WA (Dr. Shankar); and the Department of Anesthesiology, Hospital for Special Surgery, New York, NY (Dr. Poeran).
Objective:
To assess the effects of recall bias on prospectively collected patient-reported outcome (PRO) measures after lumbar laminectomy by analyzing correlations between PROs and step counts in measurement windows preceding PRO measurement.
Methods:
Responses to the 12-item Short Form Health Survey (SF-12) and the Oswestry Disability Index (ODI) were collected postoperatively from 22 patients. Accelerometers recorded daily step counts. Median and maximum step counts were calculated for windows (1 day, 3 days, 1 week, and 2 weeks) preceding PRO measurement. Spearman rank correlation coefficients between PROs and step counts were calculated.
Results:
Median and maximum step counts from 1- and 2-week windows more consistently correlated with SF-12 Physical Component Scores scores than 1- and 3-day windows over the postoperative period. Median steps from 1-, 2-week, and 3-day windows correlated more with ODI scores than the 1-day window. Maximum steps from 1- and 2-week windows correlated more than 1- and 3-day windows.
Discussion:
PROs had higher concordance with step counts from the 1 week and 2 weeks before PRO measurement than the 1 day and 3 days prior. We therefore conclude that SF-12 and ODI are not markedly affected by recall bias because scores are not skewed by the events of the days immediately preceding measurement.
