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. 2016 Sep;16(9):1042-6.
doi: 10.1016/j.spinee.2016.03.022. Epub 2016 Mar 17.

Reliability of the revised Scoliosis Research Society-22 and Oswestry Disability Index (ODI) questionnaires in adult spinal deformity when administered by telephone

Steven L Bokshan  1 , Jakub Godzik  2 , Jonathan Dalton  1 , Jennifer Jaffe  1 , Lawrence G Lenke  3 , Michael P Kelly  4
Affiliations

Reliability of the revised Scoliosis Research Society-22 and Oswestry Disability Index (ODI) questionnaires in adult spinal deformity when administered by telephone

Steven L Bokshan et al. Spine J. 2016 Sep.

Abstract

Background context: The non-response rates are as high as 20% to 50% after 5 years of follow-up in adult spinal deformity (ASD) surgery. Minimizing loss to follow-up is essential to protect the quality of data in long-term studies. Phone and internet administration of outcomes instruments has grown in popularity and has been found to not only provide a convenient way of collecting data, but also show improved response rates.

Purpose: The study aimed to examine the reliability of the revised Scoliosis Research Society-22 (SRS-22r) and the Oswestry Disability Index (ODI) questionnaires in ASD patients when administered by telephone.

Study design/setting: This is a single-center, randomized crossover phone validation of ASD patients.

Patient sample: The study included ASD patients presenting to a tertiary spine care center.

Outcome measures: The outcome measures were ODI and SRS-22r.

Methods: Forty-nine patients (mean age: 55.7 years) with ASD were randomized in a 1:1 ratio to either phone completion of the SRS-22r and ODI followed by in-office completion, or to in-office completion followed by phone completion. An interval of 2 to 4 weeks was placed between administrations of each version. A paired t test was used to assess the difference between the written and phone versions, and intraclass correlation coefficients were used to assess homogeneity. Finally, goodness-of-fit testing was used to assess version preference.

Results: There was no significant difference between the phone and in-office versions of the SRS-22r (p=.174) or the ODI (p=.320). The intraclass correlation coefficients of the SRS-22r and ODI were 0.91 and 0.86, respectively. Completion over the phone was the most popular option (57% preferred phone, 29% preferred in-office, and 14% had no preference).

Conclusions: Phone administration of the SRS-22r and ODI to ASD patients provides a convenient and reliable tool for reducing loss of follow-up data.

Keywords: Adult spinal deformity; Oswestry Disability Index; Outcomes; SRS-22r; Telephone administration.

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References

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