Test-Retest Reliability (Intraclass Correlation Coefficients [ICC (2,1)]), Standard Error of Measurement (SEM), Standard Error of Repeated Measurement (SEMrepeat), and Minimum Detectable Change (MDC) for Subjects Classified as “Unchanged” and Subjects Self-Rated as “About the Same”a
| Questionnaire | Subjects Classified as “Unchanged” (n=47) | Subjects Self-Rated as “About the Same” (n=16) | ||||||
|---|---|---|---|---|---|---|---|---|
| ICC 95% CI) | SEM (95% CI) | SEMrepeat (95% CI) | MDC (95% CI) | ICC (95% CI) | SEM (95% CI) | SEMrepeat (95% CI) | MDC (95% CI) | |
| Oswestry Disability Questionnaire8,9 | 84(.73–.91) | 6(5–8) | 9(7–12) | 15(11–19) | .92(.79–.97) | 4.5(3–7) | 6(4–10) | 10.5(6–17) |
| Quebec Back Pain Disability Scale10 | 84(.73–.91) | 8(6–10) | 11(8.5–15) | 19(14–24) | .89(.72–.96) | 7(4–11) | 9(6–15) | 15(9–24) |
| Roland-Morris Disability Questionnaire11 | 53(.29–.71) | 3.7(2.9–4.6) | 5.2(4.1–6.4) | 8.6(6.7–10.6) | .42(−.07–.75) | 4.1(2.7–5.6) | 5.8(3.8–7.9) | 9.5(6.3–13) |
| Waddell Disability Index12 | 74(.58–.85) | 1.2(0.9–1.5) | 1.7(1.3–2.2) | 2.8(2.1–3.5) | .79(.51–.92) | 1.1(0.7–1.6) | 1.5(0.9–2.3) | 2.5(1.5–3.8) |
| SF-36 Physical Functioning scale | 83(−71–.90) | 10(7–13) | 14(10.5–18) | 22(17–29) | .91(.76–.97) | 7(4–12) | 10(6–16) | 16(9–27) |
| SF-36 Role Limitations-Physical scale | 39(−11–.61) | 28(23–35) | 40(32–49| | 66(53–80) | .47(−.02–.78) | 27(17–37) | 38(24–52) | 62(40–86) |
| SF-36 Bodily Pain scale | 37(−09–.59) | 18(14–21.5) | 25(20–30) | 41(33–50) | .59(.15–.83) | 14(9–21) | 20(13–20) | 33(22–48) |
| Questionnaire | Subjects Classified as “Unchanged” (n=47) | Subjects Self-Rated as “About the Same” (n=16) | ||||||
|---|---|---|---|---|---|---|---|---|
| ICC 95% CI) | SEM (95% CI) | SEMrepeat (95% CI) | MDC (95% CI) | ICC (95% CI) | SEM (95% CI) | SEMrepeat (95% CI) | MDC (95% CI) | |
| Oswestry Disability Questionnaire8,9 | 84(.73–.91) | 6(5–8) | 9(7–12) | 15(11–19) | .92(.79–.97) | 4.5(3–7) | 6(4–10) | 10.5(6–17) |
| Quebec Back Pain Disability Scale10 | 84(.73–.91) | 8(6–10) | 11(8.5–15) | 19(14–24) | .89(.72–.96) | 7(4–11) | 9(6–15) | 15(9–24) |
| Roland-Morris Disability Questionnaire11 | 53(.29–.71) | 3.7(2.9–4.6) | 5.2(4.1–6.4) | 8.6(6.7–10.6) | .42(−.07–.75) | 4.1(2.7–5.6) | 5.8(3.8–7.9) | 9.5(6.3–13) |
| Waddell Disability Index12 | 74(.58–.85) | 1.2(0.9–1.5) | 1.7(1.3–2.2) | 2.8(2.1–3.5) | .79(.51–.92) | 1.1(0.7–1.6) | 1.5(0.9–2.3) | 2.5(1.5–3.8) |
| SF-36 Physical Functioning scale | 83(−71–.90) | 10(7–13) | 14(10.5–18) | 22(17–29) | .91(.76–.97) | 7(4–12) | 10(6–16) | 16(9–27) |
| SF-36 Role Limitations-Physical scale | 39(−11–.61) | 28(23–35) | 40(32–49| | 66(53–80) | .47(−.02–.78) | 27(17–37) | 38(24–52) | 62(40–86) |
| SF-36 Bodily Pain scale | 37(−09–.59) | 18(14–21.5) | 25(20–30) | 41(33–50) | .59(.15–.83) | 14(9–21) | 20(13–20) | 33(22–48) |
SF-36=Medical Outcomes Study 36-Item Short-Form Health Survey.13,14 SEM=SD √(1-R), where SD is the average standard deviation for pretest and posttest for 106 subjects and R is the ICC (2,1). The MDC is expressed in the same scale units as the questionnaires and is the 90% confidence interval of the error associated with repeated measurements.
Test-Retest Reliability (Intraclass Correlation Coefficients [ICC (2,1)]), Standard Error of Measurement (SEM), Standard Error of Repeated Measurement (SEMrepeat), and Minimum Detectable Change (MDC) for Subjects Classified as “Unchanged” and Subjects Self-Rated as “About the Same”a
| Questionnaire | Subjects Classified as “Unchanged” (n=47) | Subjects Self-Rated as “About the Same” (n=16) | ||||||
|---|---|---|---|---|---|---|---|---|
| ICC 95% CI) | SEM (95% CI) | SEMrepeat (95% CI) | MDC (95% CI) | ICC (95% CI) | SEM (95% CI) | SEMrepeat (95% CI) | MDC (95% CI) | |
| Oswestry Disability Questionnaire8,9 | 84(.73–.91) | 6(5–8) | 9(7–12) | 15(11–19) | .92(.79–.97) | 4.5(3–7) | 6(4–10) | 10.5(6–17) |
| Quebec Back Pain Disability Scale10 | 84(.73–.91) | 8(6–10) | 11(8.5–15) | 19(14–24) | .89(.72–.96) | 7(4–11) | 9(6–15) | 15(9–24) |
| Roland-Morris Disability Questionnaire11 | 53(.29–.71) | 3.7(2.9–4.6) | 5.2(4.1–6.4) | 8.6(6.7–10.6) | .42(−.07–.75) | 4.1(2.7–5.6) | 5.8(3.8–7.9) | 9.5(6.3–13) |
| Waddell Disability Index12 | 74(.58–.85) | 1.2(0.9–1.5) | 1.7(1.3–2.2) | 2.8(2.1–3.5) | .79(.51–.92) | 1.1(0.7–1.6) | 1.5(0.9–2.3) | 2.5(1.5–3.8) |
| SF-36 Physical Functioning scale | 83(−71–.90) | 10(7–13) | 14(10.5–18) | 22(17–29) | .91(.76–.97) | 7(4–12) | 10(6–16) | 16(9–27) |
| SF-36 Role Limitations-Physical scale | 39(−11–.61) | 28(23–35) | 40(32–49| | 66(53–80) | .47(−.02–.78) | 27(17–37) | 38(24–52) | 62(40–86) |
| SF-36 Bodily Pain scale | 37(−09–.59) | 18(14–21.5) | 25(20–30) | 41(33–50) | .59(.15–.83) | 14(9–21) | 20(13–20) | 33(22–48) |
| Questionnaire | Subjects Classified as “Unchanged” (n=47) | Subjects Self-Rated as “About the Same” (n=16) | ||||||
|---|---|---|---|---|---|---|---|---|
| ICC 95% CI) | SEM (95% CI) | SEMrepeat (95% CI) | MDC (95% CI) | ICC (95% CI) | SEM (95% CI) | SEMrepeat (95% CI) | MDC (95% CI) | |
| Oswestry Disability Questionnaire8,9 | 84(.73–.91) | 6(5–8) | 9(7–12) | 15(11–19) | .92(.79–.97) | 4.5(3–7) | 6(4–10) | 10.5(6–17) |
| Quebec Back Pain Disability Scale10 | 84(.73–.91) | 8(6–10) | 11(8.5–15) | 19(14–24) | .89(.72–.96) | 7(4–11) | 9(6–15) | 15(9–24) |
| Roland-Morris Disability Questionnaire11 | 53(.29–.71) | 3.7(2.9–4.6) | 5.2(4.1–6.4) | 8.6(6.7–10.6) | .42(−.07–.75) | 4.1(2.7–5.6) | 5.8(3.8–7.9) | 9.5(6.3–13) |
| Waddell Disability Index12 | 74(.58–.85) | 1.2(0.9–1.5) | 1.7(1.3–2.2) | 2.8(2.1–3.5) | .79(.51–.92) | 1.1(0.7–1.6) | 1.5(0.9–2.3) | 2.5(1.5–3.8) |
| SF-36 Physical Functioning scale | 83(−71–.90) | 10(7–13) | 14(10.5–18) | 22(17–29) | .91(.76–.97) | 7(4–12) | 10(6–16) | 16(9–27) |
| SF-36 Role Limitations-Physical scale | 39(−11–.61) | 28(23–35) | 40(32–49| | 66(53–80) | .47(−.02–.78) | 27(17–37) | 38(24–52) | 62(40–86) |
| SF-36 Bodily Pain scale | 37(−09–.59) | 18(14–21.5) | 25(20–30) | 41(33–50) | .59(.15–.83) | 14(9–21) | 20(13–20) | 33(22–48) |
SF-36=Medical Outcomes Study 36-Item Short-Form Health Survey.13,14 SEM=SD √(1-R), where SD is the average standard deviation for pretest and posttest for 106 subjects and R is the ICC (2,1). The MDC is expressed in the same scale units as the questionnaires and is the 90% confidence interval of the error associated with repeated measurements.
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