Abstract
Background
The Quick Disability of the Arm, Shoulder, and Hand (QuickDASH) questionnaire is a region-specific, self-administered questionnaire, which consists of a disability/symptom (QuickDASH-DS) scale, and the same two optional modules, the work (DASH-W) and the sport/music (DASH-SM) modules, as the DASH. After the Japanese version of DASH (DASH-JSSH) was cross-culturally adapted and developed, we made the Japanese version of QuickDASH (QuickDASH-JSSH) by extracting 11 out of 30 items of the DASH-JSSH regarding disability/symptoms. The purpose of this study was to test the reliability, validity, and responsiveness of QuickDASH-JSSH.
Methods
A series of 72 patients with upper extremity disorders completed the QuickDASH-JSSH, the 36-Item Short-Form Health Survey (SF-36), and the Visual Analog Scale (VAS) for pain. Thirty-eight of the patients were reassessed for test–retest reliability 1 or 2 weeks later. Reliability was investigated by the reproducibility and internal consistency. To analyze the validity, a principal component analysis and the correlation coefficients between the QuickDASH-JSSH and the SF-36 were obtained. The responsiveness was examined by calculating the standardized response mean (SRM; mean change/SD) and effect size (mean change/SD of baseline value) after carpal tunnel release of the 17 patients with carpal tunnel syndrome.
Results
Cronbach’s alpha coefficient in the QuickDASH-DS was 0.88. The intraclass correlation coefficient (ICC) for the same was 0.82. The unidimensionality of the QuickDASH-DS was confirmed. The correlation coefficients between the QuickDASH-DS and the DASH-DS, DASH-W, or the DASH-SM were 0.92, 0.81, or 0.76, respectively. The correlation coefficients between the QuickDASH-DS score and the subscales of the SF-36 ranged from −0.29 to −0.73. The correlation coefficient between the QuickDASH-DS score and the VAS for pain was 0.52. The SRM/effect size of QuickDASH-DS was −0.54/−0.37, which indicated moderate sensitivity.
Conclusion
The Japanese version of QuickDASH has equivalent evaluation capacities to the original QuickDASH.
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Introduction
Health measurement scales are important patient outcome tools to measure health status and evaluate medical intervention.1 Recently several measures for the evaluation of upper extremity function have been developed.2–7 Most of them are joint-specific2,3 or diseasespecific.4,5 Others are intended to evaluate the function of the entire upper extremity using a region-specific measure.6,7 The Disability of the Arm, Shoulder, and Hand (DASH) questionnaire was devised as a regionspecific measure by the American Academy of Orthopaedic Surgeons (AAOS) in collaboration with a number of other organizations.7 The rationale for use of this measure is that the upper extremity is a functional unit or kinetic chain.8 Therefore, the DASH is suitable for measuring health status outcome because it is mainly a measure of disability. The DASH is now available in several languages and in use in several countries.9–16 Studies of reliability and validity have been published for not only the original version,17 but also for the Japanese9 and other language versions.10–16
The QuickDASH was developed as a shortened version of the DASH Outcome Measure.18 Instead of the 30 items of the DASH Outcome Measure, the QuickDASH uses 11 items to measure physical function and symptoms in people with any or multiple musculoskeletal disorders of the upper limb. Like the DASH Outcome Measure, the QuickDASH also has two optional modules intended to measure symptoms and function in athletes, performing artists, and other workers whose jobs require a high degree of physical performance.
We, the Impairment Evaluation Committee (Japanese Society for Surgery of the Hand), have completed cross-cultural adaptation and development of the DASH Japanese version (DASH-JSSH) and reported its reliability, validity, and responsiveness.9 After the QuickDASH was released, we also developed the QuickDASH Japanese version (QuickDASH-JSSH). The purpose of this study was to test the reliability, validity, and responsiveness of the QuickDASH-JSSH, to compare them with those of the full DASH-JSSH, and to make the QuickDASH-JSSH available for use in Japan.
Materials and methods
In accordance with published guidelines,19,20 we organized the DASH-JSSH committee consisting of translators, researchers, a methodologist, and a Japanese language expert, and culturally adapted the full DASH (version 2.0) into Japanese.9
After the QuickDASH was released by the AAOS, we, the Impairment Evaluation Committee (Japanese Society for Surgery of the Hand), extracted 11 items from the 30 items of the full DASH and adopted two optional modules of the full DASH to develop the QuickDASH Japanese version (QuickDASH-JSSH). The QuickDASH-JSSH version was then evaluated with regard to reliability, validity, and responsiveness.
The QuickDASH questionnaire
The main part of the QuickDASH is an 11-item disability/ symptom (QuickDASH-DS) scale concerning the patient’s upper extremity.18 Each item has five response choices, ranging from “no difficulty or no symptom” to “unable to perform activity or very severe symptom,” and is scored on a one-to-five scale. The items ask about the severity of each of the symptoms of pain, activityrelated pain, tingling, weakness, and stiffness (two items: numbers 9,10), the degree of difficulty in performing various physical activities because of an arm, shoulder, or hand problem (6 items: numbers 1–6), the effect of the upper extremity problem on social activities, work, and sleep (three items: numbers 7, 8, 11). The psychological effect on self-image (one item: number 30) in the full DASH was excluded in this QuickDASH. These 11 items provide the DASH disability/symptom (DASH-DS) score ranging from zero (no disability) to 100 (the severest disability), after summation of the scores from all items and transformation.
The QuickDASH, as does the full DASH, contains two optional modules concerning the ability to work, and the ability to perform sports and/or to play musical instruments. These two optional modules each consist of four items, each of which has a one-to-five scale. These provide the DASH work (DASH-W) score and the DASH sport/music (DASH-SM) score ranging from zero (no disability) to 100 (the severest disability), after summation of the scores from all items and transformation.
Patients and setting
A series of 73 patients with upper extremity disorders was seen on an outpatient basis in five orthopedic surgery departments in Japan.9 Exclusion criteria were age below 18 years, and relevant comorbidity (e.g., connective tissue disease). One patient with comorbidity of systemic lupus erythematosus (SLE) was excluded. The study was conducted on a total of 72 patients (17 men, 55 women) with carpal tunnel syndrome (38 patients), rotator cuff disease (10 patients), cubital tunnel syndrome (7 patients), thoracic outlet syndrome (4 patients), or others (13 patients). The mean age was 54.1 years (SD 14.9 years, range 20–81 years). After informed consent was obtained from the patients to participate in this study, they answered the DASH-JSSH questionnaire, the official Japanese version of the 36-Item Short-Form Health Survey (SF-36; version 1.2),21,22 and the Visual Analog Scale (VAS) [0–10 scale] for pain. The data collected from the 72 patients were used as a baseline value. Among the 72 patients, the 38 who had no treatment such as medication and rehabilitation during the consecutive visits were readministered the DASH-JSSH questionnaire and VAS for pain 1 or 2 weeks later. The 17 patients with carpal tunnel syndrome who received carpal tunnel release by three hand surgeons answered the DASH-JSSH questionnaire and VAS for pain twice preoperatively and postoperatively (3 months after surgery). The protocol of this study was reviewed and approved by the institutional review board prior to implementation.
Assessment of reliability, validity, and responsiveness
Reliability was investigated by looking at the reproducibility and internal consistency based on the test-retest method. The following analyses were conducted to examine the validity. A principal component analysis was conducted to examine the construct validity and the unidimensionality of the QuickDASH-JSSH disability/symptom (QuickDASH-JSSH-DS). Completeness of item responses of the QuickDASH-JSSH and VAS for pain was examined. Correlation coefficients between the QuickDASH-JSSH and the SF-36 were obtained, and the following hypotheses were examined to investigate concurrent validity: (1) “physical functioning” (SF-36-PF) or “role-physical” (SF-36-RP) would exhibit the strongest association; (2) “bodily pain” (SF-36-BP) would exhibit the next strongest association; and (3) “mental health” (SF-36-MH) and “vitality” (SF-36-VT) would exhibit the weakest association. Correlation coefficients between the QuickDASH-JSSH-DS and the full DASH-JSSH-DS, the DASH-JSSH-W, or the DASH-JSSH-SM scales were also obtained.
Correlation coefficients between the QuickDASH-JSSH-DS and the SF-36 were obtained. Correlation coefficients between the QuickDASH-JSSH and VAS for pain were obtained, and the criterion-based validity investigation looked at the following hypothesis: the correlation between the QuickDASH-JSSH and VAS for pain would be high. The responsiveness was examined by calculating the standardized response mean (SRM; mean change/SD)23 and effect size (mean change/SD of baseline value)24 after carpal tunnel release of the patients with carpal tunnel syndrome.
Statistical analysis
Kolmogorov-Smirnov and Lilliefors probability tests were used to assess distribution of the QuickDASH-JSSH and ages of the subjects. The interval measurement of QuickDASH-JSSH-DS was not normally distributed. Therefore, correlations between QuickDASH-JSSH-DS and other instrument scales were assessed using a nonparametric test (Spearman’s correlation). Cronbach’s alpha was used to assess internal consistency. Instrument test-retest reliability was assessed with the intraclass correlation coefficient (ICC).
All statistical analyses were conducted using the Statistical Package for Social Science (SPSS) version 12.0 J software. The critical values for significance were set at P < 0.05.
Results
Completeness of item responses
No patients had difficulty completing the DASH-JSSH questionnaire.9 Most of the patients considered all the items of the DASH-JSSH-DS section to be clear. Two out of the 72 patients (nonrespondent group) did not answer one item of the QuickDASH-JSSH-DS. One patient did not respond to item 5. The other patient did not respond to item 7. Fifty-five out of 72 (76%) patients answered the DASH-JSSH-W. However, only 15 out of 72 (21%) patients responded to the DASH-JSSH-SM.9
The mean, median, and standard deviation of the QuickDASH-JSSH scores were 28, 24, and 21, respectively. The numbers of ceiling and floor scores of the QuickDASH-JSSH were identified. One patient had a maximum disability score of 100 (floor) on the QuickDASH-JSSH-DS. Three and four patients had the minimum disability score of zero (ceiling) on the DASH-JSSH-W and the DASH-JSSH-SM, respectively.9
Reliability
Internal consistency was assessed by use of Cronbach’s alpha coefficient. The alpha coefficient for the 11 items in the QuickDASH-JSSH-DS was high (0.88). When the alpha coefficient was calculated for each of the 11 items by eliminating each item, one by one, the range was 0.87–0.88, and no items were found to change the internal consistency substantially.
Instrument test-retest reliability was assessed with the intraclass correlation coefficient (ICC). There were 38 patients for the test-retest reliability, and the period between the first and second tests was a mean of 9.2 days (range 6–17 days). The ICC for the QuickDASH-JSSH-DS was 0.82 (95% confidence interval: 0.69–0.90). All ICCs for the QuickDASH-JSSH indicated sufficient reproducibility.
Validity
A principal component analysis was conducted to confirm the unidimensionality of the QuickDASH-JSSH-DS. The first factor had an eigenvalue (amount of variation in the total sample accounted for by that factor)14 of 5.12, which explained the 47% total variance of the QuickDASH-JSSH-DS scores of the patients (Fig. 1). The unidimensionality was found to be strong as a result of a substantial difference between the first and the second factors (eigenvalue 1.74, Fig. 1). When looking at the first factor loading for each item, all items had loading (the correlation with the total score) of 0.4 or higher (Table 1) and communalities of more than 0.4.
The correlation coefficients between the QuickDASH-JSSH-DS and the DASH-JSSH-DS, DASH-JSSH-W, or the DASH-JSSH-SM were 0.92, 0.81, and 0.76, respectively (Table 2, P < 0.01). These results indicate strong correlations between the QuickDASH-JSSH-DS and the DASH-JSSH-DS, between the QuickDASH-JSSH-DS and the DASH-JSSH-W, and between the QuickDASH-JSSH-DS and the DASH-JSSH-SM.
The correlations between the QuickDASH-JSSH-DS score and the subscales of the SF-36 scale ranged from −0.29 to −0.73 (Table 2). The strongest correlation was observed in “role-physical,” followed by “physical functioning” and “bodily pain”. The correlation between QuickDASH-JSSH-DS and “mental health” or “vitality” was somewhat weak. These results support the hypothesis set down in advance, except the strongest correlation (Table 2).
No statistical difference (P = 0.161) in age was found between men (mean [SD], 50 [4.9] years old) and women (mean [SD], 55 [1.8] years old). The QuickDASH-JSSH-DS scores between men (mean score: 21.1) and women (mean score: 30.6) was compared by Mann-Whitney U-test. There was no statistical difference between them (P = 0.09). This result supports our hypothesis. The correlation between the QuickDASH-JSSH-DS score and age was weak (r = 0.280, P < 0.05).
The correlation between the QuickDASH-JSSH-DS score and the degree of pain was examined and observed as moderate for the SF-36 bodily pain score and the VAS for pain (Table 2).
Responsiveness
Seventeen of 38 patients with carpal tunnel syndrome received carpal tunnel release. They completed the QuickDASH-JSSH at 3 months after the surgery. The mean subject age was 57 years (SD: 10 years, range: 48–78 years). There were 16 women and one man. The differences between preoperative and postoperative QuickDASH-JSSH-DS scores were not normally distributed by Kolmogorov-Smirnov and Lilliefors probability tests. Calculated SRM and effect size of QuickDASH-JSSH-DS was −0.54/−0.37. The Wilcoxon matched-pairs signed-ranks test was used to analyze QuickDASH-JSSH-DS over time. There was a statistical difference between the median value of preoperative and postoperative QuickDASH-DS scores (P = 0.028, one-tailed).
Discussion
Japanese adaptation of the DASH questionnaire was performed following a systematic standardized approach.19,20 The purpose of this study was to examine the psychometric qualities of the QuickDASH-JSSH by assessing its psychometric standards in the area of the reliability, validity, and responsiveness.
The QuickDASH-JSSH consists of an 11-item scale and two optional 4-item scale modules. It took patients a similar amount of time to complete the full DASH-JSSH compared with the time to complete the other language versions.11 This may indicate that it will take them a shorter time to complete the QuickDASH questionnaire. In the full DASH, the elderly patients left no more than three items unanswered, and those were thought to pertain to specific activities, such as sexual activities and recreational activities, that those individuals do not perform.9 In the QuickDASH such activities, especially sexual activities from the full DASH, were eliminated. That may explain why all patients except two completed the QuickDASH. We can take advantage of the QuickDASH instead of the full DASH especially in the case of epidemiological studies in the workplace or when measuring the health status of elderly people. The lack of ceiling effects assure the authors of the validity of this version of the QuickDASH-JSSH-DS.
As for measurement precision, recommended reliability standards for individual-level applications range from a low of 0.90 to a high of 0.95, which is the desired standard.25 Most general health status measures (e.g., SF-36, the Nottingham Health Profile [NHP], the Functional status questionnaire [FSQ]),25 as well as lesion- or joint-specific questionnaires (e.g., the Roland-Morris Disability Questionnaire26 and Western Ontario and McMaster Universities osteoarthritis index [WOMAC]27), cannot meet this standard, whether they are designed for individual-patient applications or group-level applications. Most translated DASH versions10,12–15 as well as the original full DASH17 had internal consistency higher than 0.95. Beaton et al. reported that the QuickDASH had internal consistency of 0.94 so that QuickDASH has the potential to work well in the monitoring care of individual patients in clinical settings;18 but the QuickDASH-JSSH had internal consistency of 0.88. We may say that QuickDASH-JSSH could be used with caution for daily assessment of individual patient status. But as is stated in the DASH homepage (http://www.dash.iwh.on.ca/), because the full questionnaire provides greater precision, it may be the best choice for clinicians who wish to monitor arm pain and function in individual patients. We would prefer that the QuickDASH be used for groups of workers or patients.
The validation process of the QuickDASH-JSSH questionnaire has shown that it has a similar validity to the other language versions10,12–16 including the original full DASH.17 The strong correlations between the QuickDASH-JSSH-DS and SF-36 subscales (role of physical health, physical functioning, and bodily pain) support this validity and demonstrate similar results to the validation papers for the other language versions including the original full DASH. These results demonstrated that the QuickDASH-JSSH measures the important elements that make up health-related quality of life (QOL).
The QuickDASH-JSSH-DS scale exhibited high unidimensionality and there was no low item-scale correlation. The communalities of this scale were very high. These results show that the QuickDASH-JSSH-DS has a high quality of validation.
Cohen’s rule-of -thumb for interpreting the “effect size index,” i.e., a value of 0.2 is small, 0.5 is moderate, and 0.8 or greater is large, can be applied to the SRM.23 The responsiveness of the QuickDASH-JSSH-DS for patients with carpal tunnel syndrome was moderate 3 months after carpal tunnel release operation, although other studies showed higher responsiveness of DASHDS than our results.28 There was a statistical difference between the mean value of preoperative and postoperative QuickDASH-JSSH-DS scores.
We believe the strengths of this study are that the QuickDASH-JSSH-DS scale demonstrated good reproducibility, consistency, and validity. Moreover, it had a moderate responsiveness.
A limitation of this study is that we cannot successfully demonstrate the responsiveness of QuickDASH because the sample size was relatively small and the patients’ response rate was low. Moreover, the samples of this study are not representative of the general population.
Conclusions
We can conclude that the Japanese version of the QuickDASH has equivalent evaluation capacities to the original QuickDASH. We expect that the use of this scale in Japan to assess treatment by the patients themselves will contribute to meaningful improvement of outcome for patients with upper extremity disorders. Above all, the QuickDASH could be used for groups of patients.
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Imaeda, T., Toh, S., Wada, T. et al. Validation of the Japanese Society for Surgery of the Hand Version of the Quick Disability of the Arm, Shoulder, and Hand (QuickDASH-JSSH) questionnaire. J Orthop Sci 11, 248–253 (2006). https://doi.org/10.1007/s00776-006-1013-1
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DOI: https://doi.org/10.1007/s00776-006-1013-1