Outcome measures following surgery to the rheumatoid hand

Measurement properties of the Michigan hand outcomes questionnaire: Rasch analysis of responses from a traumatic hand injury population

PURPOSE

This study aimed to use Rasch analysis to test the content, scoring, and measurement properties of the Michigan Hand Outcomes Questionnaire (MHQ).

METHODS

MHQ scores from 196 patients with hand and wrist conditions were collected in an outpatient hand rehabilitation facility. Rasch analysis was conducted to assess the fit statistics of MHQ to confirm the scaling structure of disability subscales, and to identify differential item functioning.

RESULTS

The MHQ did not fit with the Rasch model (χ² = 2376.78, df = 74, p < 0.001), and most thresholds of item responses were disordered. The original scoring algorithm derived from 5-point Likert response options was adjusted to 3-point Likert (10 items) and 4-point Likert (11 items) based on the visual inspection of the thresholds map. Differential item functioning was present in the revised scale based on the age, sex, and dominant hand. Only 3 revised subscales of the MHQ including activities daily living (one hand), aesthetics, and satisfaction showed acceptable fit to the Rasch model. Unidimensionality was achieved in all revised subscales.

CONCLUSIONS

The overall MHQ had a substantial misfit from the Rasch model. Despite efforts of item reduction and rescoring, we did not reach a satisfactory solution. This calls into question the validity of the statistical evaluations performed on this scale using the traditional scoring.Implications for rehabilitationThe MHQ was designed to measure different dimensions of pain and disability but demonstrates multiple measurement problems that undermine it use in present form.It is not appropriate to sum all 37 items of the MHQ into a single score.Three subscales of activities daily living (one hand), aesthetics, and satisfaction can provide unidimensional subscales scores with interval level scaling if scored with our proposed Rasch-based revised scoring.The 27-item version of the MHQ is shown to have strong psychometric properties for administration with patients with hand injuries; however, it requires further validation.

The Michigan hand outcomes questionnaire after 15 years of field trial

BACKGROUND

The Michigan Hand Outcomes Questionnaire has been used to assess a variety of hand and upper extremity injuries and conditions for nearly 15 years. It has been included in several overviews of upper extremity outcomes measures, but it has not been systematically examined regarding its clinometric properties during field trials.

METHODS

The authors conducted a review of the Michigan Hand Outcomes Questionnaire in the English language literature from 1998 through March of 2012. Data from clinical studies were abstracted and compiled.

RESULTS

The Michigan Hand Outcomes Questionnaire has been used in 58 clinical studies, and its clinometric properties have been analyzed in an additional 18 publications. The Michigan Hand Outcomes Questionnaire compares favorably with other hand outcomes instruments in the areas of test-retest reliability, validity, and responsiveness. High internal consistency may indicate redundancy within the items in the Michigan Hand Outcomes Questionnaire. The strength of the Michigan Hand Outcomes Questionnaire is its multidimensional construct in measuring patient-rated outcomes in symptom, function, aesthetics, and satisfaction.

CONCLUSIONS

The Michigan Hand Outcomes Questionnaire has been applied across a variety of conditions affecting the hand and upper limb. Its psychometric properties have been tested through field trials in various clinical settings around the world.