Background
The Michigan Hand Outcomes Questionnaire (MHQ) has been widely used for nearly twenty years to assess patients with a variety of hand and upper extremity conditions. However, normative data for this assessment has not previously been collected, limiting interpretation.
Methods
The MHQ was administered to 579 participants recruited from the general population. In addition to the six score domains of the MHQ, participants were asked to identify any problem affecting their hand(s), including trauma, hand disease/condition, systemic illness, or nonspecific symptoms. In addition, we collected comorbidities and demographic data for each respondent.
Results
Total MHQ score for healthy individuals was indicative of generally good hand function (95.2, 95% CI 94.3–96.1). Individuals with unilateral trauma had total MHQ score for their affected hand (90.3, 95% CI 87.9–92.6) that was lower than the score for their healthy hand (mean difference 5.7, 95% CI 3.2–8.3). For individuals with and without hand trauma, total MHQ score decreased with increasing number of comorbidities. Many of the differences in MHQ score between the problem hand and unaffected hand were smaller than the minimal clinically important difference (MCID) of 3.0 to 23.0 for known pathologies of the hand and upper extremity.
Conclusion
These normative data provide appropriate baseline information for individuals with and without underlying hand conditions. Most notably, our findings suggest that individuals with a unilateral problem establish new sub-normative values for both their affected and unaffected hand. This data will encourage an appropriate understanding of the results of future studies containing the MHQ.