ABSTRACT
Objective: To develop a weighted disuse risk score rating. Design : Based on specified selection criteria, items of the disuse risk factor were chosen. Then, a conjoint questionnaire for physicians was created using orthogonal cards with ordinal disuse risk grade. Conjoint analysis (SPSS 15.0) was performed, weighting each item and making a formula for calculating the disuse risk score. Setting : The Rehabilitation Department of a University Hospital. Participants : Forty-one physician respondents and 129 consecutive inpatients referred to the rehabilitation department. Main outcome measures : Agreement of the rated disuse risk grade with the calculated disuse risk score, and the reliability of the calculated disuse risk score of the 129 inpatients. Results : Eleven disuse risk factor items were selected ; age, malignant tumor, heart impairment, respiratory impairment, kidney impairment, pain, gait disorder, psychiatric impairment, intellectual disability, dementia, and body mass index. Forty-one physicians completed and returned a postal questionnaire. Cronbach's a of the rated disuse risk grade was 0.948. The correlation coefficient of the average rated disuse risk grade to the calculated disuse risk score was 0.985 (<i>p</i>=0.000). Items of high overall importance (%) were gait disorder (14.0%), malignant tumor (11.5%), and respiratory impairment (11.0%). Those of low overall importance (%) were body mass index (6.8%), kidney impairment (6.6%), and psychiatric impairment (6.1%). For the 129 patients, the calculated disuse risk score of the 11-item was correlated to that of the 9-item weighted disuse risk factor (<i>R</i>=0.930, <i>p</i>=0.000). Conclusions : Both the 11-item disuse risk factor and the weighted disuse risk score rating were considered reliable and useful.