Objective:To determine the minimum clinically-important difference (MCID) in the rehabilitation effect among children with haemophilic knee joint contracture.Methods:The data describing 28 children with an average age of 13.89±3.00 years and haemophilic knee joint contracture who received no less than 10 sessions of physiotherapy in the Department of Rehabilitation Medicine at the Peking Union Medical College Hospital were analyzed. The therapeutic effect of the treatement was quantified in terms of Haemophilia Joint Health Scores (HJHSs) for their knees. The MCID after the therapy was evaluated using the mean change method, multivariate linear regression, receiver operating characteristics, and the distribution-based method.Results:The MCID for the improvement of knee HJHS was 5.13 by the mean change method, 4.31 by multivariate linear regression, 3.50 according to the ROC curve and 1.64 by the distribution-based method. Taking all of them into consideration, 4.31 was found to be an appropriate value.Conclusions:The MCID after physical therapy for the improvement in knee HJHS for a child with haemophilic knee contracture is 4.31. Improvements greater than 4.31 can be considered clinically significant.

Objective:To explore the level of physical activity of Chinese adults with haemophilia and its related factors so as to provide a reference for their comprehensive management.Methods:The daily physical activity of adults with haemophilia was surveyed using the International Physical Activity Questionnaire (IPAQ). A total of 110 questionnaires were eligible for analysis at last. The results were compared with published data from other societies using independent sample t-tests and chi squared tests. Spearman correlation analysis and multivariate logistic regression analysis were applied to explore factors related to the subjects′ physical activity levels.Results:Fully 30.9% of the subjects claimed to maintain a high level of physical activity. This was significantly different from the distribution of physical activity observed in Japan (12.4%), Ireland (50.9%) and the United Kingdom (43.1%). According to the Spearman correlation analysis, the number of joints affected, anxiety, and depression are all significantly related to the level of physical activity among such adults. Multivariate logistic regression analysis showed that depression was an independent factor affecting the patients′ level of physical activities.Conclusion:Chinese and Japanese adults with hemophilia have relatively low levels of physical activity, possibly influenced by depression.