| Name of the Instrument/Tool | Childhood Myositis Assessment Scale (CMAS) |
| First Description |
Lovell DJ, Lindsley CB, Rennebohm RM, Ballinger SH, Bowyer SL, Giannini EH, et al, in cooperation with the Juvenile Dermatomyositis Disease Activity Collaborative Study Group. Development of validated disease activity and damage indices for the juvenile idiopathic inflammatory myopathies. II. The Childhood Myositis Assessment Scale (CMAS): a quantitative tool for the evaluation of muscle function. Arthritis Rheum 1999;42:2213–9 |
| Year | 1999 |
| Domains | |
| Concept of constructs | Physical function |
| Population/Disease | Disease specific |
| Originally developed for | Idiopathic Inflammatory Myopathies (IIM) |
| Other rheumatic diseases where can be applied (only if validated) |
--- |
| Additional population with no rheumatic diseases |
No |
| Language: Originally published in | English |
| Available in Language | --- |
| REFERENCE IDENTIFICATION | |
| Author/s | Lovell DJ, Lindsley CB, Rennebohm RM, Ballinger SH, Bowyer SL, Giannini EH, et al, |
| Title | The Childhood Myositis Assessment Scale (CMAS): a quantitative tool for the evaluation of muscle function. |
| Journal | Arthritis Rheum |
| Year | 1999 |
| Vol | 42 |
| Num | --- |
| Pages | 2213 -9 |
| Country | --- |
| Language | --- |
| Other references of interest | |
| Link | https://pubmed.ncbi.nlm.nih.gov/22588740/ |
| Brief Description |
This study summarizes the main outcome measures in adult and juvenile dermatomyositis, polymyositis, and inclusion body myositis. |
| Link | https://pubmed.ncbi.nlm.nih.gov/15146430/ |
| Brief Description |
Validation and clinical significance of the Childhood Myositis Assessment Scale for assessment of muscle function in the juvenile idiopathic inflammatory myopathies |
| Instrument/Tool Translations References | |
| No other References. | |
| DEVELOPER CONTACT INFORMATION | |
| Correspondence to | D Lovell |
| daniel.lovell@cchmc.org | |
| Address | Division of Rheumatology, Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039, USA. |
| Website | --- |
| Available | --- |
| Links | --- |
| DESCRIPTION OF THE INSTRUMENT | |
| Type Of Measure | Questionnaire |
| Brief Description |
The CMAS is an observational performance-based instrument that was developed to evaluate muscle strength, physical function, and endurance in children with juvenile idiopathic inflammatory myopathy (IIM). Items of the CMAS were chosen to explicitly include upper and lower extremity muscle groups, simple and compound movements, and timed items to evaluate endurance. |
| Number of Items | 14 |
| Range | --- |
| Responses options/scale |
Yes Specific scoring options are provided for each item, depending on whether the activity can be performed and how much difficulty is required.The endurance items are categorized into ordinal scale scores |
| Developed for | Both |
| PRACTICAL APPLICATION | |
| Method of administration | Interviewer/assessor |
| Recommendations to score |
Each item of the CMAS is scored depending on whether the activity can be performed and how much difficulty it requires. Scores of individual items range from 0–2 to 0 –6, depending on the item. The CMAS can be easily scored by hand |
| Score Interpretation | The total CMAS score ranges from 0–52, with 52 representing normal or near-normal strength, function, or endurance. |
| Cut-off points | Validated cut points have not been established. However, as part of a consensus process, it was agreed that values <15 represented severe disease |
| Cut-off points applied to | --- |
| Smallest detectable change if described | --- |
| Smallest detectable change applied to | Research, Routine care |
| Completion time by the patient | 20 minutes |
| Scoring time by the assessor | 15/1 minutes |
| Training to score | Not necessary |
| Strengths | Useful in clinical practice & research |
| Limitations | Ceiling effect, Lengthy |
| OTHER COMMENTS | |
| Other Comments | --- |