STUDY DESIGN: Analysis of the prospective AOSpine CSM-International and North America datasets and survey of AO Spine International. OBJECTIVE: This study aims to define the @entity922 ( @entity922 ) of the modified Japanese Orthopaedic Association (mJOA) in @entity1 with @entity179 ( @entity179 ). SUMMARY OF BACKGROUND DATA: The mJOA is the most frequently used clinician-administered tool to assess functional status in @entity1 with @entity179 . By defining its @entity922 , clinicians can better evaluate treatment outcomes for this condition. METHODS: Three methods were used to determine the @entity922 of the mJOA: (1) distribution-based, (2) anchor-based and receiver operating characteristic (ROC) analysis, and (3) professional opinion. Distribution-based methods were used to estimate the @entity922 by computing the half standard deviation and standard error of measurement. Using anchor-based methods, mJOA at 12 months after surgery was compared between @entity1 who were "slightly improved" on the @entity717 ( @entity717 ) and those who were "unchanged." ROC analysis was performed to compute a discrete integer value for the @entity922 that yielded the smallest difference between sensitivity and specificity. We repeated anchor-based methods for @entity1 with mild (mJOA: 15-17), moderate (mJOA: 12-14), and severe disease (mJOA <12). RESULTS: The half standard deviation of the baseline mJOA was 1.36 and the standard error of measurement was 1.21. The difference in mJOA between @entity1 who "slightly improved" on the @entity717 and "unchanged" @entity1 was 1.11. ROC analysis yielded a value of 2 for the @entity922 . The survey of 416 spine professionals confirmed these estimates: the mean response was 1.65  0.66. The @entity922 significantly varied depending on @entity602 severity: ROC analysis yielded a threshold of 1 for mild, 2 for moderate, and 3 for severe @entity1 . CONCLUSION: The @entity922 of the mJOA is estimated to be between 1 and 2 points and varies with @entity602 severity. This knowledge will enable clinicians to identify meaningful functional improvements in @entity179 @entity1 . LEVEL OF EVIDENCE: N/A.

The Minimum Clinically Important Difference of the Modified Japanese Orthopaedic Association Scale in XXXX with @entity179 .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity602 :: ('MESH:D013118', 'Disease') :: ['myelopathy'] @entity179 :: ('MESH:D019636', 'Disease') :: ['DCM', 'degenerative cervical myelopathy'] @entity717 :: ('MESH:D009069', 'Disease') :: ['Neck Disability Index', 'NDI'] @entity922 :: ('MESH:D013568', 'Disease') :: ['minimum clinically important difference', 'MCID']
@entity1 :: (9606,Species) :: ['Patients']
