The utility of MRI in predicting radiographic erosions in the metatarsophalangeal joints of the rheumatoid foot: a prospective longitudinal cohort study

Table 2 Summary of secondary endpoints: descriptive statistics

	Bone marrow edema	Defects	Erosions	Synovitis
Patients with this finding at least once during the study, number (percentage)	16 (34.8%)	13 (28.3%)	16 (34.8%)	44 (73.9%)
Joints with this finding at least once during the study, number (percentage)	28 (10.1%)	24 (8.7%)	30 (10.9%)	102 (37%)
Number of times the finding was observed	45	45	70	174
Percentage of time the finding was observed with bone marrow edema	-	26.7%	35.7%	21.8%
Percentage of time the finding was observed with defects	26.7%	-	20%	14.4%
Percentage of time the finding was observed with erosions	60%	31.1%	-	33.9%
Percentage of time the finding was observed with synovitis	91.1%	64.4%	74.1%	-

The 46 patients who completed more than one study are considered here. Two hundred seventy-six joints were imaged by magnetic resonance imaging (MRI) at least twice. A single joint was considered to have the finding if it appeared once in that joint during any of the MRI studies. The total number of times each characteristic was found was also counted, as was the percentage of the time each finding occurred with another. For examples of how these data were calculated, please refer to items (c) and (d) of the Descriptive data section of Materials and methods.

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