Dynamic Changes, Cut-Off Points, Sensitivity, and Specificity of Laboratory Data to Differentiate Macrophage Activation Syndrome from Active Disease

Table 1

The characteristics of patients. The quantitative variable (age) was shown as mean ± SD (range). The qualitative variables were shown as number (percentage).

	MAS (n = 17)	Control (n = 53)
Age
Mean ± SD (range)	7.44 ± 4.4 (1–17)	6.6 ± 3.93 (1–17)
Gender
Male	10 (58.8%)	38 (71.7%)
Female	7 (41.2%)	15 (28.3%)
Diagnosis
SJIA	10 (58.8%)	31 (58.3%)
PJIA	4 (23.5%)	12 (22.6%)
Kawasaki	2 (11.8%)	6 (11.3%)
SLE	1 (5.9%)	4 (7.5%)
Presentation
First presentation	9 (52.9%)	31 (58.5%)
On background illness	8 (47.1%)	22 (41.5%)

MAS: Macrophage Activation Syndrome, SD: standard deviation, SJIA: systemic onset juvenile idiopathic arthritis, PJIA: polyarticular juvenile idiopathic arthritis, and SLE: systemic lupus erythematosus.