Table 1 Demographic and clinical data of the three study populations.

	Sporadic inclusion body myositis (n = 21)	Controls (n = 20)	Dermatomyositis and polymyositis (n = 14)	Statistical significance
Demographic data
Male [n (%)]	10 (47.6)	13 (65)	6 (43)	NS
Female [n (%)]	11 (52.3)	7 (35)	8 (57)	NS
Age (years) (mean ± SEM)	67.7 ± 2.3	68.5 ± 1.4	59.3 ± 2.8	NS
Disease progression data
IBMFRS test	23.6 ± 1.66	-	-	-

NS, nonsignificant; SEM, standard error of the mean. The IBMFRS is a disease-specific, 10-point functional rating scale for patients with sIBM. This test classifies the clinical features of sIBM (with a maximum score of 40) according to the impossibility to perform daily activities such as dressing, personal hygiene and swallowing (0 score).

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