Table II.

Rates of mortality caused by infection and myositis in idiopathic inflammatory myopathy patients, reported by year.

	Cases
Cause of mortality	2001–2003	2004–2006	2007–2009	2010–2012	2013–2015	Subtotal	χ2	P-value
Infection-associated	3 (4.4)	3 (3.1)	5 (4.2)	9 (6.0)	14 (5.8)a	34 (5.0)	1.053	0.305
Myositis-associated	3 (4.4)	4 (4.1)	3 (2.5)	2 (1.3)	3 (1.2)	15 (2.2)	4.339	0.037
Subtotal	6 (8.8)	7 (7.1)	8 (6.8)	11 (7.3)	17 (7.1)	49 (7.2)	0.101	0.750
Total hospitalizations	68	98	118	151	241	676

Data are presented as n (% of total hospitalizations) or n.

^aP<0.05, infection-associated mortality increased, but myositis-associated mortality did not (χ²=4.755).