Dermatomyositis and polymyositis in total hip arthroplasty

Table 1 Demographic factors for patients included in this study

	No. of IIM patients	No. of control patients	P value
Total number of patients	545	545
Female patients	74.90%	74.90%	1.000
Age (yr)
≤ 64	24.4%	23.6%
65-69	25.0%	24.1%
70-74	19.1%	19.7%	0.993
75-79	17.1%	18.1%
80-84	11.4%	11.2%
≥ 85	3.1%	3.4%
Region
Midwest	23.1%	26.8%
Northeast	18.5%	21.5%	0.1851
South	41.3%	36.9%
West	17.1%	14.9%

Reported percentages reflect the proportion of total patients in each of the two sample populations (e.g., patients with idiopathic inflammatory myopathies or controls). IIM: Idiopathic inflammatory myopathies.