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Table 1 Baseline characteristics of 8200 study subjects based on evidence of AVN by MRI

From: Administrative Algorithms to identify Avascular necrosis of bone among patients undergoing upper or lower extremity magnetic resonance imaging: a validation study

  AVN Cases (evidence of AVN on MRI) n = 83 Non-Cases (without AVN on MRI) n = 8117
Mean age ± SD 50.4 ± 15.1 52.4 ± 15.4
Females, n (%) 50 (60.2) 4541 (55.9)
Race, n %
 White 57 (68.7) 5975 (73.6)
 Black 13 (15.7) 542 (6.7)
 Hispanic 4 (4.8) 458 (5.6)
 Asian 4 (4.8) 145 (1.8)
 Other 0 (0) 64 (0.8)
 Not Recorded 5 (6.0) 933 (11.5)
Co-morbiditiesa, n (%)
 Rheumatoid Arthritis 5 (6.0) 205 (2.5)
 Osteoarthritis 35 (42.2) 2410 (29.7)
 Systemic Lupus Erythematosus 8 (9.6) 29 (0.4)
 HIV 0 (0) 16 (0.2)
  1. aDefined as ≥1 ICD-9 code within the 18-month study period using the following codes: Rheumatoid Arthritis (ICD-9714.0), Osteoarthritis (ICD-9715.X), Systemic Lupus Erythematosus (ICD-9710.0), HIV (ICD-9042).