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Table 3 Immediate cause of death and underlying conditions found in 326 RA death certificates by ICD-9 code

From: Mortality in Rheumatoid Arthritis (RA): factors associated with recording RA on death certificates

Condition (ICD-9 code range) Total death certificates listing condition (%)a
Infectious & Parasitic Diseases (001 – 139) 55 (16.9 %)
Neoplasms (140 – 239) 69 (21.2 %)
Diseases of the Circulatory System (390 – 459) 172 (52.7 %)
Diseases of the Respiratory System (460 – 519) 123 (37.8 %)
Diseases of the Musculoskeletal Systemb (710 – 739) 68 (20.9 %)
  1. aPercentages add up to more than 100 % as many patients had more than one underlying condition across several ICD-9 code categories
  2. bTen patients have ICD-9 codes for Diseases of the Musculoskeletal System listed on the death certificate, but do not list RA