Table 4

Cause-specific mortality among subjects with and without rheumatoid arthritis, Iowa Women’s Health Study, 1986–2000. Results are shown as No (% of total at risk)

Cause of death*Patients† (n=156)Non-patients (n=31056)Relative risk‡ (95% CI)
*Infections include conditions with ICD-9 (or ICD-10 equivalent) codes of 001–139, 320–322, 480–487. Malignant neoplasms include ICD-9 codes 140–208, while diseases of the circulatory system include ICD-9 codes 390–459.
†Subjects were excluded from the analysis if data for ICD-9 code were missing (two patients and 122 non-patients).
‡Calculated using Cox proportional hazards regression (multivariable adjustments for comorbidity, education, smoking history, alcohol use, body mass index, and daily decaffeinated coffee consumption).
Infection2 (1)106 (0.3)3.61 (0.89 to 14.69)
Diseases of the circulatory system9 (6)1254 (4.0)1.46 (0.76 to 2.81)
Malignant neoplasm8 (5)1380 (4.4)0.97 (0.46 to 2.04)
Other9 (6)784 (2.5)