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Table 2 Distribution of both primary and secondary diagnoses within 14 ICD-9-CM diagnostic categories for hospitalized individuals who served in the 1991 Gulf War and remained on active duty, FY 1995–2004

From: The long-term hospitalization experience following military service in the 1991 Gulf War among veterans remaining on active duty, 1994–2004

  All years FY 1995–1997 FY 1998–2000 FY 2001–2003 FY 2004
  n = 43 346 n = 30 629 n = 10 588 n = 7572 n = 1937
Diagnostic categories* % % % % %
Infectious and Parasitic Diseases (001–139) 7.0 5.5 6.4 6.3 6.7
Neoplasms (140–239) 7.5 6.2 6.2 7.9 8.8
Endocrine, Nutritional and Metabolic Diseases, and Immunity Disorders (240–279) 10.4 5.8 9.4 14.7 16.9
Diseases of the Blood and Blood-Forming Organs (280–289) 5.4 3.3 5.9 6.2 5.3
Mental Disorders (290–319) 13.8 10.4 13.3 14.0 14.8
Diseases of the Nervous System and Sense Organs (320–389) 7.5 6.8 5.3 5.4 5.8
Diseases of the Circulatory System (390–459) 14.7 9.4 14.3 20.8 25.1
Diseases of the Respiratory System (460–519) 12.2 11.0 9.3 9.4 9.7
Diseases of the Digestive System (520–579) 23.4 20.1 19.6 22.4 23.4
Diseases of the Genitourinary System (580–629) 11.1 9.5 9.6 10.0 11.5
Diseases of the Skin and Subcutaneous Tissue (680–709) 5.4 4.8 3.8 4.5 4.1
Diseases of the Musculoskeletal System and Connective Tissue (710–739) 32.7 32.1 25.6 26.0 26.1
Symptoms, Signs, and Ill-Defined Conditions (780–799) 18.7 13.0 17.1 23.2 24.2
Injury and Poisoning (800–999) 21.0 16.6 20.8 20.9 19.6
  1. ICD-9-CM: International Classification of Diseases, 9th Revision, Clinical Modification.
  2. FY: Fiscal year (October 1 through September 30).
  3. * Each individual could only be counted once (primary or secondary diagnosis) within a particular diagnostic category, but could be counted in multiple categories.
  4. Percentages do not add to 100% because hospitalization for each individual could be counted in more than one category.