Table 1

Diagnostic categories among control patients

ICD-9^a	Diagnosis	n	%
210–229	Benign neoplasms	56	11.9
240–279	Endocrine, metabolic, and immunity disorders	7	1.5
280–289	Diseases of the blood and blood-forming organs	10	2.1
345	Epilepsy	1	0.2
363–374	Disorders of the eye and adnexa	4	0.9
382–388	Diseases of the ear and mastoid process	2	0.4
454	Varicose veins of lower extremities	1	0.2
486	Pneumonia (organism unspecified)	3	0.6
523–529	Diseases of oral cavity, salivary glands, and jaws	26	5.6
550–551	Hernia of abdominal cavity	3	0.6
555–558	Noninfectious enteritis and colitis	2	0.4
562–569	Other diseases of intestines and peritoneum	2	0.4
592–599	Other diseases of the urinary system	9	1.9
600–608	Diseases of male genital organs	53	11.3
610–611	Disorders of breast	36	7.7
614–616	Inflammatory disease of female pelvic organs	3	0.6
617–627	Other disorders of female genital tract	8	1.7
682–709	Diseases of the skin and subcutaneous tissue	44	9.4
713–719	Arthropathies and related disorders	6	1.3
721–724	Dorsopathies	6	1.3
726–729	Rheumatism (excluding the back)	2	0.4
730–739	Osteopathies, chondropathies, and acquired musculoskeletal deformities	10	2.1
752–759	Congenital anomalies	2	0.4
777	Perinatal disorders of digestive system	18	3.8
782–789	Symptoms of ill-defined conditions	7	1.5
799	Other ill-defined and unknown causes of morbidity and mortality	140	29.9
802–872	Injury	4	0.9
927–959	Late effects of injuries, poisonings, toxic effects, and other external causes	4	0.9