Table 2.
Primary Causes of Death in 1943–2001 for Same-Sex Twins of Known Zygosity Who Died From Infectious Diseases, According to 3 Different Definitions of Infectious Diseasesa,b
| Primary Cause of Death | Narrow | Broader | Broadest |
| Tuberculosis | 52 | 52 | 52 |
| Infectious diseases (excluding tuberculosis) | 92 | 88 | 88 |
| Malignant neoplasms | 0 | 490 | |
| Apoplexia, dementia, senility | 0 | 292 | |
| Diseases of the heart | 33 | 383 | |
| Diseases of the respiratory system | 423 | 530 | |
| Diseases of the digestive system | 56 | 138 | |
| Diseases of the genital-urinary system | 91 | 110 | |
| Congenital malformations | 0 | 4 | |
| Disorders occurring during the perinatal period | 0 | 1 | |
| Violent death (accidents, homicide, suicide) | 0 | 63 | |
| All other diseases | 33 | 186 | |
| Total | 144 | 776 | 2,337 |
a
Four cases of sarcoidosis Boeck (International Classification of Diseases, Eighth Revision, code 135) are included in the narrow definition but not in the broader and broadest definitions.
b
The definitions are categorized as described in the Materials and Methods section of the text and in the Web Appendix, which is posted on the Journal’s website (http://aje.oupjournals.org/).