Table 2. Observational studies of zygosity and concordance for rheumatic fever.
Study ID | No of twin pairs | Type of zygosity | Occurrence of acute rheumatic fever | |
Concordance | Disconcordance | |||
Irvine-Jones 1933 [24] | 7 | MZ | 2 | 0 |
DZ | 0 | 5 | ||
Wilson 1937 [25] | 6 | MZ | 2 | 0 |
DZ | 2 | 2 | ||
Kaufmann 1938 [21] | 72 | MZ | 5 | 22 |
DZ | 1 | 44 | ||
Stevenson 1953 [23] | 10 | MZ | 1 | 0 |
DZ | 0 | 9 | ||
Taranta 1959 [26] | 56 | MZ | 3 | 13 |
DZ | 1 | 39 | ||
Reed 1964 [22] | 284 | MZ | 36 | 91 |
DZ | 11 | 146 | ||
Totals | 435 | MZ | 49 | 126 |
DZ | 15 | 245 |
No, number; MZ, monozygotic; DZ, dizygotic.