TABLE 2.
Number of Australian Twin Registry participants who agreed to participate in the TEST
| Gender | Age group (years) | Zygosity | Total Pairs Approached | Yes | No | Only 1 Yes | No Reply | % both agreed to participate |
|---|---|---|---|---|---|---|---|---|
| F/F | 5–17 | DZ | 29 | 11 | 8 | 0 | 10 | 38 |
| F/F | 5–17 | MZ | 38 | 17 | 6 | 0 | 15 | 45 |
| F/F | 5–17 | ?Z | 9 | 4 | 1 | 0 | 4 | 44 |
| M/F | 5–17 | DZ | 73 | 26 | 21 | 0 | 26 | 36 |
| M/M | 5–17 | DZ | 35 | 10 | 13 | 0 | 12 | 29 |
| M/M | 5–17 | MZ | 34 | 11 | 12 | 0 | 11 | 32 |
| M/M | 5–17 | ?Z | 10 | 3 | 1 | 0 | 6 | 30 |
| F/F | 18–80 | DZ | 102 | 27 | 33 | 8 | 34 | 26 |
| F/F | 18–80 | MZ | 135 | 49 | 42 | 7 | 37 | 36 |
| M/F | 18–80 | DZ | 114 | 19 | 20 | 18 | 57 | 17 |
| M/M | 18–80 | DZ | 83 | 8 | 19 | 8 | 48 | 10 |
| M/M | 18–80 | MZ | 67 | 14 | 12 | 5 | 36 | 21 |
| Externally recruited twins who were as listed on the ATR: | ||||||||
| - | - | - | 40 | 37 | 3 | 0 | 0 | - |
| Total pairs listed on the ATR: | 686 | 228 | 172 | 38 | 248 | 33 | ||
Abbreviations: F/F: Female/Female; M/M: Male/Male; MF: Male/ Female; DZ: dizygotic pairs; MZ: monozygotic twin pairs; ?Z: Unknown Zygosity; ATR: Australian Twin Registry