James W H
Ann Hum Biol. 1978 Jan;5(1):79-81. doi: 10.1080/03014467800002671.
It is suggested that concordance rates in twins for anencephaly are higher than can be explained by the high recurrence rates within sibships, and the hypothesized higher rate of anencephaly in MZ pairs. The evidence is stronger in the case of same-sexed pairs, but points in the same direction for opposite-sexed pairs.
有研究表明,双胞胎中无脑儿的一致率高于同胞兄弟姐妹中高复发率以及同卵双胞胎中假设的较高无脑儿发生率所能解释的范围。在同性双胞胎中,证据更为确凿,但在异性双胞胎中也指向相同方向。