孤僻症是一种普遍存在的大脑失调症状。注意：它是一种失调，而不是一种疾病。这种失调到底有多普遍呢？人们对孤僻症患病率的评估各有不同，这取决于临床标准。 有些评估表明孤僻症的患病率很低，每10000 人中只有5例；但是也有一些评估表明患病率很高，每80人中就有1例。孤僻是指孤寡怪僻而不合群的人格表现缺陷。
研究者也考虑了影响孤僻症治疗的因素，包括父母的教育水平和种族。
The researchers took into account factors that might affect autism diagnosis, including parents' education and race.
研究学者与孤僻症专家认为，新的调查更为可信，它的调查范围更广。
Researchers and other autism experts said the new study is more convincing, partly because it's larger.
母亲的年龄越大，生出的小孩的遗传病的机率越高，而基因与孤僻症息息相关。
Older mothers are known to face increased risks for having children with genetic disorders, and genes are thought to play a role in autism.
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