If enough parents deliberately or unintentionally avoided reporting delayed development, the findings could be skewed, the researchers said.
如果足够多的父母有意或无意地回避说出发育滞后的情况，那么结果就会产生偏差。
They now plan to study the function of the missing genes. Previous studies have suggested that deletions of these genes may be linked with delayed development, autism and schizophrenia.
他们目前计划研究这些丢失基因的作用。早期的研究表明这些基因缺失可能与发育迟缓，自闭症和精神分裂症有关联。
Indications of severe impairment include blindness, hearing loss, cerebral palsy, and significantly delayed development.
严重损伤包括失明、听力丧失、大脑性瘫痪、明显发育迟缓。
Indications of severe impairment include blindness, hearing loss, cerebral palsy, and significantly delayed development.
严重损伤包括失明、听力丧失、大脑性瘫痪、明显发育迟缓。
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