(In Taiwan, government statistics put the number of mentally disabled and multiply-disabled with mental disability as the primary disability at 150,000, a prevalence of only 0.6 %.) Mental disability can arise from several causes, including: 1.Prenatal factors, including heredity, genetic and chromosomal abnormalities, and congenital endocrinal and metabolic disorders.
（依據內政部統計，我國智能障礙者，及以智障為主的多重障礙者人數約 15 萬人，盛行率僅為 0.6 %）形成智能障礙的原因不一，包括：1. 產前因素：遺傳、染色體基因異常、先天性內分泌代謝疾病等。