Rondal J A, Ghiotto M, Brédart S, Bachelet J F
Laboratoire de Psycholinguistique, Universite de Liege, Belgium.
Am J Ment Retard. 1988 Jul;93(1):64-6.
Mean length of utterance (MLU) of children with Down syndrome was examined and found to correlate highly with chronological age, r = .87, p less than .001, despite the children's language delays. The correlation was reliable at least up to MLU 3.00. In the 1.00 to 3.50 range, MLU also predicted grammatical complexity.
对唐氏综合征患儿的平均语句长度（MLU）进行了检查，发现尽管这些患儿存在语言发育迟缓的情况，但MLU与实际年龄高度相关，r = 0.87，p小于0.001。至少在MLU达到3.00之前，这种相关性都是可靠的。在1.00至3.50的范围内，MLU也能预测语法复杂性。
