Broad F E, Duganzich D M
N Z Med J. 1983 Jun 22;96(734):483-6.
The relationship of breast-feeding to the incidence of clear speech at six years of age was examined for 319 New Zealand children of European descent in samples from Putaruru and West Coast. Children were more likely to be breast-fed if first-born, and less likely if the father's occupational group was business or labouring. Differences in clear speech were associated with birth order and socio-economic status. Controlling for these effects, the association of breast-feeding with clear speech was different for the sexes. It was negligible for girls but strongly positive for boys.
对来自普塔鲁鲁和西海岸的319名欧洲裔新西兰儿童进行了研究，以探讨母乳喂养与6岁时清晰语音发生率之间的关系。头胎出生的孩子更有可能接受母乳喂养，而父亲职业为商业或体力劳动的孩子接受母乳喂养的可能性较小。清晰语音的差异与出生顺序和社会经济地位有关。在控制这些因素的影响后，母乳喂养与清晰语音的关联在性别上存在差异。对女孩来说这种关联微不足道，但对男孩来说则呈强烈的正相关。
