Gray E, Bortolozzi J, Hurt V K
J Hered. 1979 Jan-Feb;70(1):67-9. doi: 10.1093/oxfordjournals.jhered.a109193.
During 1977--78, 715 unmarried college students at the Universidade Estadual Paulista, Botucatu, Brazil, were surveyed for their preferences for family sizes and combinations and permutations of sexes of children. The most preferred family size by both male and female respondents was two children. A slightly lower proportion of respondents preferred a family size of three children. Average size of the desired families was approximately 2.76 children. The most preferred combinations of sexes were one male, one female; one female, two males; and two females, two males, respectively, in families of two, three, and four children. Preferred permutations of sexes were those in which the first child was male and subsequent children resulted in an alternation of sexes.
1977年至1978年期间，对巴西博图卡图圣保罗州立大学的715名未婚大学生进行了调查，了解他们对家庭规模以及孩子性别组合和排列的偏好。男性和女性受访者最喜欢的家庭规模都是两个孩子。略少比例的受访者更喜欢三个孩子的家庭规模。理想家庭的平均规模约为2.76个孩子。在有两个、三个和四个孩子的家庭中，最喜欢的性别组合分别是一个男孩、一个女孩；一个女孩、两个男孩；两个女孩、两个男孩。最喜欢的性别排列是第一个孩子是男孩，随后的孩子性别交替。
