Garza-Chapa R, Jiménez-Contreras J A, Riojas-Valdés V A, Cerda-Flores R M
Salud Publica Mex. 1989 Jan-Feb;31(1):32-45.
In order to evaluate the effect of social and biological factors on family size (FS) and secondary sex ratio (SSR) in the families that they would desire to procreate as well as in the ones to which they belong, 1,518 unmarried persons of both sexes, students and workers, who reside in the metropolitan area of Monterrey, Mexico were interviewed. It was found that the average FS desired by the unmarried males and females, independently of their socioeconomic level and years of schooling, were 3.19 and 3.04, which are lower than half the FS of 6.81 observed in the families to which they belong. Both males and females in all the socioeconomic levels and years of schooling, would desire to procreate a larger number of male children: SSR of 0.576 and 0.524, which are higher than the 0.498 observed in the families to which they belong. Also they manifested a strong preference for the birth order of the sex of their children, being of males for the first (SSR of 0.924 and 0.838) and of females for the second (SSR of 0.301 and 0.269). The fact that all children would be of the same sex did not change the desired FS in about 80% of the persons, but in the remainder 20% the desired FS would be increased to an average of five children. In order to reduce the growth rate it would be convenient to offer special counseling on family planning to these persons. In conclusion, the obtained information indicates that aside from the socioeconomic, cultural and biological factors, probably the family planning programs have had a positive influence on the persons that in the near future will start their reproductive stage, and it is possible to anticipate a reduction on the growth rate for the next generation.
为了评估社会和生物因素对他们想要生育的家庭以及所属家庭的家庭规模（FS）和出生性别比（SSR）的影响，对居住在墨西哥蒙特雷大都市区的1518名未婚男女（包括学生和工人）进行了访谈。结果发现，无论社会经济水平和受教育年限如何，未婚男性和女性期望的平均家庭规模分别为3.19和3.04，低于他们所属家庭中观察到的6.81的一半。在所有社会经济水平和受教育年限的男性和女性中，都希望生育更多的男孩：出生性别比分别为0.576和0.524，高于他们所属家庭中观察到的0.498。他们还表现出对孩子性别的出生顺序有强烈偏好，第一个孩子希望是男孩（出生性别比为0.924和0.838），第二个孩子希望是女孩（出生性别比为0.301和0.269）。所有孩子都为同性别的情况并没有改变大约80%的人期望的家庭规模，但在其余20%的人中，期望的家庭规模将增加到平均五个孩子。为了降低增长率，向这些人提供计划生育方面的特别咨询会很方便。总之，所获得的信息表明，除了社会经济、文化和生物因素外，计划生育项目可能对那些在不久的将来将开始生育阶段的人产生了积极影响，并且有可能预计下一代的增长率会降低。
