The lower the parental education, the more likely that their family will be large. To such conclusion scientists from the USA. They conducted a study in which examined the relationship between level of education of adults and their propensity to have children.
Scientific work has shown that people with basic and secondary education more babies are born than those who have decided to obtain one or two degrees. Note, the study took into account many other factors: the body mass index to psychological status of volunteers.
Apparently, the low level of education leaves a person no choice but to deal with family and to leave offspring.
Identified researchers and another pattern. Have tall people, as it turned out, less kids than at low. The genotype, however, no effect on fertility of the family has not.