Scientific Blackpill: Difference between revisions

A study in 2013 examining a total of 2.3 million individuals born in Sweden in 1950-1970, using government health care records, found evidence for substantially lower fertility among sufferers of various mental illnesses. The fertility of the mentally ill was computed by measuring the fertility ratio (e.g. a FR of 0.5 would mean that the diseased group had on average half of the children of the general non-affected population, a FR of 2 would mean double the offspring on average) which reflected the mean number of children that individuals with various mental disorders had, as compared to control individuals of the same age and sex, also accounting for variables such as family size, affected status and parental status.  The youngest individuals involved, at the time their data was recorded, were 40 years old, and had thus likely largely completed their reproductive careers.   

The researchers found evidence of substantially strong selection pressure against schizophrenia (male FR .23 vs female FR .47) , autism (male FR .25 vs female FR .48), and anorexia nervosa (male FR 0.54 vs female FR .81), but not bi-polar disorder.  Depression was weakly negatively associated with fertility for men (FR .93) and not at all for women, and substance abuse disorders was also negatively associated with fertility for men, with a weaker relationship with fertility and the condition being discovered for women (male FR .78 vs female FR .92) It was also found that the selection pressure against these disorders was found to be consistently higher much among men who suffered from them, as compared to the women who suffered from these conditions. This is in accordance with [[Bateman's principle]], which suggests that males of most animal species have greater reproductive variance than females.