A Survey of Statistical Studies on the Prevalence and Incidence of Mental Disorder in Sample Populations

Cereals and Schizophrenia Data and Hypothesis

“…However, there is a fair amount of evidence indicating that schizophrenia is less likely to occur in some than in others. The problems involved and some of the results achieved have been clearly presented by Lin & Standley (1962), Biiok (1953), Lin (1953)) and Lemkau, Tietze & Cooper (1943). The nature of the problem makes the acquisition of entirely satisfactory evidence a practical impossibility.…”

“…Biiijk (1953) and Lemkau (1943) have presented in table form the results of calculations of the "morbid risk" ("expectancy") of developing schizophrenia as determined from published studies, including their own. The calculations are based on the age distribution of the population at risk and the number and ages of the individuals with past or present illness from schizophrenia discovered within that population.…”

Summary and Conclusions

“…Interpretations from findings of population studies have possibly the greatest value in suggesting hypotheses of correlation which could be properly tested with more detailed studies. As Lemkau et al (1943) pointed out, "Poor selection of sample populations and insufficient numbers of cases as well as differences in investigative methods, differences in fundamental concepts, and differences in diagnosis and classifiction tend to make the available studies of prevalence and incidence of mental disorder basically incomparable." For the same reasons, I found very few studies comparable to the present study.…”

Statistische Untersuchungen über die Anfälligkeit Tuberkulöser für Geisteskrankheiten

“…Im m i g ra n te n erk ran k e n häufiger als gebürtige A m erikaner [7] und u n te r den E rsteren w iederum Italien e r etwra häufiger als D eutsche [7], Farbige erk ran k e n w ahrscheinlich häufiger als W eiße [7], jedoch sind hierüber keine zuverlässigen S ta tistik e n b e k a n n t. G ro ß sta d t bevölkerung ist fü r Schizophrenie anfälliger als L an dbevölkerung [7] und hier w iederum sind die sozial schlechtgestellten G ruppen am m eisten g efäh rd et. Insbesondere steig t die S chizophreniew ahr scheinlichkeit m it der «U nstetigkeit», der m angelnden V erw urzelung der B evölkerung [8,9,10,11] und t r i t t bei dem stä n d ig den W o h n sitz wechselnden, die g ro ß städ tisch e n Slum s d u rc h flu te n d en , u n steten , vagierenden «B odensatz» der B ev ölkerung am häu fig sten in Erscheinung.…”