In an epidemiological study by van Gessel, Gaßmann and Kröner-Herwig [3] children between 9 and 14 years reported a six-month prevalence that ranged from 56.6 to 75.1 %, depending on the age and sex of the child.
In an epidemiological study, the intensity of disease outbreak cases varies with time.
In an epidemiological study on 4590 school children in India, the rate of NB was reported as 12.7% [ 9].
In an epidemiological study, OCD was found to affect mostly female adults and male children and adolescents.
In an epidemiological study, younger persons showed an increased risk of PTSD compared to elderly persons [ 24].
In an epidemiological study, 40% of subjects with PTSD still had the disorder after 6 years [ 36].
In an epidemiological study including about 7,000 new patients, the prevalence of RA was 15% and for SLE it was 8.9%.
In an epidemiological study based on a questionnaire sent to all registered owners of Icelandic horses in Sweden, the prevalence was found to be 16.6%.
In an epidemiological study of HH carried out in 1994 in hospitals affiliated to the University of Geneva, was observed an average rate of compliance of 48% [ 14].
In an epidemiological study conducted by the same author at the same period [ 30] around Leningrad Russiaa), C. burnetii was detected in field-collected bedbugs, with the Q fever prevalence there estimated at 29.2% of the population.
In an epidemiological study conducted in seven rural communities in this area with a population ranging in age from 6 to 22 years, the prevalence of dental fluorosis was 80.4% and of severe dental fluorosis was 48.9% [ 16, 17].
