[lemma=□]
[lemma=prevalence]
In Africa , the prevalence may be much higher . Antibody prevalences to all four herpesviruses were similar between cases with other glioma histologies and controls . Higher prevalences of malnutrition in the IDPs in Kenema and other government-held areas outside Freetown have been recorded and these people may be at high risk , although they have received food rations from WFP very recently ( category IIa ) . This prevalence may be somewhat elevated because children under 12 months were included in the assessment ( it is not normal to measure arm circumference on infants less than 12 months as they would naturally have a smaller arm circumference measurement ) . When assessing these results , one should bear in mind that a possible tendency to report more illnesses among people that are better off may outweigh possible higher prevalences of clinical diseases in camps . The two primary goals of the survey are to estimate the prevalence of illicit drug use in the United States , and to monitor trends in prevalence . BMI-for-age references , 36.1 % of the adolescents had low BMI : Younger adolescents had higher prevalences of low BMI than older adolescents . The prevalences of immunoglobulin G antibodies to varicella-zoster virus , herpes simplex virus , cytomegalovirus , and Epstein-Barr virus were 90 % , 71 % , 57 % , and 90 % , respectively .