# real prevalence

## real prevalence

a technique of measuring prevalence. It is needed because of the significant errors in estimation of prevalence when the definitive test has high sensitivity but low specificity. When Se = selectivity, Sp = specificity, the real prevalence (RP) can be estimated from the apparent prevalence (AP) by the formula:
$$\hbox{RP}={\hbox{AP\ +\ S}_{\rm p}-1\over \hbox{S}_{\rm p}+ \hbox{S}_{\rm e}-1}}$$
References in periodicals archive ?
genitalium infections in this sample need further study because the relatively small number of infected mothers and children can be a confounding factor and because the real prevalence of M.
The real prevalence of sustained remission may be higher than that--around 15%-20%--"because when some of the patients remit, they don't want to go back and see a psychiatrist," Dr.
Despite these periodic studies, however, the sentinel surveillance system has not been fully operational since 1996, creating doubts about the real prevalence of HTV/AIDS infection, particularly since different sources report conflicting results.
Despite some anecdotal reports on the presence of strongyloidiasis in Italy (1,6), reliable information about the real prevalence of the infection is lacking.
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