Robins, D. L. Prevalence counts: commentary on "Prevalence and characteristics of autism spectrum disorder among 4-year-old children in the autism and developmental disabilities monitoring network".
Prevalence rates (p) describe populations (i.e. prevalence counts) as a proportion of the total, for example: pX = X/ T, pC = C/ T, pXC = XC/ T, pS = S/ T. (1) Here, prevalence is presented in terms of the disjoint populations X, C and XC, and the notation from the right-hand column of Table 1 is used.
The prevalence counts of methicillin-resistant Staphylococcus aureus, vancomycin-resistant enterococc, Clostridium difficile infections and extended spectrum beta-lactamase; the rates of hand hygiene product usage and antibiotic data were collected by hospital personnel not supervised by the researcher, limiting the ability to assess the rigour of data collection.
The South Carolina Children's Educational Surveillance Study (SUCCESS) was designed to determine ASD prevalence via population-based screening and direct assessment and to compare prevalence results to ADDM and administrative prevalence counts.
Prevalence data was log transformed and the few zero disease prevalence counts that did occur removed in order to achieve a normal/pseudo-normal distribution.
The second meaning is equivalent to the prevalence count for the population group.
In the Medicaid database, annual prevalence counts for DM and interstitial myositis were also low.
N-year limited-duration prevalence counts include only those survivors diagnosed in the last N years before the index date.
Overall, the hospital reports a prevalence count of patients identified with MRSA, VRE, CDI and ESBL isolates per month.
Thus, the estimated prevalence rates were calculated by using the proportion of cases or prevalence count of patients, over the total population at a given time.
