prevalence

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Period prevalence of disease excludes Mycobacterium gordonae (a rarely pathogenic species) and is calculated as the total number of persons whose illness fulfilled disease criteria ([greater than or equal to] 2 sputum nontuberculous Mycobacterium isolates or 1 bronchoscopic or biopsy nontuberculous Mycobacterium isolate) during 1 of the 5-year periods of interest (1998-2002 and 2006-2010), divided by the Ontario population at the midpoints of the periods (2000 for 1998-2002 and 2008 for 2006-2010).
Period prevalence rates were obtained for each racial group.
Firstly, admission register lists of all hospitalised children were used to determine HIV status (collected from laboratory and/ or hospital records) and calculate HIV period prevalence.
Period prevalence estimates of blood doping for the various subpopulations of samples are shown in Table 2.
measuring the conditions of a population at a certain point in time) as opposed to period prevalence (i.
We determined period prevalence of asthma at baseline by taking the number of definition 1 or 2 asthma cases occurring from birth to 12 months after the index BLL and dividing it by the total number of children in the cohort at that time.
We performed a period prevalence study using 120 patients seen for routine medical care at an urban family medicine center.