Taking a mean prevalence rate of 70% of TBLN among presumptive cases [ 6, 7, 9], 200 consecutive presumptive TBLN cases needed to be included in the study.
The sample size for the study was determined as described by Thrusfield [ 10] taking an estimated prevalence of 33.27 % of mange mites [ 11]; accepted error 5%% and confidence level of 95%%.
To estimate the power for smoking cessation we have taken a smoking prevalence of 45% [ 56].
We took (a) the prevalence (presence/absence) and (b) the infection intensity (FEC) data as response variables.
To ensure an adequate sample size for our other analyses we have taken a point prevalence of BPSD of 31% from a community based sample of people with dementia [ 10].
The prevalence of taking a statin and meeting the LDL goal was highest for older adults (≥75 vs. 20 49 years), men versus women, non-Hispanic whites versus non-Hispanic blacks, and people with longer disease duration (<5 vs. ≥20 years; P < 0.05).
As criterion A in DSM-IV for PTSD, which focuses on the nature and personal response involved in the traumatic experience, was not specifically assessed, the occurrence rate of PTSD could not be taken as a prevalence estimate for PTSD in a straightforward manner.
Table 5 reports a PPV and NPV of ≥200 and 400 ng/mL, as well as for the progressive elevation of αFP ≥7 ng/mL/month taking into account a prevalence of 5 and 10%.
Our method takes a population mortality rate and prevalence rates for CVD and adjusts them using the mean values for risk factors in the given population.
