According to several reports, serotypes 3, 4, 7 and 21 usually cause large scale respiratory illnesses and fulminate prevalence events, causing respiratory illness such as severe lethal pneumonia and pharyngoconjunctival fever [ 20, 21].
For such low-prevalence events, although the P0 is reasonable (0.95), the initial calculation of Kappa is low (0.28).
Contrary to the classic (Sullivan) healthy life table [ 5], which combines prevalence with event rates, the MSLT is internally consistent by building exclusively on event rates [ 6].
Indeed, the prevalence of event may be far from 0.5 in clinical situations.
Based on nationwide registries of two Nordic countries, we could explore the association between bereavement and ED before the age of 3 with 0.18 % prevalence (rare event).
These ratios are one step closer to providing a clear cost benefit analysis, because they only need to be multiplied by a prevalence or event rate to provide an estimation of cost in terms of false alerts.
A summary of patient risk factor prevalence and outcome event rates by year are shown in Table 1.
Group size should be adjusted under conditions where the prevalence of events is low such that the expected number of events in each group should be greater than one.
We adopted log-binominal regression models rather than logistic regression models as the prevalence of outcome events (change in smoking behavior after marriage) was relatively large [ 24, 25].
First, the prevalence of events identified as being of international public health concern might not reflect the prevalence of events truly reported to WHO.
