The study size is small, leading to a large range in the likelihood
ratios. For instance, body rocking had a range of specificity
from 0.8 to 1.0 and a range of sensitivity from 0.03 to 0.34.
Thus, the LR+ could range from infinity to as little as 0.2 within
a 95% confidence interval.
The population differed from a standard clinic population.
These children were those referred for further evaluation.
The prevalence of epileptic events in this population was 43%, compared
to an incidence of 9.6/100,000 in the broader population which was
quoted in the article.
F, Wyllie E, Kotagal P, Mascha E, Wolgamuth B, Hamer H. Staring
spells in children: Descriptive features distinguishing epileptic
and non-epileptic events. J Peds 1998; 133:660-663.