Figure
Summary receiver operator characteristic curve (SROC) for the most
sensitive assay type reported from each of the 22 studies with complete
values for true positive, false positive, true negative, false negative.
This included papers with a range of different positivity thresholds for
stimulation index (SI) (SI range between 2 to 3). Individual study
values plotted and colour coded to reflect the assay type and size to
represent number of participants. AUC 0.788, I2 55.3%
(27.9% - 72.4%), tau2 = 0.252, p-value
<0.0001