If I have understood right, hypopneas were scored from airflow, thorax or abdomen signals. Nowadays, AASM rules state that hypopnea scoring should be done from airflow signal, which was not the case while SHHS datasets were scored.
RESPSCCH variable has some information from SHHS1 measurements, which signal(s) were used at hypopnea scoring, but almost half are still unknown, and for SHHS2 dataset there is no such variable.
I would like to know if there is some variable, or other way, to know which signals were used at hypopnea scorings.
I am matching my own desaturation scorings to respiration events (in profusion.xml files), and calculating AHIs (and ODIs) and our research team's own parameters, which include duration and/or area calculation of respiratory events. But if I use scorings from thorax/abdomen belt and calculate related area/duration in airflow signal, this could cause problems/inaccuracies in some cases. Especially if no clear event is seen in airflow signal. Or at least it would be difficult to state that desaturation-respiratory event matching was performed according to AASM rules.
I hope you guys have some idea how to get around this problem, or some suggestion how to identify if event scored in thorax/abdomen signal could have been also identified from airflow signal.