Electrogastrography: Poor correlation with antro-duodenal manometry and doubtful clinical usefulness in adults

Table 1 Electrogastrography (EGG) and antroduodenal manometry (ADM) variables

1 EGG variables
	(1) Preprandial (fasting) and postprandial percentage of time with dominant frequency in:
	Bradygastria (0.5-2 cycles per minute)
	Normogastria (2-4 cycles per minute) (0.5-2 cycles per minute)
	Tachygastria (4-10 cycles per minute)
	(2) Pre- and postprandial power attributed to the three frequency bands (bradygastria, tachygastria and normogastria)
	(3) Pre- and postprandial dominant power instability co-efficient (DPIC)
	(4) Pre- and postprandial dominant frequency instability co-efficient (DFIC)
	(5) Pre- and postprandial dominant frequency (DF)
	(6) Pre and postprandial period dominant power (PDP)
	(7) Power ratio (ratio of postprandial to preprandial power of dominant frequency)
2 ADM variables
	(1) Pre- and postprandial motility index (MI)
	(2) Pre- and postprandial contractile frequency
	(3) Pre- and postprandial median amplitude
	(4) MI ratio (ratio between postprandial and preprandial motility index)
	(5) Amplitude ratio (ratio between postprandial and preprandial amplitude)