Table 1. The values of the median of the normalized peak amplitudes, PA, in the frequency band B1 for the groups of records.

TPEHGT DS
Group	Median PA, band B1, Signals S1, S2, S3, TOCO
	Contraction intervals				Dummy intervals
	S1	S2	S3	TOCO	S1	S2	S3	TOCO
35 preterm nonlabor intervals	0.045	0.015	0.026	0.015	0.144	0.024	0.065	0.015
12 preterm labor intervals	0.054	0.024	0.050	0.025	0.148	0.029	0.058	0.016
41 term nonlabor intervals	0.076	0.038	0.062	0.123	0.251	0.096	0.132	0.084
12 term labor intervals	0.060	0.039	0.065	0.013	0.328	0.055	0.167	0.019
41 term nonlabor intervals	0.076	0.038	0.062	0.123	0.251	0.096	0.132	0.084
35 preterm nonlabor intervals	0.045	0.015	0.026	0.015	0.144	0.024	0.065	0.015
Average	0.061	(0.027)	0.044	(0.069)	0.198	(0.060)	0.099	(0.050)
Ratio	1.689	$\boxed{\mathit{2}.\mathit{533}}$	2.385	$\boxed{\mathit{8}.\mathit{200}}$	1.743	$\boxed{\mathit{4}.\mathit{000}}$	2.031	$\boxed{\mathit{5}.\mathit{600}}$
41 term nonlabor intervals	0.076	0.038	0.062	0.123	0.251	0.096	0.132	0.084
Max (47 preterm intervals)	0.054	0.024	0.050	0.025	0.148	0.029	0.065	0.016
Average	0.065	(0.031)	0.056	(0.074)	0.200	(0.063)	0.099	(0.050)
Ratio	1.407	$\boxed{\mathit{1}.\mathit{583}}$	1.240	$\boxed{\mathit{4}.\mathit{920}}$	1.696	$\boxed{\mathit{3}.\mathit{310}}$	2.031	$\boxed{\mathit{5}.\mathit{250}}$

The highest values of the median of the PA per signal are in bold. Boxed are the highest ratios of the medians for the EHG signals and for TOCO signal. Bracketed are the averages of the medians for the signals with the highest ratios.