Signal Persistence of Bispectral Index and State Entropy during Surgical Procedure under Sedation

Table 1

Number of data points of SE and BIS with artifact or good signal.

	EC period (𝑛=1370)		Non-EC period (𝑛=6309)		All periods (𝑛=7679)
	BIS	SE	BIS	SE	BIS	SE
Artifact	255	88	223	395	478	483
Good signal	1115	1282	6086	5914	7201	7196
Artifact ratio	18.6%*	6.4%	4.1%	7.3%*	6.2%	6.3%

Artifact ratio: number of artifacts/number of all signals, EC: electrocautery, BIS: bispectral index, SE: state entropy, comparisons between BIS and SE for each period, *two-tailed 𝑃<0.0001, chi-square with Yates correction.