Table 1.

Main Publications Reporting Reference Values on Healthy Adults Since 2010

Authors	Technique	Frequency Range (Hz)	Number of Subjects	Age Range	Etnicity/ Nationality	Parameters
Brown et al, 2010103	FOT, PRN	6–19	904	18–92	Caucazian	R6, R11, R19, X6, X11, X19
Fujiwara, 2010104	IOS	5–35	420	20–89	Japanese	R5, R20, FDRrs, X5
Crim et al, 201153	IOS	5–20	555	55±9	Multinational	R5, R20, FDRrs, X5, AX, Fres
Li and Wang,2012105	IOS	5–20	920	56±13	Chinese	R5, R20, FDRrs, X5, Fres
Oostveen et al,201321	IOS, PRN	–	368	18–84	Caucazian	mRrs, mXrs, Fres, AX mRrs, R4–R26, X4–X14, Fres, AX4, AX5
Schulz et al,201325	IOS	5–35	397	45–91	Caucazian	R5, R20, FDRrs, X5, AX, Fres
Xue, 201424	IOS	–	6945	40–65	Chinese	mZrs, R5, X5, Fres
Zheng et al201524	IOS	5–20	362	18–78	Chinese	R5, R20, X5, X20, Fres
Geng et al,201624	IOS	5–20	409	20–60	Chinese	R5, R20, X5, Fres
Shu et al,201624	IOS	5–20	431	48 ± 14	Chinese	R5, R20, FDRrs, X5, Fres
Ribeiro et al,2018106	PRN	4–32	288	20–86	Brazilian	R4, R22, X8, X22