TABLE 3.

Summary of reference limits and bootstrap mean interval widths and standard errors for transformed and untransformed distortion product otoacoustic emissions levels

Scale	Method	Lower	Upper	Mean Reference Interval Width	Standard Error of Mean Reference Interval Width
Original	Percentile	−2.50	4.80	4.7	1.7
	VD	−3.59	3.59	3.5	0.6
	VSEM	−3.57	3.57	3.4	0.6
	VM	−3.61	3.61	3.0	0.5
	VAdjusted	−3.49	3.49	3.0	0.5
Transformed	Percentile	−2.62	5.37	4.6	1.3
	VD	−3.44	3.44	3.3	0.5
	VSEM	−3.40	3.40	3.3	0.5
	VM	−3.45	3.45	2.9	0.5
	VAdjusted	−3.34	3.34	2.8	0.4

V_D, variance of observed shifts; V_M, variance using the model-based approach; V_SEM, variance based on the standard error of measurement.