Table 2.

Study II data.

Participant_ID#	Ear canal diameter		PAR before training	PAR after training	PAR improvement
	L	R
19	S	S	27.8	30.9	3.1
20	L	L	34.9	35.2	0.3
21	S	S	16.5	28.2	11.7
22	XS	XS	14.0	33.8	19.8
23	L	L	22.4	27.4	5.0
24	XS	XS	33.0	36.3	3.3
25	M	XL	32.7	26.4	-6.3
26	L	L	21.4	28.0	6.6
27	L	M	21.2	15.8	-5.4
28	L	L	40.6	37.6	-3.0
29	L	M	22.5	29.0	6.5
30	S	S	28.9	29.8	0.9
31	M	M	19.3	18.4	-0.9
32	S	S	32.2	26.0	-6.2
Average					2.5
Standard error					1.9

PAR, personal attenuation rating.

Data include ear canal diameter of both left and right ears, pretraining PAR, post-training PAR, and the level of PAR improvement (measured as the difference before and after training).