TABLE 2.

Multiple regression analyses

		Partial contribution				Total
		Packing density		Perikaryal area
	PD	R 2	P	R 2	P	R 2	P
Maximum amplitudea	20	0.15	0.37	0.15	0.37	0.30	0.071
	50	0.13	0.40	0.10	0.50	0.23	0.14
Slopeb	20	0.43	0.038	0.18	0.29	0.61	0.0014
	50	0.48	0.027	-0.03	0.85	0.46	0.014
Thresholda	20	0.14	0.41	0.21	0.24	0.35	0.041
	50	0.00	0.96	0.00	0.95	0.00	1.0
Dynamic rangea	20	0.19	0.28	0.30	0.12	0.49	0.0066
	50	0.22	0.17	-0.02	0.90	0.21	0.17
Level50% a	20	0.22	0.24	0.26	0.17	0.47	0.008
	50	0.49	0.019	-0.04	0.74	0.45	0.012
Latencya	20	0.19	0.27	0.38	0.052	0.57	0.0017
	50	0.40	0.012	0.41	0.011	0.80	< 0.001

For each eCAP characteristic separately, and for short and long PD, the difference as a result of IPG increase from 2.1 to 30 μs is put in a multiple regression model with SGC perikaryal area and packing density as predictors

^a N = 18

^b N = 17