Table 2.

Somatosensory evoked potentials. Intrasubject change (absolute) in latency (ms) during the pilot and extension studies for subjects with both baseline and end-study measurements.

4-Month pilot study				12-Month extension study
Subject number:	1	3	5	5
Median nerve
N9-N13A	Absent	0.80	Absent	Absent
N9-N13B	Absenta	−0.60	Absent	Absent
N9-P13	Absent	1.10	Absent	Absent
N13A-N20	Absent	−0.40	Absenta	6.5
Posterior tibial nerve
N22-P30	Absent	1.00	Absent	Absent
N22-P40	Absent	0.80	2.40	8.8

^aN9–N13B was present at baseline in subject 1 at a latency of 3.30 ms but absent at the Day 120 visit. N13A-N20 was present in subject 5 at the Day 120 visit at a latency of 10.8 ms but absent at baseline. Subject 2 did not have baseline measurements (the subject was not enrolled in the pilot study). Subject 4 did not have day 120 measurements (termination of participation due to subject death).