Table 2.

Stimulation parameters at 1 month, 1 year, 5 years and 8 years of follow-up

Stimulation parameters	1 month	1 year	5 years	8 years
Amplitude (V)	2.2 ± 0.3 (1.6-2.7)	2.6 ± 0.4 (1.9-3.3) ※	2.7 ± 0.4 (1.9-3.5)※#	2.8 ± 0.4 (2.2-3.6)※#
Pulse width (μs)	60.0 ± 0.0 (60–60)	75.8 ± 15.2 (60–90)※	80.8 ± 17.3 (60–120)※	80.8 ± 17.3 (60–120)※
Rate (Hz)	163.2 ± 14.2 (130-185)	159.9 ± 13.3 (130–185)	150.1 ± 12.2 (130–160)※#	141.3 ± 14.6 (85-160)※#Δ

Data presented as mean ± SD (range).

※ p significant compared with 1 month after surgery.

# p significant compared with 1 year after surgery.

△ p significant compared with 5 years after surgery.