Table 2 Stimulation parameters at 1 month, 1 year, 5 years and 8 years of follow-up

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