Table 2 Comparison of parameters of LSPB and intraoperative sufentanil dose between the two groups (mean ± standard, median (25–75 IQ))

2.0(1.0,2.0)

4.0(3.0,4.0)

P1 < 0.01^*

48.8 ± 8.9

113.8 ± 8.0

P2 < 0.01^*

Time for nerve block (S)^a

Lumbar plexus

236.9 ± 12.0

318.7 ± 13.1

P3 < 0.01^*

Sacral plexus

304.4 ± 11.1

300.3 ± 9.9

P4 = 0.029^*

Time of puncture attempts (time)^b

Lumbar plexus

1.0(1.0,1.0)

2.0(1.0,3.0)

P5 < 0.01^*

Sacral plexus

2.0(2.0,3.0)

2.0(2.0,3.0)

P6 = 0.802

25.1 ± 3.1

26.0 ± 3.0

P7 = 0.142