Table 1 Demographic and operation characteristics

Sex (male/female)(N)

9/40

Age (year)

42.22 ± 10.76

BMI (kg/m²)

22.81 ± 3.72

Duration of operation (min)

85.21 ± 44.83

Duration of anesthesia (min)

109.51 ± 45.14

Time interval between induction of anesthesia and initial nerve stimulation(min)

55.67 ± 24.61

Type of thyroid operation

Total thyroidectomy (left/right/both) (N)

19/17/13

Lymph node excision (left/right/both) (N)

15/18/8

Regional lymph node metastasis(yes/no/ undetected) (N)

18/15/8

Substernal thyroidectomy(N)

1

Papillary thyroid carcinoma/follicular thyroid adenocarcinoma(N)

47/2

TNM staging (American Joint Council on Cancer)

< 55year(I/II/III/IVa/IVb)(N)

≥ 55 year(I/II)(N)

44/0

3/2

Number of patients used muscle relaxant antagonists intraoperatively:Sugammadex/ neostigmine(N)

17/32

The hospitalization time(day)

4.72 ± 2.00

TOFr value in subgroup V

0.67 ± 0.36

TOFr value in subgroup R

0.65 ± 0.36

TOFr value in group VR

0.66 ± 0.36