Table 2 Postoperative numerical rating scale (NRS) pain scores(score, \(\bar x\) ±s)

NRS at rest

Group A(n = 46)

3.00 ± 0.70

3.72 ± 0.72

3.59 ± 0.69

3.26 ± 0.65

2.83 ± 0.64

2.33 ± 0.52

Group B(n = 48)

3.10 ± 0.93

3.27 ± 0.57

3.17 ± 0.63

2.65 ± 0.84

2.48 ± 0.62

2.08 ± 0.40

t-value

0.61

-3.33

-3.10

-3.97

-2.67

-2.54

P-value

0.54

0.00

0.00

0.00

0.01

0.01

NRS at cough

Group A(n = 46)

4.09 ± 0.66

4.76 ± 0.67

4.78 ± 0.66

4.43 ± 0.62

3.96 ± 0.56

3.54 ± 0.59

Group B(n = 48)

4.13 ± 0.98

4.42 ± 0.61

4.29 ± 0.87

3.71 ± 0.85

3.58 ± 0.68

3.13 ± 0.70

t-value

0.22

-2.59

-3.06

-4.72

-2.91

-3.13

P-value

0.83

0.01

0.00

0.00

0.01

0.00