Table 3 Comparison between group A and group B regarding objective pain and discomfort scale (OPS) at different time of measurement

At arrival to PACU

Mean ± SD

0.00 ± 0.00

0.00 ± 0.00

0.000≠

1.000

NS

Median (IQR)

0 (0–0)

0 (0–0)

Range

0–0

0–0

At 6 h postoperative

Mean ± SD

0.80 ± 0.41

1.48±1.16

− 2.395≠

0.017

S

Median (IQR)

1 (1–1)

1 (1–2)

Range

0–1

0–4

At12 h postoperative

Mean ± SD

1.08 ± 0.49

2.60 ± 2.24

− 3.003≠

0.003

HS

Median (IQR)

1 (1–1)

2 (1–4)

Range

0–2

0–8

At 18 h postoperative

Mean ± SD

1.64 ± 0.57

2.44 ± 1.53

− 1.181≠

0.238

NS

Median (IQR)

2 (1–2)

2 (1–4)

Range

0–2

1–5

At 24 h postoperative

Mean ± SD

2.00 ± 1.47

3.12 ± 1.51

− 2.436≠

0.015

S

Median (IQR)

2 (1–3)

4 (2–4)

Range

0–5

0–5