Group K

Group D

Group C

P-value¹

P-value²

P-value³

P-value⁴

First request:

Mean ± SD

6.71 ± 4.00

6.06 ± 3.40

3.70 ± 1.75

0.026*

0.711

0.020*

0.021*

Median (Range)

6 (2 - 12)

6 (2 - 12)

4 (2 - 8)

Total morphine dose:

Mean ± SD

7.94 ± 4.70

8.33 ± 3.43

14.00 ± 3.48

0.000*

0.441

0.000*

0.000*

Median (Range)

5 (5 - 20)

10 (5 - 15)

15 (5 - 20)