Table 3 Cumulative morphine consumption

Morphine titration consumption (mg)

2.00 (1.00, 4.00)

2.00 (0.00, 2.00)*

0.037

Morphine PCA use (mg)

1.00 (0.50, 2.00)

0.00 (0.00, 1.00)*

0.002

3.00 (2.50, 4.00)

2.00 (1.00, 2.50)*

< 0.001

8.00 (6.00, 10.50)

7.00 (6.00, 8.00)

0.089

13.00 (10.50, 16.00)

13.00 (11.50, 14.00)

0.718

17.00 (14.00, 19.00)

16.50 (15.00, 19.50)

0.617