From: The effect of combined treatment with morphine sulphate and low-dose ketamine in a prehospital setting
NRS at scene
NRS at admission hospital
M-group
MK-group
Mean
8.5
7.5
5.4*
3.1*
Median
9.0
5.0*
3.0*
SD.
1.6
1.8
1.9
1.4
Percentiles 25
7.0
6.0
4.0
2.0
50
5.0
3.0
75
10.0
9.5
3.8