3.1 Primary outcome
The mean OM pain score reduction at 60 min after drug administration in the ketamine group was 1.64 points (on the 6-point faces pain rating scale), while that in the placebo group was 1.32 points, with a group difference of 0.32 points. The difference in the pain score between the two groups was not statistically significant (p=0.425). (Table 2)
The reduction in OM pain score in the two groups was measured at 15, 30, 45, 60, 120, 180, and 240 minutes after drug administration. The maximum difference in the mean reduction in pain score between the two groups was noted at 45 minutes (0.36 points) (Figure 2).