Time (in minutes) Group 1 Mean ± SD Group 2 Mean ± SD Group 3 Mean ± SD p-value p-value (1 versus 2) p-value (1 versus 3) p-value (2 versus 3)
5   98.90 ± 0.89  100 ± 0.22 99.20 ± 0.82 <0.001 (HS) <0.001(HS) 0.12(NS) <0.001(HS)
10 98.70 ± 0.88 99.70 ± 0.51 98.90 ± 0.84 <0.001(HS) <0.001(HS) 0.29(NS) <0.001(HS)
20 98.80 ± 0.81 99.80 ± 0.41 98.93 ± 0.79 <0.001(HS) <0.001(HS) 0.46(NS) <0.001(HS)
30 98.60 ± 0.70 99.80 ± 0.48  98.98 ± 0.62 <0.001(HS) <0.001(HS) 0.01(S) <0.001(HS)
The mean difference is significant at p-value<0.05 and highly significant at p-value<0.001.
S: Significant; HS: Highly Significant; NS: Not Significant.
Table 7: Intergroup comparison of oxygen saturation (%) at various intervals after giving premedication.