evidence: Number of times oxygen saturation fell below 95%, in each patient in experimental and control group was subjected to Mann–Whitney U-test [Table 1]. The mean value shows about eight fold increased alarms in control group compared to experimental group. However no statistically significant differences were found between the two groups (P = 0.683).
intervention: preoperative oral sedation (diazepam)
comparator: without it
outcome: Number of times oxygen saturation fell