Analgesia Scores
One patient did not complete their analgesia diary and was therefore excluded. Of the remaining 48 patients, requirement for analgesia was greater in the microscopic group at day one compared to the endoscopic group (100 %, 17/17 microscopic group vs. 64.5 %, 20/31 endoscopic group p= 0.004) (Table 3). Difference in analgesia requirements did not reach significance at each of the other post-operative days studied (Table 3). In addition, requirement for opioid analgesia was higher in the microscopic group at day one (p=0.001) and day two (OR: 6.71; p= 0.030) although significance diminishes thereafter (Table 4). Post-hoc power calculation based on the findings of a recent study confirmed our study size to have sufficient power (92.7% with alpha 0.05).5 The minimum sample size requirement is 9 for each arm to reach alpha of 0.05 and power of 80% to assess the analgesia requirement on post-operative day-1.