Author Time of Assessment Mean control (opioid) group VAS, cm (SD) Number of patients in group Mean regional (femoral block) group VAS, cm (SD) Number of patients in group
Wang Recovery room 7.8 (1.6) 15 4.2 (2.9) 15
Wang POD 1ยง 5.5 (2.1) 15 2.7 (2.6) 15
Chan - pre-op block group POD 1 3.9 (1.2) 20 1.9 (1.2) 20
Chan - post-op block group POD 1 3.8 (1.3) 21 1.6 (1.3) 21
Weighted Mean VAS Score: 4.7   2.0  
ยงPostoperative Day #1
Table 4: VAS postoperative pain scores for knee arthroplasty.