Table 7.
Total and Preemptive Analgesic Intake at Postoperative Time Intervals in Sham and PBM Groups.
| Time Point | Sham | PBM 650 nm | PBM 810 nm |  |
 |
 |
|||
|---|---|---|---|---|---|---|---|---|---|
| Total n (%) | Preemptive n(%) | Total n (%) | Preemptive n(%) | Total n (%) | Preemptive n(%) | ||||
| 2 hours | 16 (80) | 5 (31) | 10 (50) | 4 (40) | 13 (65) | 7 (54) | 0.04* | 0.34 | 0.29 |
| 6 hours | 13 (65) | 8 (62) | 6 (30) | 4 (67) | 7 (35) | 5 (71) | 0.03* | 0.06 | 0.74 |
| 12 hours | 7 (35) | 4 (57) | 4 (20) | 4 (100) | 4 (20) | 4 (100) | 0.29 | 1.00 | 0.29 |
| 24 hours | 5 (25) | 3 (60) | 1 (5) | 1 (100) | 2 (10) | 2 (100) | 0.08 | 0.55 | 0.21 |
| 48 hours | 3 (15) | 2 (67) | 1 (5) | 1 (100) | 1 (5) | 1 (100) | 0.30 | 1.00 | 0.30 |
| 72 hours | 2 (10) | 1 (50) | 1 (5) | 1 (100) | 0 (0) | – | 0.55 | 0.31 | 0.15 |
Group comparisons were analyzed using the Chi-square test of independence. When expected cell counts were low, Monte Carlo simulation was applied to estimate p-values. p < 0.05 was considered statistically significant. 
= Sham vs PBM 650 nm; 
= Sham vs PBM 810 nm; 
= PBM 650 nm vs PBM 810 nm. *Significant at p < 0.05. Total = total participants taking analgesics. The percentage reported in the Total column represents total analgesic users as a proportion of all participants within each group. Preemptive n = participants taking analgesics at NRS < 4. Preemptive % = percentage of participants taking analgesics at NRS < 4 relative to total analgesic users.