Table 2 Subgroup analyses of postoperative pain scores according to SAPB types
SAPB type | Postoperative time point, hours | No. of studies | Sample | I2 (%) | MD | 95%CI | P |
|---|---|---|---|---|---|---|---|
Superficial SAPB | 6 | 4 | 146/146 | 98.0 | -1.90 | -2.88 to -0.92 |  < 0.001 |
12 | 4 | 134/133 | 97.6 | -1.66 | -2.55 to -0.77 |  < 0.001 | |
24 | 4 | 134/133 | 95.8 | -1.06 | -1.89 to -0.24 | 0.012 | |
Deep SAPB | 6 | 4 | 129/127 | 94.0 | -2.28 | -3.81 to -0.75 | 0.003 |
12 | 4 | 129/127 | 88.6 | -2.01 | -3.03 to -0.99 |  < 0.001 | |
24 | 4 | 129/127 | 0 | -1.27 | -1.63 to -0.91 |  < 0.001 |