Table 4.
Overall rate of SSI for the study and control groups
| Oxygen supplementation | SSI | No SSI | Total |
|---|---|---|---|
| Oxygen 30 % | 13(a) | 81(b) | 94(r1) |
| Oxygen 60 % | 8(c) | 86(d) | 94(r2) |
| Total | 21 | 167 | 188 |
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