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| Study Groups | Mean | Standard Deviation |
| Control | 8.00 | 0.000 |
| Oxygen | 23.03 | 1.000 |
| Air | 10.00 | 0.000 |
| Argon | 4.00 | 0.000 |
| 10% Argon-90% Oxygen | 14.00 | 0.000 |
| 20% Argon-80% Oxygen | 17.00 | 0.000 |
