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| Study Groups | Mean | Standard Deviation |
| Control | 25.05 | 3.00125 |
| Oxygen | 22.00 | 2.08986 |
| Air | 42.00 | 2.04158 |
| Argon | 27.00 | 3.00000 |
| 10% Argon-90% Oxygen | 30.00 | 1.05276 |
| 20% Argon-80% Oxygen | 44.00 | 3.00000 |
