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Independent t-test for post intervention PEFR of experimental and control groups
| Groups | n | Mean ± SD (litres /min) | t | P-value |
| SCA spirometry group | 24 | 292.08 ± 40.86 | 0.624 | 0.003 |
| SCA control group | 25 | 211.80 ± 48.92 |
SCA = Sickle Cell Anaemia PEFR = Peak Expiratory Flow Rate
