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The test was repeated at intervals of 30 seconds until 3 technically acceptable traces were obtained. Forced expiratory volume in one second (FEV 1) and Forced vital capacity (FVC) were recorded and the data expressed as FEV 1 % predicted and FEV 1 /FVC ratio. Short-acting β2-agonists were withheld for at least four, and long-acting for at ... ................
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