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Differences for FEV1, FVC and FEV1/FVC between observed values and predicted values according to different reference equations
*P<0.05, compared to observed value by paired t-test. FVC, forced vital capacity; FEV1, forced expiratory volume in one second; STD, standard deviation; diff., difference (observed value minus predicted value); JRS, Japanese Respiratory Society, Mean diff. % (percent mean difference=observed value minus predicted value/mean of observed value±100).
