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Standardized log-rank statistics of all possible cutoff values, indicating the optimal cutoff value as determined by the maximum standardized log-rank statistic [M] for (A) the FEV1/FVC ratio, (B) FEV1 (% of predicted), and (C) FVC (% of predicted). FVC, forced volume vital capacity; FEV1, forced expiratory volume in 1 second.
