Concordant obstructive cases (FEV1/FVC < 0.70 & <LLN) showed a trend towards more severe airways obstruction than discordant obstructive cases (FEV1/FVC < 0.70 & ≥LLN), see Table 3 . 89.3% of discordant obstructive cases had a FEV1 greater than 70% of its predicted value, and none of the discordant obstructive cases had a FEV1 less than 50% of its predicted value.
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Subjects with Discordant Airways Obstruction: Lost between Spirometric Definitions of COPD.
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