text: The relation was equally strong in patients with severe pulmonary disease ; for patients with FEV1 < 1.51 the mean difference was 0.21 ( 0.80 ) mmol/min/kPa .
entities.text: relation
entities.type: outcome
entities.text: FEV1
entities.type: outcome
entities.text: patients with severe pulmonary disease
entities.type: participant