Childhood exposure to farming environment was significantly more common in N-ERD than asthma without N-ERD, whereas a nonsignificant trend was seen compared to healthy controls.
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The sentences
Figure 3 shows a clear trend of increasing respiratory symptoms, with the mildest symptoms in NSAID-induced dyspnoea without N-ERD and the most severe symptoms in the N-ERD subgroups ( figure 3 , supplementary table S4 ).