In women, ever smokers and smoking amount showed a numerical trend towards lower risk of death and hospitalisation, but were only significantly associated with respiratory hospitalisation (Additional file 1: Table S2 and Table S3 ).
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Smoking status and clinical outcome in idiopathic pulmonary fibrosis: a nationwide study.
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Smoking amount showed a numerical trend towards lower risk of death and hospitalisation, but did not reach statistical significance in either age group (Additional file 1: Table S5 ).