In addition, there was not a statistically significant difference in relative TRPA-1 expression between the IPF group and the control group (β = 0.150, 95% CI = - 0.399, 0.698, p = 0.579), or the CC group and the control group (β = 0.190, 95% CI = -0.338, 0.718, p = 0.466) when gender, ex-smoking status and age were taken into account (R2 = 0.065). Here, TRPA1 is linked to idiopathic pulmonary fibrosis.