Correlation between treatment response and cough
Since the multivariate model showed that cough was associated with treatment response, we conducted an additional analysis for cough (Table 4). We classified cough into 2 groups based on symptoms; some patients had intermittent cough in particular situations or time, especially during sleep at night, while others experienced persistent cough all day. Treatment response showed a negative association with the degree of cough (86.7% in no cough vs. 75.0% in intermittent cough vs. 47.1% in persistent cough, P = 0.023).