This case-control study compared clinical characteristics in 23 adults with psychogenic cough vs 520 adults with non-psychogenic cough. While psychogenic cough has been extensively studied in children, this condition is less well described among adults. I have the following comments and questions.

1) Background, line 61 says global prevalence of chronic cough is 9.6%, but the prevalences differ markedly between countries and populations. It may be more appropriate to give the range of chronic cough prevalences than an estimated global prevalence.

2) Background, line 76 says psychogenic cough was the most common cause of chronic cough in children, but this is not a totally correct description as per the reference given ( #7)?

3) Statistical analysis, line 118: please give whether p-values were two-tailed.

4) Results: please give whether all of the study subjects had chronic cough according to the definition given in Methods (a cough lasting more than 8 weeks).

5) Line 154-155: would suggest to remove "..and other".

6) Line 164: would suggest changing "(4)" to "(n=4)" to improve readability.

7) Line 170: change to "In this study, we analysed clinical features of psychogenic cough in adult patients and found they were more often younger with...."?

8) Line 176-178 says psychogenic cough was slightly more common in males, but Table 2 indicates there was no statistical significant difference (P=0.22). The sentence should be changed to indicate that there was no significant difference in sex between the study groups.

9) Line 196: change to "...with psychogenic cough had dry cough, while the prevalence of nocturnal.."?

All of my comments have been sufficiently addressed, I have no further criticisms.