Statistical inaccuracies over use of facial skin care products and sunscreens in the aetiology of frontal fibrosing alopecia: reply from authors.

We did not perform a matched one-to-one comparison between FFA subjects and controls, we compared two groups with similar ages. The only continuous variable was age. The responses to the questions posed were categorical. We therefore maintain that a Fisher's exact test rather than a McNemar's test was an appropriate method for analyzing the results.