Table 1. Gender and age characteristics of rosacea cases and controls (a) from the discovery group and (b) from the replication group.

Characteristic	Rosacea cases	Controls
(a)Discovery group, n=22,952
n (%)	2,618 (11%)	20,334 (89%)
Female (%)	1,848 (65%)	8,655 (43%)
Age (years)
<30	3 (0.001%)	3 (0.00015%)
30–45	528 (20%)	7,190 (35%)
>45–60	968 (37%)	6,554 (32%)
>60	1,119 (43%)	6,587 (32%)
(b) Replication group, n=29,481
n (%)	3,207(11%)	26,274 (89%)
Female (%)	2,305 (72%)	13,216 (50%)
Age, (years)
<30	0 (0%)	0 (0%)
30–45	527 (16%)	7,554 (29%)
>45–60	1,172 (37%)	9,052 (35%)
>60	1,508 (47%)	9,668 (37%)

The questionnaire was targeted to participants who had self-reported their age as ⩾30 years. A small number of participants in the discovery group may have subsequently changed their age to be <30 years. Their data was included, as the small numbers do not significantly alter the analysis.