Table 1.

Background data of the study groups

	Psoriasis (n = 27)	Periodontitis (n = 58)	Orally healthy controls (n = 52)
Gender male/female	16/11	33/25	27/25
Age (mean, range) years	55.3 (38–74)	53.4 (38–76)	54.8 (40–80)
Smoking status (Non‐/former/current smoker)	15/10/2*	20/15/23	30/16/6*
Heart disease (Y/N)	0/27	5/53	8/44
Diabetes (Y/N)	2/25	4/54	4/48
Regular dental care (Y/N)	23/4*	17/41	28/24

^* p < .05.