Prevalence of psoriasis in a Norwegian Lapp population.
The occurrence of psoriasis in a Norwegian Lapp population was estimated by reviewing medical records in the local health centre of Kautokeino. Altogether 40 cases of psoriasis were registered in the study population comprising 99.6% of the total population of 2,963 individuals. Thirty-five cases of psoriasis belonged to the Lappish population of 2,508 people, giving a prevalence of 1.4%, with no difference between males and females. Five cases of psoriasis were found in the non-Lappish population of 442 individuals which gives a prevalence of 1.1% with no sex differences. A peak prevalence among Lapps was observed in the age groups 20-39 years (2.7%), equal for both sexes and in females aged 50-59 years (3.2%), whereas a lower prevalence of 0.6% was found in the age group 40-49 years. A seronegative psoriatic arthritis was recorded in 6 of the 35 Lappish compared to none of the non-Lappish cases. A familial association was confirmed in 11 of the 35 Lappish cases, in none of the non-Lappish.
Falk
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Department of Dermatology, University of Tromsø, Norway.
Vandbakk
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D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D015535:Arthritis, Psoriatic / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D005006:Ethnicity; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D009664:Norway / Q000453:epidemiology; D015995:Prevalence; D011565:Psoriasis / Q000453:epidemiology*; D012737:Sex Factors