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  • Title: Temporal case clustering in pityriasis rosea: a regression analysis on 1379 patients in Minnesota, kuwait, and diyarbakir, Turkey.
    Author: Chuh AA, Molinari N, Sciallis G, Harman M, Akdeniz S, Nanda A.
    Journal: Arch Dermatol; 2005 Jun; 141(6):767-71. PubMed ID: 15967925.
    Abstract:
    OBJECTIVE: To detect temporal case clustering in patients with pityriasis rosea in different geographic locations. DESIGN: Regression analysis of dates on which 1379 patients were diagnosed as having pityriasis rosea in 3 different geographic locations. The control data consisted of dates of diagnosis of patients with psoriasis in the same settings. SETTING: Dermatology clinics in Kuwait, Minnesota, and Diyarbakir, Turkey.Patients Patients with pityriasis rosea and psoriasis seeking care in the clinics. RESULTS: Three significant positive clusters (P = .005, P =.001, and P =.01, respectively) and 1 significant negative cluster (P<.001) were detected in these series of patients. No cluster was detected in 2 corresponding series of patients with psoriasis in Kuwait and Turkey. CONCLUSION: Temporal case clustering exists in pityriasis rosea.
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