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A Regression Analysis on 1379 Patients in Minnesota, Kuwait, and Diyarbakir, Turkey

Antonio A. T. Chuh, MD(HK), MRCP(UK), FRCP(Ire), MRCPCH; Nicolas Molinari, PhD; Gabriel Sciallis, MD; Mehmet Harman, MD; Sedat Akdeniz, MD; Arti Nanda, MD, DNBE

Arch Dermatol. 2005;141:767-771.

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.

Author Affiliations: Department of Medicine, University of Hong Kong and Queen Mary Hospital, Pokfulam, Hong Kong (Dr Chuh); Department of Biostatistics, Institut Universitaire de Recherche Clinique, University of Montpellier I, Montpellier, France (Dr Molinari); Department of Dermatology, Mayo Medical School, Mayo Clinic, Rochester, Minn (Dr Sciallis); Department of Dermatology and Venereology, University of Dicle, Diyarbakir, Turkey (Drs Harman and Akdeniz); and Department of Pediatric Dermatology, Asad Al-Hamad Dermatology Center, Al-Sabah Hospital, Kuwait (Dr Nanda).

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