Related Experiment Video
Updated: Aug 7, 2026
A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
Published on: December 9, 2015
Temporal case clustering in pityriasis rosea: a regression analysis on 1379 patients in Minnesota, kuwait, and
Antonio A T Chuh1, Nicolas Molinari, Gabriel Sciallis
1Department of Medicine, University of Hong Kong and Queen Mary Hospital, Pokfulam, Hong Kong. achuh@iohk.com
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.