Supplementary Material for: Idiopathic Generalized Exfoliative Dermatitis and Association with Antihypertensive Drugs and Statins: A Retrospective Case-Control Study

Background/Aims: We aim to examine the hypothesis that antihypertensive drugs and statins may be responsible for the development of idiopathic generalized exfoliative dermatitis (GED) with a case-control study. Methods: All inpatients who were hospitalized under the dermatology service at the Tan Tock Seng Hospital, Singapore, between 1 May 2013 and 31 May 2015, were analysed. Idiopathic GED cases had consistent clinical and histological features but no apparent cause despite comprehensive evaluation. Controls were randomly selected from inpatients with other dermatological conditions in a 1: 1 ratio during the same period. Their relationship was analysed using univariate (χ2 or Fisher exact tests) and multivariate logistic regression analysis. Results: There were 78 cases and 83 controls. Of the 78 cases, 42 patients had a history of treatment with antihypertensive drugs or statins. Cases were not found to be more likely on angiotensin-converting enzyme inhibitors, angiotensin receptor blockers, β-blockers, calcium channel blockers, thiazides or statins compared to controls (OR: 0.81; 95% CI: 0.43–1.51; p = 0.507). Conclusions: There was insufficient evidence to suggest a significant relationship between the chronic use of antihypertensive drugs or statins and idiopathic GED in this study, despite previous evidence reporting this might be so. Further case-control studies with larger sample sizes are needed to evaluate this association.