Prevalence of Contact Allergy to p-Phenylenediamine in the European General Population  Thomas L. Diepgen, Luigi Naldi, Magnus Bruze, Simone Cazzaniga, Marie-Louise Schuttelaar, Peter Elsner, Margarida Goncalo, Robert Ofenloch, Åke Svensson  Journal of Investigative Dermatology  Volume 136, Issue 2, Pages 409-415 (February 2016) DOI: 10.1016/j.jid.2015.10.064 Copyright © 2015 The Authors Terms and Conditions

Figure 1 Clinical relevance of positive patch test reactions to p-phenylenediamine in hair coloring products. Algorithm of clinical relevance to contact allergy to PPD in hair coloring products. CI, confidence interval; PR, prevalence rate. Journal of Investigative Dermatology 2016 136, 409-415DOI: (10.1016/j.jid.2015.10.064) Copyright © 2015 The Authors Terms and Conditions