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Trends in the results of patch testing to standard allergens over the period 1984–1995

Materials and Methods From 1984 to 1995, 4567 patients (2208 male and 2359 female) with suspected contact dermatitis were patch tested in our Department with the European standard series. Allergens were supplied by Hermal (Trolab) and applied using Finn Chambers (Epitest) fixed to the upper back by Scanpor tape (Norgesplaster). Patches were removed after 2 days and read at 2 and 4 days. They were scored by a staff dermatologist in accordance with ICDRG guidelines. The data were analysed statistically by spss 6.1 statistical package. The y2 test for trend was used to evaluate any linear relationship between the observed proportions. If a two-sided p-value was less