DZ Con. Year pairs rate pairs rate Slater '33 UK 4/8 0.50 7/30 0.24 Kallman'54 USA 25/27 9.93 13/55 0.24 Dofonseca'5? UK 15/21 0.71 15/39 0.38 Bartelien etal.,'75 Denmark 32/55 0.58 9/52 0.17 The concordance rate varies from 0.50 to 0.99 in MZ pairs while for DZ pairs it is 0.17 to 0.38; Both are signifi- cant and the difference between them is highly significant, pointing to confirma- tion of heriditary etiology.
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