Association analysis of a highly polymorphic CAG Repeat in the human potassium channel gene KCNN3 and migraine susceptibility.

However for chi-square clumped 2×2 table analysis (obtained by clumping the columns of the original table to maximise the chi-squared value) [ 28 ], between migraine and controls, slightly significant differences were detected within the test data (T4 = 13.001, P = 0.037) (Figure 1 ).

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