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Prevalence of Graves’ ophthalmopathy in relation to TRAb titres. GO, Graves’ ophthalmopathy; TRAb, thyrotropin receptor antibodies; TRAb titres: Quartiles: <3.5 IU/l, 3.5-12.5 IU/l, 12.5-40 IU/l, >40 IU/l. Prevalence in quartile, P <0.01 (chi-square test).
