GSTM1 and parotitis: The clinical parameters that significantly distinguished PA from parotitis were a subacute duration of symptoms (p = 0.016, OR(95%CI) = 1.819(0.881–8.153)), fluctuation of the parotid gland (p < 0.001) and normal Hb levels >12–13 g/dL (p = 0.035, OR(95%CI) = 3.835(1.102–13.274)), while multivariate analysis did not reveal any significant parameters.