APOE and Alzheimer disease: Across-domain IIV did not vary with APOE status in HCS [F(1,111) = 0.368; p = 0.545; ηp2 = 0.003], MCI [F(1,27) = 0.227; p = 0.638; ηp2 = 0.008] or AD [F(1,21) = 0.003; p = 0.957; ηp2 = 0.000].