Table 1.

NK Activity in 18 Patients with Graves’ Disease and in 18 Controls

E : T ratio	Graves’ disease		Controls
	25 : 1	50: 1	25: 1	50 : 1
Control medium	39.8 ± 23.3a)	54.7 ± 20.3	46.0 ± 18.2	59.7 ± 15.6
NT medium	41.2 ± 23.3	58.2 ±21.5	54.0 ± 20.0	69.5 ± 17.7
HT medium	42.5 ± 25.3	57.9 ± 22.5	52.4 ±21.1	68.3 ± 19.7

NT : normal T₄ : HT : high T₄

^a)mean ± SD of NK activity