Table 4.

The positive percentage of anti-thyroid peroxidase antibody (TPOAb) immunoglobulin G (IgG) subclasses in sera from patients with hypothyroidism, subclinical hypothyroidism and euthyroidism.

Group	n	TPOAb IgG subclasses
		IgG1 (%)		IgG2 (%)		IgG3 (%)		IgG4 (%)
		Median	Interquartile range	Median	Interquartile range	Median	Interquartile range	Median	Interquartile range
H	66	10·60	(3·90–11·5)	5·17*	(3·46–7·33)	2·71	(1·70–4·42)	6·95*	(3·48–12·8)
sH	60	9·32	(3·94–11·9)	4·28*	(2·89–6·93)	2·45	(1·65–3·53)	5·92*	(3·35–10·2)
E	42	8·08	(2·99–11·5)	3·05	(2·27–4·32)	2·61	(1·72–5·94)	3·80	(1·21–11·1)

^*P < 0·05 compared with E.

H, hypothyroidism; sH, subclinical hypothyroidism; E, euthyroidism.