Table 1.

The levels of total triiodothyronine (TT3), total tetraiodothyronine (TT4) and thyrotropic-stimulating hormone (TSH) in sera from patients with hypothyroidism, subclinical hypothyroidism and euthyroidism.

Group	n	TSH (uIU/ml)	TT3 (nmol/l)	TT4 (nmol/l)
H	66	79·5 ± 50·8*,**	1·1 ± 0·6*,**	33·4 ± 25·9*,**
sH	60	12·2 ± 5·9	1·9 ± 0·6	85·9 ± 22·4
E	42	2·6 ± 1·3	1·8 ± 0·2	100·4 ± 15·5

^*P < 0·001 compared with E

^**P < 0·001 compared with sH. H, hypothyroidism; sH, subclinical hypothyroidism; E, euthyroidism. Reference value range: TT3: 0·92–2·79 nmol/l; TT4: 58·1–140·6 nmol/l; TSH: 0·35–5·5 uIU/ml.