Table 2. Correlation coefficients (Spearman) between oestrogen receptor α (ER-α), ER-β serum bioactivity and serum oestradiol.

Sample	ER-α and ER-β serum bioactivity	ER-α serum bioactivity and oestradiol	ER-β serum bioactivity and oestradiol
Total (N=293)	0.08	0.08	0.00
	P=0.15	P=0.18	P=0.98
ER-β serum bioactivity >0 (N=127)	0.18	0.09	0.03
	P=0.05	P=0.30	P=0.74
Oestradiol >12 (N=178)	0.11	0.18	−0.05
	P=0.16	P=0.02	P=0.52
ER-β serum bioactivity >0 and oestradiol >12 (N=79)	0.22	0.18	0.10
	P=0.05	P=0.11	P=0.40