Table 3. Pooled Values of Total Testosterone (nmol/L; five published studies plus the new ALSPAC data reported in this communication).

Age	# Studies	n	Weighted Mean (SD)
6–7	2	123	0.74 (0.15)
8–9	4	556	0.78 (0.08)
10–11	6	944	2.00 (0.46)
12–13	6	1164	8.04 (1.23)
14–15	6	1406	13.58 (1.43)
16–17	6	900	16.72 (1.68)
18–19	4	442	16.84 (1.97)