Table 3.

 R wave amplitude (mV) for males and females in leads V1 and V6 taken from the tables of Rijnbeek

	Males median (98th centile)		Females median (98th centile)
	V1	V6	V1	V6
0–1 month	1.1 (2.05)	1.0 (1.78)	1.35 (2.2)	0.93 (1.64)
1–3 months	1.23 (2.07)	1.55 (2.23)	1.17 (1.99)	1.51 (2.67)
3–6 months	1.32 (2.20)	1.65 (2.73)	1.14 (2.04)	1.6 (2.8)
6–12 months	1.12 (2.14)	1.7 (2.79)	1.01 (1.92	1.68 (2.74)
1–3 years	1.08 (2.11)	1.79 (2.96)	1.01 (1.91)	1.68 (2.67)
3–5 years	0.95 (1.78)	1.98 (3.14)	0.77 (1.38)	1.89 (2.91)
5–8 years	0.63 (1.48)	1.97 (2.98)	0.55 (1.24)	2.05 (3.25)
8–12 years	0.54 (1.14)	2.18 (3.24)	0.49 (1.14)	2.0 (3.04)
12–16 years	0.48 (1.18)	2.02 (3.05)	0.35 (1.10)	1.65 (2.52)

In the 12–16 year age group the 95% confidence intervals of the centiles for boys and girls do not overlap.