Table 6.

Renal length vs. age in Saudi Arabian, Hong Kong Chinese, Australian and American children.

	Saudi Arabia		Hong Konga		Australia		Americanb
	No. of children	Mean renal length (cm)	No. of children	Mean renal length (cm)	No. of children	Mean renal length (cm)	No. of children	Mean renal length (cm)
0–4 months	77	4.9	21	5.0	27	5.1	32	5.2
4–8 months	31	5.8	22	5.7	24	5.5	10	6.2
8–12 months	35	6.0	11	6.3	17	5.7	4	6.2
1–2 years	83	6.4	16	6.3	57	6.2	14	6.7
2–3 years	76	6.8	10	6.7	62	6.8	6	7.4
3–4 years	84	7.2	14	7.2	57	7.2	15	7.4
4–5 years	67	7.4	9	7.4	67	7.4	13	7.9
5–6 years	68	7.7	13	8.0	55	7.8	15	8.1
6–7 years	70	8.1	8	7.7	34	8.0	7	7.8
7–8 years	63	8.2	16	8.0	30	8.3	9	8.3
8–9 years	50	8.6	11	8.4	31	8.6	9	8.9
9–10 years	63	8.8	17	8.8	24	8.7	7	9.2
10–11 years	51	8.8	10	9.1	24	9.0	14	9.2
11–12 years	49	9.4	10	9.4	22	9.5	11	9.6
12–13 years	46	9.5	7	9.2	19	9.5	9	10.4
13–14 years	37	9.8	19	9.6	4	10.1	7	9.8
Total	950		214		554		182

^aThe Hong Kong study involved 250 children (214 ≤14 years).

^bThe American study involved 203 children (182≤14 years). Ages older than 14 years were excluded in this comparison.