Table 2. 20-m SRT (number of completed stages/minutes) centiles by age and sex for 69,960 Chinese children and youth aged 9–17 years.

	Age(yr)	P5	P10	P20	P30	P40	P50	P60	P70	P80	P90	P95
Boy	9	1.54	1.85	2.26	2.59	2.88	3.18	3.48	3.83	4.25	4.88	5.43
	10	1.72	2.07	2.53	2.90	3.23	3.56	3.90	4.29	4.76	5.46	6.08
	11	1.93	2.32	2.83	3.24	3.61	3.97	4.35	4.78	5.31	6.08	6.77
	12	2.16	2.59	3.16	3.61	4.02	4.42	4.85	5.32	5.90	6.76	7.52
	13	2.40	2.87	3.50	3.99	4.44	4.88	5.34	5.86	6.50	7.44	8.27
	14	2.61	3.12	3.80	4.33	4.81	5.29	5.78	6.34	7.02	8.04	8.92
	15	2.79	3.33	4.04	4.60	5.11	5.61	6.13	6.71	7.43	8.50	9.43
	16	2.93	3.48	4.22	4.80	5.32	5.84	6.38	6.98	7.73	8.82	9.78
	17	3.03	3.60	4.36	4.95	5.48	6.01	6.56	7.17	7.93	9.05	10.02
Girls	9	1.59	1.86	2.21	2.50	2.76	3.02	3.29	3.61	4.00	4.59	5.12
	10	1.75	2.04	2.43	2.74	3.03	3.31	3.61	3.96	4.39	5.03	5.61
	11	1.90	2.21	2.63	2.97	3.27	3.58	3.90	4.27	4.73	5.42	6.04
	12	2.04	2.37	2.81	3.17	3.49	3.81	4.16	4.54	5.03	5.76	6.41
	13	2.16	2.50	2.97	3.33	3.67	4.01	4.36	4.76	5.27	6.02	6.70
	14	2.25	2.61	3.08	3.46	3.80	4.15	4.51	4.92	5.43	6.20	6.89
	15	2.32	2.68	3.16	3.54	3.89	4.24	4.61	5.02	5.54	6.31	7.01
	16	2.37	2.73	3.22	3.60	3.95	4.30	4.67	5.08	5.60	6.38	7.07
	17	2.40	2.76	3.25	3.63	3.99	4.34	4.71	5.13	5.65	6.43	7.13