Table 1. Comparison of height and follow-up rate by sex.

Average age (y)	Boys				Girls				P value for comparison of follow-up ratea
	n	Follow-up rate (%)	Means (cm)	SD	n	Follow-up rate (%)	Means (cm)	SD
6.5	1036		116.11	5.03	948		115.72	4.91
7.5	1034	99.8	122.00	5.30	948	100.0	121.60	5.14	0.50
8.5	1036	100.0	127.63	5.67	946	99.8	127.46	5.59	0.23
9.5	1035	99.9	132.91	5.87	947	99.9	133.54	6.19	1.00
10.5	1030	99.4	138.19	6.35	942	99.4	140.27	6.82	0.88
11.5	1019	98.4	144.28	7.39	924	97.5	146.98	6.72	0.16
12.5	995	96.0	151.66	8.38	885	93.4	152.26	5.89	0.01
13.5	986	95.2	158.68	8.26	891	94.0	155.13	5.39	0.24
14.5	732	70.7	164.38	6.89	677	71.4	156.68	5.28	0.71

^aP values were calculated using the χ² test.