				5.0-year	5.5-year	6.0-year	6.5-year	Total	χ²	p
Boys	Barefoot group	Formed	n	34	41	53	23	151	7.59	0.01*
			%	77.3	91.1	96.4	92.0	89.3
		Unformed	n	10	4	2	2	18
			%	22.7	8.9	3.6	8.0	10.7
	Non barefoot group	Formed	n	22	39	39	38	138
			%	71.0	78.0	81.3	80.9	78.4
		Unformed	n	9	11	9	9	38
			%	29.0	22.0	18.8	19.1	21.6
Girls	Barefoot group	Formed	n	46	27	42	23	138	0.30	0.58
			%	95.8	87.1	100.0	100.0	95.8
		Unformed	n	2	4	0	0	6
			%	4.2	12.9	0.0	0.0	4.2
	Non barefoot group	Formed	n	45	37	35	37	154
			%	88.2	97.4	100.0	94.9	94.5
		Unformed	n	6	1	0	2	9
			%	11.8	2.6	0.0	5.1	5.5