Table 1.

The incidence rates of trochlear dysplasia between the unswaddled group and the swaddled group and the sexual difference

	One week				Two weeks
	Unswaddled group (n = 42)	Swaddled group (n = 42)	Chi-square (group difference)	p value	Unswaddled group (n = 42)	Swaddled group (n = 42)	Chi-square (group difference)	p value
Female	0 of 22	8 of 22	9.78	0.004	2 of 22	16 of 22	18.43	< 0.001
Male	0 of 20	6 of 20	7.06	0.02	0 of 20	10 of 20	13.33	< 0.001
Total	0 of 42	14 of 42	16.80	< 0.001	2 of 42	26 of 42	30.86	< 0.001
Chi-square (sexual difference)		0.19			1.91	2.29
p value	＞ 0.99	0.66			0.49	0.13