Journal of Orthopaedic Surgery and Research

Table 6 Phenotypic characteristics of thumb duplication between group A and group B

From: Epidemiological statistics of congenital thumb duplication in the Chinese population

Variables	Total		Aa		Bb		χ²	P
Variables	Number	%	Number	%	Number	%	χ²	P
Sex
Male	2157	60.8	665	61.2	1492	60.6	0.137	0.712
Female	1392	39.2	421	38.8	971	39.4
Laterality
Left	1150	32.4	362	33.3	788	32.0	0.618	0.432
Right	1977	55.7	635	58.5	1342	54.5	4.851	0.028
Bilateral	422	11.9	89	8.2	333	13.5	20.395	<0.001c

^aThumb duplication features of the group A
^bThumb duplication features of the group B
^cSignificant for each group compared with their controls

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ISSN: 1749-799X

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