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调查了宁夏回族８０４人、汉族７２６人的拇指类型，直型拇指出现率回族为８１．７２％，汉族为７７．９６％，回、汉间无显著差异（ｕ＝１．８３，Ｐ＞０．０５）；过伸型拇指出现率回族为１８．２８％，汉族为２２．０４％，均明显低于直型拇指出现率；分析了回族聚居区同心县７６０人（回６５０人，汉１１０人）的拇指类型，直型拇指出现率回族为８２．３１％，汉族为７８．１８％，回、汉间无显著性差异（ｕ＝１．０４，Ｐ＞０．０５），男、女间亦无显著性差异（ｕ＝０．４４，Ｐ＞０．０５）；还计算了显性基因Ａ的频率（回族为０．５７２５，汉族为０．５３０５）和隐性基因ａ的频率（回族为０．４７２５，汉族为０．４６９５）。
The thumb type of 804 Hui nationality and 726 Han nationality were investigated. The rate of straight thumb was 81.72% for Hui and 77.96% for Han. There was no significant difference between Hui and Han (u=1.83, P>0). .05); The rate of occurrence of hyperextensional thumb is 18.28% for Hui and 22.04% for Han, both significantly lower than the rate of straight thumb; 760 people in Huixin County, Tongxin County (return to 650 persons, Han 110) The thumb type, the straight thumb appearance rate of Hui people was 82.31%, the Han nationality was 78.18%, there was no significant difference between Hui and Han (u=1.04, P>0.05), male and female. There was no significant difference between the two groups (u=0.44, P>0.05); the frequencies of the dominant gene A (0.5725 for Hui, 0.5305 for Han) and the frequency of recessive gene a were also calculated ( Hui is 0.4725 and Han is 0.4695).