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调查分析了上海市四所妇婴保健院和上海市虹口区、杨浦区的3,700名双生儿的出生性比,主要是关于母亲年龄和出生胎序对双生儿出生性比的影响.r×2表独立性测验和相关分析结果证明,母亲年龄对双生儿出生性比没有影响(X_([26])~2=29.27,P?.30;r=.4068);但是出生胎序则与双生儿的出生性比密切相关(X_([8])~2=18.10,P?.02;r=.7607).进一步分析了出生胎序和双生儿出生性比的关系,发现双生儿出生性比随着出生胎序的增加而缓缓上升.回归系数是,b=.0108(P<.02);回归方程是,Y=.0108X+.4709.
The survey analyzed the birth rate of 3,700 twins in four maternal and child health centers in Shanghai and Hongkou District in Shanghai and Yangpu District, mainly on the impact of mother’s age and birth order on the birth sex ratio of twins. Table independence test and correlation analysis showed that the mother’s age had no effect on the birth rate of twins (X _ ([26]) ~ 2 = 29.27, P ~ .30; r = .4068) The birth rate was closely related to the birth rate (X_ ([8]) ~ 2 = 18.10, P · .02; r = .7607) .Further analysis of the relationship between birth and twin birth rate, Which increased slowly with the increase of the birth order.The regression coefficient was, b = .0108 (P <.02); The regression equation was Y = .0108X + .4709.