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Table 2 gestational age and birthweight of twins according to variables

From: Reference birthweight range for multiple birth neonates in Japan

gestational age no. of cases mean (weeks) standard deviation (weeks) significance of difference
total 64464 37.2 2.7  
male 32211 37.2 2.6 ***
female 32253 37.3 2.6  
primipara 29106 37.1 2.8 ***
multipara 35358 37.3 2.6  
like-sexed male 25510 37.1 2.7 ***
like-sexed female 25552 37.3 2.7  
unlike-sexed 13402 37.4 2.6  
birthweight no. of cases mean (kg) standard deviation (kg)  
total 64447 2.39 0.51  
male 32202 2.43 0.51 ***
female 32245 2.36 0.50  
primipara 29098 2.31 0.50 ***
multipara 35349 2.46 0.50  
1st twins 32156 2.42 0.50 ***
2nd twins 32153 2.36 0.51  
like-sexed male 25501 2.41 0.52 ***
like-sexed female 25545 2.35 0.50  
unlike-sexed male 6701 2.49 0.50  
unlike-sexed female 6700 2.39 0.48  
  1. *** p < 0.001