2019,Vital statistics of Japan,, Volume 1 Natality Table 4.27 Live births,percent distribution and mean birth weight by sex,plurality of birth and birth weight (500 g groups): Japan,2019 Note: 1) The percent distribution is for the number of live births excluding data with unspecified birth weight.    2) As birth weight was considered in 100 gram units until 1991,0.05kg was added to the calculated mean weight.      However,the survey form was revised in 1992 and the arithmetic mean value considered in 100 gram units is being used since then. ,,Number,,,Percentage,, ,,Total,Single delivery,Plural delivery,Total,Single delivery,Plural delivery Total,Total,865239,847837,17402,100.0,100.0,100.0 ,Under 1.0kg,2646,2172,474,0.3,0.3,2.7 ,1.0〜1.5kg,3821,2879,942,0.4,0.3,5.4 ,1.5〜2.0kg,10368,7441,2927,1.2,0.9,16.8 ,2.0〜2.5kg,64627,56548,8079,7.5,6.7,46.4 ,2.5〜3.0kg,333137,328549,4588,38.5,38.8,26.4 ,3.0〜3.5kg,358434,358066,368,41.4,42.2,2.1 ,3.5〜4.0kg,85313,85295,18,9.9,10.1,0.1 ,4.0〜4.5kg,6479,6479,-,0.7,0.8,- ,4.5kg and over,291,289,2,0.0,0.0,0.0 ,Not stated,123,119,4,    ・,    ・,    ・ ,(Regrouped)1.0kg and over,862470,845546,16924,99.7,99.7,97.3 ,(Regrouped)Under 2.5kg,81462,69040,12422,9.4,8.1,71.4 ,Mean weight,3.00,3.02,2.22,    ・,    ・,    ・ Male,Total,443430,434671,8759,100.0,100.0,100.0 ,Under 1.0kg,1287,1061,226,0.3,0.2,2.6 ,1.0〜1.5kg,1963,1515,448,0.4,0.3,5.1 ,1.5〜2.0kg,5112,3741,1371,1.2,0.9,15.7 ,2.0〜2.5kg,28466,24678,3788,6.4,5.7,43.3 ,2.5〜3.0kg,154664,152004,2660,34.9,35.0,30.4 ,3.0〜3.5kg,194674,194425,249,43.9,44.7,2.8 ,3.5〜4.0kg,52739,52726,13,11.9,12.1,0.1 ,4.0〜4.5kg,4259,4259,-,1.0,1.0,- ,4.5kg and over,196,194,2,0.0,0.0,0.0 ,Not stated,70,68,2,    ・,    ・,    ・ ,(Regrouped)1.0kg and over,442073,433542,8531,99.7,99.8,97.4 ,(Regrouped)Under 2.5kg,36828,30995,5833,8.3,7.1,66.6 ,Mean weight,3.05,3.06,2.26,    ・,    ・,    ・ Female,Total,421809,413166,8643,100.0,100.0,100.0 ,Under 1.0kg,1359,1111,248,0.3,0.3,2.9 ,1.0〜1.5kg,1858,1364,494,0.4,0.3,5.7 ,1.5〜2.0kg,5256,3700,1556,1.2,0.9,18.0 ,2.0〜2.5kg,36161,31870,4291,8.6,7.7,49.7 ,2.5〜3.0kg,178473,176545,1928,42.3,42.7,22.3 ,3.0〜3.5kg,163760,163641,119,38.8,39.6,1.4 ,3.5〜4.0kg,32574,32569,5,7.7,7.9,0.1 ,4.0〜4.5kg,2220,2220,-,0.5,0.5,- ,4.5kg and over,95,95,-,0.0,0.0,- ,Not stated,53,51,2,    ・,    ・,    ・ ,(Regrouped)1.0kg and over,420397,412004,8393,99.7,99.7,97.1 ,(Regrouped)Under 2.5kg,44634,38045,6589,10.6,9.2,76.3 ,Mean weight,2.96,2.98,2.18,    ・,    ・,    ・