2020,Vital statistics of Japan,, Volume 2 Infant mortality Table 7 Infant deaths (under 1 year) from diseasesCbirth weight (500g groups) and mean birth weight by sex and period of gestation (4-week divisionsCearly-normal-mature relisted):JapanC2020 Sex and period of gestation,,Total,Under 0.5kg,0.5kg and overCless than 1.0kg,1.0-1.5,1.5-2.0,2.0-2.5,2.5-3.0,3.0-3.5,3.5-4.0,4.0-4.5,4.5kg and over,Unspecified,Mean birth weight Total,Total,1415,118,211,137,179,216,322,181,37,3,4,7,1.99 ,Under 22 completed weeks,7,7,-,-,-,-,-,-,-,-,-,-,0.34 ,22-23 completed weeks,151,71,79,-,1,-,-,-,-,-,-,-,0.52 ,24-27,143,30,97,8,7,1,-,-,-,-,-,-,0.73 ,28-31,118,10,24,43,25,8,5,3,-,-,-,-,1.37 ,32-35,192,-,7,55,50,49,22,7,1,-,1,-,1.89 ,36-39,611,-,1,29,89,132,234,109,14,1,2,-,2.55 ,40 completed weeks and over,180,-,-,2,7,26,60,61,21,2,1,-,2.93 ,Unspecified,13,-,3,-,-,-,1,1,1,-,-,7,1.92 (Regrouped),Pre-term (Under 37 completed weeks),692,118,208,115,97,84,50,16,2,-,2,-,1.30 , Under 22 completed weeks,7,7,-,-,-,-,-,-,-,-,-,-,0.34 , 22-27 completed weeks,294,101,176,8,8,1,-,-,-,-,-,-,0.62 , 28-31,118,10,24,43,25,8,5,3,-,-,-,-,1.37 , 32-36,273,-,8,64,64,75,45,13,2,-,2,-,2.02 ,Term (37-41),707,-,-,22,81,132,270,163,34,3,2,-,2.67 ,Post-term (42 completed weeks and over),3,-,-,-,1,-,1,1,-,-,-,-,2.59 Male,Total,745,55,125,59,87,104,184,102,23,3,1,2,2.03 ,Under 22 completed weeks,3,3,-,-,-,-,-,-,-,-,-,-,0.36 ,22-23 completed weeks,82,33,49,-,-,-,-,-,-,-,-,-,0.52 ,24-27,81,16,56,7,2,-,-,-,-,-,-,-,0.71 ,28-31,65,3,15,23,16,4,4,-,-,-,-,-,1.38 ,32-35,115,-,3,23,36,30,17,6,-,-,-,-,1.97 ,36-39,311,-,-,4,30,63,135,64,13,1,1,-,2.69 ,40 completed weeks and over,83,-,-,2,3,7,27,32,10,2,-,-,3.00 ,Unspecified,5,-,2,-,-,-,1,-,-,-,-,2,1.26 (Regrouped),Pre-term (Under 37 completed weeks),385,55,123,53,59,46,36,12,1,-,-,-,1.35 , Under 22 completed weeks,3,3,-,-,-,-,-,-,-,-,-,-,0.36 , 22-27 completed weeks,163,49,105,7,2,-,-,-,-,-,-,-,0.61 , 28-31,65,3,15,23,16,4,4,-,-,-,-,-,1.38 , 32-36,154,-,3,23,41,42,32,12,1,-,-,-,2.13 ,Term (37-41),353,-,-,6,28,58,146,89,22,3,1,-,2.77 ,Post-term (42 completed weeks and over),2,-,-,-,-,-,1,1,-,-,-,-,2.89 Female,Total,670,63,86,78,92,112,138,79,14,-,3,5,1.95 ,Under 22 completed weeks,4,4,-,-,-,-,-,-,-,-,-,-,0.33 ,22-23 completed weeks,69,38,30,-,1,-,-,-,-,-,-,-,0.51 ,24-27,62,14,41,1,5,1,-,-,-,-,-,-,0.76 ,28-31,53,7,9,20,9,4,1,3,-,-,-,-,1.36 ,32-35,77,-,4,32,14,19,5,1,1,-,1,-,1.77 ,36-39,300,-,1,25,59,69,99,45,1,-,1,-,2.40 ,40 completed weeks and over,97,-,-,-,4,19,33,29,11,-,1,-,2.87 ,Unspecified,8,-,1,-,-,-,-,1,1,-,-,5,2.58 (Regrouped),Pre-term (Under 37 completed weeks),307,63,85,62,38,38,14,4,1,-,2,-,1.24 , Under 22 completed weeks,4,4,-,-,-,-,-,-,-,-,-,-,0.33 , 22-27 completed weeks,131,52,71,1,6,1,-,-,-,-,-,-,0.63 , 28-31,53,7,9,20,9,4,1,3,-,-,-,-,1.36 , 32-36,119,-,5,41,23,33,13,1,1,-,2,-,1.88 ,Term (37-41),354,-,-,16,53,74,124,74,12,-,1,-,2.57 ,Post-term (42 completed weeks and over),1,-,-,-,1,-,-,-,-,-,-,-,1.98