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Table 1 Number of subjects analyzed from each gestational week

From: Reference birthweight range for multiple birth neonates in Japan

gestational age (weeks) Twins triplets quadruplets
  male female male female male female
24 76 64 14 14 3 1
25 121 111 11 7 5 6
26 105 116 7 11   
27 176 145 14 25 3 7
28 208 196 26 35 13 11
29 211 204 38 40 17 11
30 309 287 33 27 15 12
31 427 325 51 52 13 15
32 673 549 59 54 10 8
33 906 844 109 108 10 7
34 1366 1356 115 123 12 11
35 2306 2122 141 131 3 5
36 4257 4132 143 154 2 2
37 7276 7128 89 96   
38 6963 7343 41 66   
39 4358 4632 16 21   
40 1924 2135   1   
41 456 470     
42 39 39