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Table 1 Characteristics of study population according to estimated fetal growth

From: Birth weight, gestational age, fetal growth and childhood asthma hospitalization

Characteristics N SGA AGA LGA
Gestational age     
  22-28 weeks 10,632 21.5 72.5 6.0
  29-32 weeks 31,964 22.0 72.4 5.6
  33-36 weeks 218,432 8.5 85.4 6.1
  37-38 weeks 934,450 3.1 91.3 5.6
  39-41 weeks 4,010,066 2.3 94.7 3.0
  42-45 weeks 450,963 4.4 94.2 1.4
Birth weight     
  <1000 g 7,633 54.3 44.9 0.8
  1000-1499 g 17,555 49.3 50.1 0.6
  1500-1999 g 36,768 45.9 53.7 0.4
  2000-2499 g 123,725 42.2 57.5 0.3
  2500-2999 g 598,400 13.5 86.3 0.2
  3000-3499 g 1,828,077 0.3 99.5 0.2
  3500-3999 g 1,995,356 0 99.2 0.8
  4000-4499 g 855,601 0 91.8 8.2
  4500-4999 g 170,630 0 50.7 49.3
  ≥5000 g 22,762 0 4.1 95.9
Country of residence     
  Denmark 1,538,093 3.5 93.0 3.5
  Sweden 3,067,670 3.0 93.8 3.2
  Finland 1,050,744 2.2 93.6 4.2
Maternal age at delivery     
  15-26 years 2,089,571 3.4 94.1 2.5
  27-30 years 1,604,838 2.7 93.9 3.4
  ≥31 years 1,961,791 2.7 92.7 4.6
  Unknown 307 5.9 91.2 2.9
Maternal social status     
  Not in labor market 836,704 3.3 93.3 3.4
  Unskilled workers 1,131,613 3.0 93.5 3.5
  Skilled workers and white collar workers 1,591,435 2.8 93.7 3.5
  Top level status 778,580 2.8 93.6 3.6
  Unknown 1,318,175 3.0 93.5 3.5
Parity     
  1 2,332,141 4.1 93.9 2.0
  2 2,018,981 2.2 93.9 3.9
  ≥3 1,305,385 2.2 92.3 5.5
Mode of delivery     
  Delivered vaginally 5,020,529 2.5 94.3 3.2
  Delivered by cesarean section 635,077 6.7 87.4 5.9
  Unknown 901 3.6 92.2 4.2
Sex of the child     
  Boy 2,902,138 2.9 93.5 3.6
  Girl 2,754,369 3.0 93.6 3.4
Calendar year of birth     
  1973-1977 493,193 4.5 93.0 2.5
  1978-1982 629,589 3.8 93.6 2.6
  1983-1987 777,959 3.3 93.7 3.0
  1988-1992 1,178,159 2.8 93.6 3.6
  1993-1997 1,106,229 2.5 93.5 4.0
  1998-2002 995,480 2.5 93.6 3.9
  2003-2005 475,898 2.4 93.7 3.9
Family history of asthma     
  Yes 416,278 3.7 92.8 3.5
  No 5,240,229 2.9 93.6 3.5