Table 1.
Characteristics of study population according to estimated fetal growth
| 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 |