From: Birth order is associated with caries development in young children: a register-based cohort study
n | % | |
---|---|---|
Gender | ||
Boy | 33,423 | 51.2 |
Girl | 31,836 | 48.8 |
Birth order | ||
First-born | 30,524 | 46.8 |
Second-born | 23,488 | 36.0 |
Third-born | 8250 | 12.6 |
Fourth-born | 2063 | 3.2 |
Fifth- or later-born | 934 | 1.4 |
Maternal country of birth | ||
Sweden | 50,110 | 76.8 |
Abroad | 15,146 | 23.2 |
Paternal country of birth | ||
Sweden | 49,042 | 75.5 |
Abroad | 15,909 | 24.5 |
Maternal education | ||
≤ 9 years | 5593 | 8.6 |
10–12 years | 25,603 | 39.2 |
≥ 13 years | 34,063 | 52.2 |
Family situation | ||
Cohabiting | 62,298 | 95.5 |
Single | 2961 | 4.5 |
Family income | ||
First quintile (highest income) | 13,427 | 20.7 |
Second quintile | 13,303 | 20.5 |
Third quintile | 13,204 | 20.3 |
Fourth quintile | 12,810 | 19.7 |
Fifth quintile (lowest income) | 12,168 | 18.7 |
Social welfare allowance | ||
No | 63,051 | 97.1 |
Yes | 1861 | 2.9 |
Maternal smoking in early pregnancy | ||
No | 55,352 | 84.8 |
Daily | 3616 | 5.6 |
Missing | 6291 | 9.6 |
Maternal BMI in early pregnancy | ||
< 25.00 | 45,490 | 69.7 |
25.00–29.99 | 10,474 | 16.0 |
≥ 30.00 | 3789 | 5.8 |
Missing | 5506 | 8.5 |
Maternal age at delivery | ||
25–34 years | 43,138 | 66.1 |
< 25 years | 6561 | 10.1 |
≥ 35 years | 15,560 | 23.8 |