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Table 1 Child and family characteristics

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

 25.0029.99

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