Table 1 Characteristics of study population, infants n = 945,437, mothers n = 932,684, 2016–2022

Total mothers

134,787

136,507

136,634

133,508

129,448

132,210

129,590

Maternal characteristics

 Age (years) %

 < 20

1.8

1.8

1.7

1.5

1.5

1.3

1.3

20–24

19.6

19.5

19.3

19.2

19.1

18.4

18.7

25–29

30.3

30.1

30.1

30.1

30.0

29.9

29.7

30–34

28.3

28.6

28.3

28.1

28.1

29.1

28.7

35–39

15.4

15.4

15.8

16.1

16.1

16.6

16.5

40 + 

4.7

4.7

4.8

4.9

4.8

4.8

5.2

Population group

Religious and Secular

59.6

59.1

58.6

58.0

57.7

57.6

56.1

Ultra- Orthodox

24.0

24.0

24.9

25.4

25.6

25.7

26.4

Arab

16.4

16.9

16.5

16.6

16.7

16.7

17.5

Residence

Urban

55.6

54.9

55.0

54.4

54.3

53.7

53.0

Suburban

29.7

30.0

30.1

30.3

30.5

31.0

31.1

Rural

14.8

15.1

14.9

15.3

15.2

15.2

15.9

Primapara

32.4

31.9

31.3

31.2

30.9

29.9

31.4

Length of time between pregnancies

 < one year

1.2

1.2

1.3

1.3

1.2

1.2

1.3

1–2 years

21.6

21.7

21.9

22.1

22.0

21.6

20.9

 > 2 years

44.8

45.2

45.5

45.4

45.9

47.3

46.4

Infant characteristics

Total infants

136,858

138,578

138,529

135,363

130,969

133,911

131,229

Birthweight in grams

 < 1500

0.8

0.7

0.7

0.7

0.6

0.7

0.6

1500–2499

6.8

6.9

6.6

6.6

6.0

6.3

6.5

2500–4000

87.6

87.3

87.6

87.7

88.1

88.0

88.1

 > 4000

4.8

5.1

5.1

5.0

5.3

5.0

4.7

Gestational age (weeks)

 < 32

0.7

0.7

0.7

0.7

0.7

0.7

0.7

32–35

3.1

3.1

3.1

3.1

2.6

2.9

2.8

36–37

9.7

9.4

10.4

10.5

10.1

10.7

10.9

 > 37

86.5

86.8

85.9

85.7

86.6

85.6

85.6

Twins

4.1

4.2

4.0

4.0

3.3

3.5

3.5