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Table 1 Basic characteristic of participants by birth cohort (n = 301,744)

From: Breastfeeding duration of different age groups and its associated factors among Chinese women: a cross-sectional study

 

1930–1938 (n = 26,723)

1939–1948 (n = 57,571)

1949–1958 (n = 99,680)

1959–1968 (n = 92,452)

1969–1974 (n = 25,318)

Mean age/years, (SD)

70.5 (2.4)

61.6 (3.1)

52.0 (3.0)

41.8 (2.9)

35.7 (1.4)

Rural residency, %

43.6

53.3

55.5

58.8

60.1

Urban residency, %

56.5

46.7

44.5

41.2

40.0

Highest education, %

 Primary school

85.9

75.0

63.4

34.7

38.5

 Middle school

6.8

14.8

21.7

38.2

36.7

 High school and above

7.3

10.3

14.8

27.1

24.7

Household size, %

 ≤3 people

59.0

50.6

44.8

46.2

44.7

 3–5 people

30.3

34.4

40.0

45.8

46.2

 >5 people

10.7

15.0

15.2

8.1

9.1

BMI at age 25/(kg/m2), (SD)

22.6 (3.2)

22.3 (3.0)

22.0 (2.7)

21.5 (2.5)

21.4 (2.5)

Age at menarche, %

 <15 years old

22.7

19.7

28.9

43.4

58.1

 ≥15 years old

77.3

80.3

71.1

56.6

41.9

Age at menarche/years old, (SD)

16.0 (2.0)

16.3 (2.1)

15.6 (2.0)

14.9 (1.7)

14.3 (1.6)

Oral contraceptive pills use, %

 Never used

94.7

90.3

87.6

90.2

94.6

Age at first birth, %

 ≤21 years old

54.3

45.0

23.9

22.7

24.8

 21–25 years old

30.4

38.4

45.5

59.3

52.8

 ≥25 years old

15.3

16.7

30.6

18.1

22.4

Age at first birth/years old, (SD)

22.0 (3.6)

22.5 (3.4)

24.0 (3.2)

23.5 (2.7)

23.8 (2.9)

Numbers of live births, %

 1

4.4

5.3

36.1

55.9

62.9

 2

8.9

27.8

39.2

32.8

31.3

 >2

86.7

66.9

24.6

11.3

5.8