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Table 1 Baseline socio-demographic characteristics of the subjects in the Taiwan Birth Panel Study

From: The Taiwan Birth Panel Study: a prospective cohort study for environmentally- related child health

Characteristics, N (%)

TBPS study

Population-based survey

Total

486

21,248

Mother's characteristics

  

Maternal age (%)

  

   <25 years

9.9

22.3

   25-29 years

26.7

37.4

   30-34 years

40.9

29.4

   ≥35 years

22.4

10.8

Maternal education (%)

  

   Junior high school and below

9.3

14.8

   Senior high school

46.3

39.9

   College and above

44.4

45.3

Ethnic origin

  

   Taiwanese

91.8

86.6

   Foreign-born

8.2

13.4

Parity (%)

  

   Primipara

47.3

50.4

   Multipara

52.7

46.6

Family characteristics

  

Marital status (%)

  

   Married

97.5

97.1

   Unmarried

2.5

2.8

Annual family income (%, NT$)

  

   < 600,000

27.6

41.7

   600,000-1,000,000

32.5

36.6

   1,000,000-1,500,000

24.5

14.5

   ≥ 1,500,000

15.4

7.2

Infant's characteristics

  

Plurality (%)

  

   Singleton

98.8

97.4

   Twin

1.2

2.6

Infant gender (%)

  

   Male

50.8

52.5

   Female

49.2

47.5

Birth outcomes

  

   Gestational age (week, mean ± SD)

38.5 ± 1.7

38.4 ± 1.6

   Birth weight (g, mean ± SD)

3157.9 ± 476.6

3104.2 ± 448.1