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Table 1 Baseline characteristics of the first wave and the subsequent follow-ups, LSAC study, 2004–2018

From: Association of infant and child health characteristics with the hazard of any medical condition or disability in Australian children

 

Baseline

Subsequent follow-ups

Baseline characteristics of dropped-out subjects

Wave 1, 2004

(n = 5107)

Wave 2, 2006

(n = 4606)

Wave 3, 2008

(n = 4386)

Wave 4, 2010

(n = 4242)

Wave 5, 2012

(n = 4085)

Wave 6, 2014

(n = 3764)

Wave 7, 2016

(n = 3381)

Wave 8, 2018

(n = 3127)

Dropouts/Loss to follow-up

(W2-W8, n = 1980)

Baseline characteristics

Percent

Percent

Percent

Percent

Percent

Percent

Percent

Percent

Percent

Sex

 Female

48.93

49.00

48.68

48.44

48.69

48.75

48.71

48.64

49.39

 Male

51.07

51.00

51.32

51.56

51.31

51.25

51.29

51.36

50.61

Birthweight

 Low (< 2500 grams)

5.76

5.25

5.40

5.45

5.26

5.34

5.41

5.15

6.72

 Normal (2500-4000 grams)

81.44

81.44

81.3

81.19

80.95

80.9

80.83

80.84

82.37

 High (>4000 grams)

12.81

13.31

13.29

13.37

13.78

13.76

13.75

14.01

10.91

Weight percentile status

 Underweight, < 15%

6.17

5.19

6.16

4.95

4.68

6.22

6.15

5.24

6.77

 Normal weight, 15%-85%

79.05

70.67

69.97

74.3

71.06

65.75

64.21

62.49

80.51

 Overweight, 85%-95%

8.44

17.85

17.01

13.79

16.03

17.48

18.07

19.06

7.07

 Obese, > 95%

5.64

4.47

5.45

5.52

6.10

5.47

5.29

6.81

4.55

 Missing

0.70

1.82

1.41

1.44

2.13

5.07

6.27

6.40

1.11

Gestational age

 Premature birth, < 37 weeks

6.57

6.39

6.44

6.35

6.28

6.28

6.07

5.86

7.70

 On time birth, 37–42 weeks

88.86

89.1

89.16

89.07

89.19

89.2

89.63

89.31

88.15

 Late birth, 42 + weeks

4.57

4.50

4.41

4.58

4.54

4.52

4.30

4.84

4.15

After birth emergency

 No emergency

83.14

83.41

83.68

83.57

83.94

83.53

83.82

83.63

82.37

 Ventilation/Intensive Care Unit required

16.86

16.59

16.32

16.43

16.06

16.47

16.18

16.37

17.63

Age of mothers at birth

  <  = 18 years

1.17

0.89

0.87

0.73

0.66

0.50

0.41

0.35

2.47

 19–34 years

72.41

71.69

71.34

71.52

71.14

70.75

70.10

69.84

76.46

  >  = 35 years

26.41

27.42

27.79

27.75

28.2

28.75

29.49

29.80

21.06

Have both parents

 Yes

90.54

89.58

88.42

87.08

85.78

84.56

82.17

81.74

84.09

Maternal education

  < 12 years of education

31.72

30.37

29.72

29.64

29.14

27.82

26.74

26.12

40.60

 12 years of education

25.60

25.39

25.11

24.64

24.48

24.39

23.84

23.82

28.43

 Graduate/Diploma

35.59

36.72

37.59

38.12

38.59

39.73

40.85

41.20

26.71

 University Masters

7.08

7.52

7.58

7.60

7.79

8.06

8.56

4.87

4.26

Remoteness of residence

 Highly accessible

55.46

55.63

55.29

55.15

54.64

55.03

54.67

55.19

55.89

 Accessible

23.53

23.57

23.82

23.69

24.36

23.87

24.16

23.88

22.98

 Moderately accessible

16.64

16.49

16.63

16.97

16.79

16.97

17.02

16.58

16.73

 Remote/very remote

4.38

4.30

4.26

4.19

4.21

4.13

4.16

4.36

4.40