| 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 |