Characteristics of the 1998–2010 Québec Longitudinal Study of Child Development birth cohort (n=698)
| Age 6 years | Age 8 years | Age 10 years | Age 12 years | |
|---|---|---|---|---|
| Anthropometric characteristics | ||||
| Age in months, mean (SD) | 73.8 (3.0) | 97.7 (3.0) | 121.7 (3.0) | 145.5 (3.0) |
| Height in cm, mean (SD) | 117.4 (5.2) | 128.9 (5.9) | 142.0 (6.9) | 152.1 (7.5) |
| Weight in kg, mean (SD) | 21.7 (3.4) | 27.4 (5.2) | 37.8 (9.0) | 46.9 (10.8) |
| Body Mass Index (BMI) centile, mean (SD) | 52.1 (30.1) | 51.2 (29.4) | 60.7 (27.8) | 62.1 (27.8) |
| BMI Z-score, mean (SD) | 0.02 (1.2) | −0.01 (1.2) | 0.39 (0.9) | 0.42 (0.9) |
| BMI categories (%) | ||||
| Normal or underweight | 82 | 83 | 75 | 71 |
| Overweight | 11 | 10 | 12 | 17 |
| Obese | 6 | 7 | 13 | 12 |
| Income characteristics | ||||
| Distribution of sample | ||||
| Longitudinal categorisations: trajectories (%) | ||||
| Stable non-poor | 75 | 73 | 72 | 71 |
| Stable poor | 12 | 8 | 9 | 9 |
| Increasing likelihood of poverty | 10 | 10 | 11 | 13 |
| Decreasing likelihood of poverty | 3 | 9 | 8 | 7 |
| Cross-sectional or retrospective categorisations (%) | ||||
| No past history of poverty | 71 | 69 | 68 | 67 |
| Past history of poverty | 29 | 31 | 32 | 33 |
| Currently not poor | 87 | 90 | 90 | 90 |
| Currently poor | 13 | 10 | 10 | 10 |
| Proportion of years spent in poverty | ||||
| Longitudinal categorisations: trajectories (%) | ||||
| Stable non-poor | 0 | 0 | 0 | 0 |
| Stable poor | 79 | 83 | 79 | 77 |
| Increasing likelihood of poverty | 26 | 24 | 23 | 23 |
| Decreasing likelihood of poverty | 38 | 42 | 35 | 33 |
| Cross-sectional or retrospective categorisations (%) | ||||
| No past history of poverty | 0 | 0 | 0 | 0 |
| Past history of poverty | 48 | 42 | 40 | 38 |
| Currently not poor | 0.1 | 0.1 | 0.1 | 0.1 |
| Currently poor | 64 | 63 | 61 | 57 |