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Table 2
Classification of body mass index (BMI) trajectories of boys aged 24 to 35 months at baseline, Canada, 1996/1997 to 2002/2003
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| Average age in months/years (survey year) | Group 1 Stable normal |
Group 2 Transient high |
Group 3 J-curve rise to obesity |
|---|---|---|---|
| 30 months/2.5 years (1996/1997) | Normal BMI (mean BMI = 17.2; 95% confidence interval = 16.7 to 17.8) |
Normal BMI (mean BMI = 18.0; 95% confidence interval = 16.9 to 19.0) |
Overweight (mean BMI = 19.5; 95% confidence interval = 18.0 to 21.0) |
| 53 months/4.4 years (1998/1999) | Normal BMI (mean BMI = 16.4; 95% confidence interval = 15.9 to 16.9) |
Overweight (mean BMI = 18.5; 95% confidence interval = 17.3 to 19.7) |
Normal BMI (mean BMI = 16.2; 95% confidence interval = 14.7 to 17.6) |
| 78 months/6.5 years (2000/2001) | Normal BMI (mean BMI = 15.7; 95% confidence interval = 15.3 to 16.1) |
Obese (mean BMI = 21.5; 95% confidence interval = 20.3 to 22.9) |
Overweight (mean BMI = 17.8; 95% confidence interval = 16.3 to 19.4) |
| 100 months/8.3 years (2002/2003) | Normal BMI (mean BMI = 16.4; 95% confidence interval = 15.9 to 17.0) |
Normal BMI (mean BMI = 17.9; 95% confidence interval = 16.9 to 19.0)) |
Obese (mean BMI = 24.2; 95% confidence interval = 22.4 to 26.1) |
| Note: Based on cut-offs established by Cole, Bellizi and Flegal, specific to child’s age and sex. Source: National Longitudinal Survey of Children and Youth, 1996/1997 to 2002/2003. |
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