Table I.
Polynomial Coefficients, Relative Standard Error, Constant Coefficient, Akaike Information Criterion of the Polynomial Function of the Age-Matched Weight or BMI, and Percent of Simulated Individuals’ Weights or BMI Outside the 90 and 95% Confidence Bands of the CDC and WHO Datasets by Gender and Age Group
| Gender | Polynomial coefficients | AIC | CV% | % outside | |||||
|---|---|---|---|---|---|---|---|---|---|
| x 5 | x 4 | x 3 | x 2 | x 1 | x 0 | ε a | (90% CI, 95% CI) | ||
| Body weight | |||||||||
| Age range 2–20 years, CDC | |||||||||
| Female | 2.09 × 10−4 (2.3%) | −0.01153 (2.1%) | 0.2161 (2.0%) | −1.571 (2.1%) | 6.616 (1.6%) | 4.265 (2.6%) | −597.54 |
ε
age < 5 (12) ε age ≥ 5 (18) |
9.9%, 6.2% |
| Male | 0 | −1.99 × 10−3 (1.7%) | 0.07245 (1.9%) | −0.728 (2.5%) | 4.720 (1.9%) | 5.472 (2.3%) | −437.89 |
ε
age < 5 (11) ε age ≥ 5 (17) |
9.6%, 5.5% |
| Age range 0–2 years, CDC | |||||||||
| Female | 0 | −0.1214 (1.6%) | 1.208 (1.2%) | −4.571 (0.6%) | 9.6 (0.2%) | 3.41 (0.1%) | −377.3 | (12) | 9.7%, 6.0% |
| Male | 0 | −0.1774 (2.3%) | 1.691 (1.5%) | −6.052 (0.8%) | 11.314 (0.3%) | 3.55 (0.2%) | −338.25 | (11) | 9.1%, 5.4% |
| Age range 0–5 years, WHO | |||||||||
| Female | 0.034 (9.7%) | −0.4883 (8.6%) | 2.617 (7.2%) | −6.522 (5.7%) | 9.885 (2.9%) | 3.524 (2.0%) | −331.10 | (12) | 11%, 7% |
| Male | 0.04 (10.7%) | −0.5691 (9.5%) | 3.041 (8.0%) | −7.612 (6.2%) | 11.127 (3.4%) | 3.758 (2.4%) | −294.18 | (11) | 11%, 7% |
| Body mass index | |||||||||
| Age range 2–20 years, CDC | |||||||||
| Female | 0 | 0 | −0.0043 (2.0%) | 0.1609 (0.2%) | −1.3263 (0.3%) | 19.169 (0.4%) | −961.17 |
ε
2 ≤ age < 6 (8) ε 6 ≤ age < 8 (11) ε 8 ≤ age ≤ 20 (17) |
9.5%, 4.6% |
| Male | 0 | 0 | −0.003 (1.9%) | 0.1317 (1.4%) | −1.2002 (1.7%) | 19.332 (0.3%) | −1,003.65 |
ε
2 ≤ age < 6 (6) ε 6 ≤ age < 8 (10) ε 8 ≤ age ≤ 20 (14) |
9.1%, 5.0% |
CV coefficient of variation, CDC Center for Disease Control, WHO World Health Organization, AIC Akaike information criterion, CI confidence interval
aLog-normal distribution assumed