Table 1 Comparison of APLS, Luscome and Owens and new derived formula using Bland-Altman method
From: Is the APLS formula used to calculate weight-for-age applicable to a Trinidadian population?
Age at last birthday (years) | Number of patients | APLS formula | Luscombe and Owens formula | Derived formula | |||
|---|---|---|---|---|---|---|---|
Bias (estimated – measured weight - kg) | 95% Limits of Agreement | Bias (estimated – measured weight - kg) | 95% Limits of Agreement | Bias (estimated – measured weight - kg) | 95% Limits of Agreement | ||
1 | 439 | −0.6 | 3.1 to −4.4 | −0.6 | 3.1 to −4.4 | −0.15 | 3.2 to −4.6 |
2 | 355 | −1.2 | 4.1 to −6.6 | −0.2 | 5.1 to −5.6 | −0.2 | 5.1 to −5.6 |
3 | 318 | −1.2 | 4.3 to −6.7 | −0.8 | 6.3 to −4.7 | −0.3 | 5.2 to −5.8 |
4 | 306 | −2.0 | 5.3 to −9.4 | 1.0 | 8.3 to −6.4 | −0.04 | 7.4 to −7.5 |
5 | 305 | −2.4 | 6.6 to −11.4 | 1.6 | 10.6 to −7.4 | 0.3 | 8.5 to −7.9 |
All ages | 1723 | −1.4 | 5.0 to −7.8 | −0.4 | 6.9 to −6.1 | −0.4 | 6.0 to −6.1 |