Table 3

Accuracy of weight estimation methods

		Bland-Altman analysis		Percentage of estimates lying within x% of actual weight
Age (years)	n	Bias (%)	LOA (%)	Within 10%	Within 20%	Within 30%
Method A
All ages	9019	0.9	−25.9 to 27.6	58.6	86.8	95.4
1–5.9	1169	11.2	−23.1 to 45.4	37.2	63.7	78.8
6–10.9	961	2.5	−32.5 to 37.4	38.6	70.3	90.2
11–15.9	843	−2.3	−27 to 22.4	63.0	90.7	98.0
16+	6046	−1	−22.5 to 20.6	65.2	93.3	99.0
Method B
All ages	9019	0.8	−25.4 to 27.1	60.3	87.7	95.4
1–5.9	1169	11.3	−22.8 to 45.5	36.9	62.4	78.0
6–10.9	961	2.6	−32.1 to 37.4	38.9	71.1	89.4
11–15.9	843	−2.3	−27.1 to 22.5	65.0	90.5	98.0
16+	6046	−1	−21.6 to 19.5	67.5	94.9	99.3
Method C
All ages	9022	0.4	−28.4 to 29.3	57.7	85.8	94.7
1–5.9	1169	6	−44.5 to 56.5	29.7	53.9	72.8
6–10.9	961	4.4	−28.3 to 37.1	42.4	71.9	90.5
11–15.9	843	−2.5	−25.7 to 20.7	63.1	91.9	98.6
16+	6049	−0.8	−22.4 to 20.7	64.8	93.4	99.1
Method D
All ages	9022	1.3	−29.5 to 32.1	56.6	84.7	94.1
1–5.9	1169	0.8	−57.4 to 59	28.5	54.1	71.7
6–10.9	961	4	−31.5 to 39.5	41.2	69.5	88.3
11–15.9	843	−1.2	−25.3 to 23	63.5	91.3	98.5
16+	6049	1.4	−20.4 to 23.1	63.5	92.1	98.7

All results are in percentage and rounded to one decimal place. See text for description of methods A–D. Bland-Altman bias is positive if the method overestimates.
LOA, limits of agreement.