Table 2

Individual age group breakdown

Age groupnMean weight (kg)Mean weight differences for weight = 2(age+4)(current formula)Mean weight differences for weight = 3(age)+7
All mean weight differences are percentages. Figures in brackets represent 95% confidence intervals (95% CI). A negative sign implies a mean weight overestimate by the formula. If no sign is present, value represents a mean weight underestimate by the formula.
1307211.1511.47 (10.87 to 12.07)11.47 (10.87 to 12.07)
2211613.7214.36 (13.64 to 15.08)5.56 (4.90 to 6.23)
3160016.0914.92 (14.10 to 15.75)0.56 (−0.17 to 1.28)
4121218.6116.28 (15.19 to 17.38)−2.08 (−3.00 to −1.16)
5101020.8615.91 (14.63 to 17.19)−5.17 (−6.21 to −4.12)
696523.7318.63 (17.20 to 20.06)−5.10 (−6.24 to −3.96)
791826.8822.20 (20.53 to 23.87)−3.99 (−5.30 to −2.67)
897430.5727.39 (25.77 to 29.01)−1.37 (−2.63 to −0.12)
9101434.2431.69 (29.91 to 33.47)0.71 (−0.65 to 2.07)
10110738.2636.65 (34.87 to 38.43)3.41 (2.07 to 4.76)
Overall means18.80 (18.42 to 19.18)2.48 (2.17 to 2.79)