@article {Cattermole390, author = {G N Cattermole and Mia P Y Leung and H-K So and P S K Mak and C A Graham and T H Rainer}, title = {Age-based formulae to estimate children{\textquoteright}s weight in the emergency department}, volume = {28}, number = {5}, pages = {390--396}, year = {2011}, doi = {10.1136/emj.2009.090357}, publisher = {British Association for Accident and Emergency Medicine}, abstract = {Objective To develop an age-based weight estimation rule in a Chinese population and to compare its performance with existing formulae.Design Population-based observational study.Setting Schools and kindergartens in Hong Kong.Subjects Healthy Chinese children aged 1{\textendash}10 years old on their last birthday.Interventions Weight was measured to the nearest 0.2 kg.Main outcome measures Linear regression was used to derive a simple formula relating weight to the child{\textquoteright}s age on his or her last birthday. The accuracy and precision of different age-based weight formulae was compared using coefficient of variation, Bland Altman plots, and by determining the proportion of children with estimates \>30\% outside the actual weight.Results The Chinese Age Weight Rule is a simple linear formula that is more accurate than and at least as precise as any other age-based weight estimation rule: weight in kg=(3{\texttimes}age last birthday)+5. It is accurate and precise in children \<7 years old, but all age-based weight estimates are imprecise in older children.Conclusions The Chinese Age Weight Rule should be used in a Chinese population in preference to any other age-based weight estimation rule. Caution should be taken when using it in older children in whom other weight-estimation tools may be more appropriate.}, issn = {1472-0205}, URL = {https://emj.bmj.com/content/28/5/390}, eprint = {https://emj.bmj.com/content/28/5/390.full.pdf}, journal = {Emergency Medicine Journal} }