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| - Age-based formulae to estimate children's weight in the emergency department
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| - 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 1-10 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'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×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.
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