The following considerations should be addressed when using objective methods for anthropometric assessment:
- Environment: have a safe, secure and private environment for the volunteer whenever possible. A calm environment is very important when measuring infants and toddlers. Distraction techniques like the use of bubbles are useful to occupy young
children. Minimise the risk of interruptions and have no more people present than are strictly necessary. Ensure conversations remain confidential and are not overheard by ‘passers-by’. Consider whether the gender of the observer or
field worker is likely to increase anxiety in certain population groups.
- Introduction: inform the volunteer of who you are and your role in the measurements. Volunteers should be informed prior to measurements with adequate and clear information to allow them time to consider, and the opportunity to ask questions.
- Information: at the point of measurement, explain the procedure clearly in advance to the volunteer, providing a rationale for the measurement when appropriate. If possible provide a demonstration or show the equipment. Demonstration of the
measurement can help when measuring children as they may be more concerned of the procedure than an adult.
- Interaction: More than almost any other anthropometric variable, body weight is associated with feelings of self-worth, body dissatisfaction and social anxiety. This is especially true for those who are very thin, obese and adolescents.
For these individuals, the process of being weighed is likely to induce acute emotional distress. Consider starting with the least sensitive or invasive measurements (e.g. height). This will help develop a rapport with the participant and minimise
anxiety and distress. Take care to use neutral language, avoiding judgemental terms such as ‘fat, overweight, obese, skinny, thin’.