Reliability of anthropometric measures in a longitudinal cohort of patients initiating ART in West Africa
1 Département de Médecine Sociale et Préventive, Faculté de Médecine, Université de Montréal, Pavillon 1420 Mont Royal, C.P. 6128, succursale CV, Montréal, Québec, H3C 3J7, Canada
2 Institut de Recherche en Santé Publique de l'Université de Montréal, Faculté de Médecine, Université de Montréal, Pavillon 1420 Mont Royal, C.P. 6128, succursale CV, Montréal, Québec, H3C 3J7, Canada
3 Département de Nutrition, Pavillon Liliane-de-Stewart, Université de Montréal, C.P. 6128, succursale CV, Montréal, Québec, H3C 3J7, Canada
4 Service de Médecine Interne, Hôpital National du Point G, BP 33, Bamako, Mali
5 Axe de Recherche en Santé Mondiale, Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CR-CHUM), 3875 rue Saint-Urbain, 5ième étage, Montréal, Québec, H2W 1V1, Canada
BMC Medical Research Methodology 2010, 10:102 doi:10.1186/1471-2288-10-102Published: 22 October 2010
Anthropometric measurements are a non invasive, inexpensive, and suitable method for evaluating the nutritional status in population studies with relatively large sample sizes. However, anthropometric techniques are prone to errors that could arise, for example, from the inadequate training of personnel. Despite these concerns, anthropometrical measurement error is seldom assessed in cohort studies. We describe the reliability and challenges associated with measurement of longitudinal anthropometric data in a cohort of West African HIV+ adults .
In a cohort of patients initiating antiretroviral treatment in Mali, we evaluated nutritional status using anthropometric measurements(weight, height, mid-upper arm circumference, waist circumference and triceps skinfold). Observers with no prior experience in the field of anthropometry were trained to perform anthropometrical measurements. To assess the intra- and inter-observer variability of the measurements taken in the course of the study, two sub-studies were carried out: one at the beginning and one at the end of the prospective study. Twelve patients were measured twice on two consecutive days by the same observer on both study occasions. The technical error of measurement (TEM) (absolute and relative value), and the coefficient of reliability (R) were calculated and compared across reliability studies.
According to the R and relative TEM, inter-observer reliabilities were only acceptable for height and weight. In terms of intra-observer precision, while the first and second anthropometrists demonstrated better reliability than the third, only height and weight measurements were reliable. Looking at total TEM, we observed that while measurements remained stable between studies for height and weight, circumferences and skinfolds lost precision from one occasion to the next.
Height and weight were the most reliable measurements under the study's conditions. Circumferences and skinfolds demonstrated less reliability and lost precision over time, probably as a result of insufficient supervision over the entire length of the study. Our results underline the importance of a careful observer's selection, good initial preparation, as well as the necessity of ongoing training and supervision over the entire course of a longitudinal nutritional study. Failure to do so could have major repercussions on data reliability and jeopardize its utilization.