Mid-Upper-Arm-Circumference as a Growth Parameter and its Correlation with Body Mass Index and Heights in Ashram School Students in Nashik District in Maharashtra, India

Background: Under nutrition is a major problem among Indian schoolchildren. Yet, routine height and weight measurements in schools are nor used for growth monitoring. This study attempts to evaluate mid-upper-arm-circumference (MUAC) as a quick assessment tool against body mass index (BMI) in schoolchildren.

Objective: The objective of the study was to evaluate MUAC against BMI, height, and average skin fold thickness (ASFT) parameters and to estimate MUAC values across age, sex, and social categories.

Subjects and methods: The study was conducted in 2017-2018 in four randomly selected Ashram schools and an urban school in Nashik district. Girls (1187) and boys (1083) from age 6-18 were included, and height, weight, skinfold thickness, and MUAC were measured. MUAC was done on the left arm with Shakir's tape and tailor's tape (for MUAC >25 cm). Epi Info 7.1 and Excel were used for the data analysis.

Results: MUAC had a consistently high correlation with BMI at all ages for boys (r = 0.8786, P < 0.0001) and girls (r = 0.8586, P < 0.0001). ASFT too was strongly correlated with MUAC (r = 0.5945, P < 0.0001). MUAC had strong but nonlinear correlation with heights in girls (r = 0.7751, P < 0.0001) and boys (r = 0.8267, P < 0.0001). MUAC was higher for girls than boys at all ages. MUAC values for scheduled tribe (ST) children were highly significantly lower than non-ST students.

Conclusion: MUAC is a good and quick proxy tool for BMI and can serve as a sensitive nutritional indicator for school ages across socioeconomic categories. However, it is necessary to construct age-wise cutoff points and bandwidths using multicentric studies across income quintiles.