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ORIGINAL ARTICLE |
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| Year : 2007 | Volume
: 32
| Issue : 1 | Page : 35-39 |
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Measuring malnutrition -The role of Z scores and the composite index of anthropometric failure (CIAF)
N Seetharaman, TV Chacko, SLR Shankar, AC Mathew
Department of Community Medicine, PSG Institute of Medical Sciences and Research Peelamedu, Coimbatore. Tamilnadu, India
| Date of Web Publication | 6-Aug-2009 |
Correspondence Address:
N Seetharaman
Department of Community Medicine, PSG Institute of Medical Sciences and Research Peelamedu, Coimbatore. Tamilnadu
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/0970-0218.53392
 Abstract | | |
Background : The current WHO recommendation is to use the Z-Score or SD system to grade undernutrition which allows us to measure all the three indices and express the results in terms of Z scores or standard deviation units from the median of the international reference population.
Objectives : To estimate the prevalence of undernutrition among under-five children in Coimbatore slums, using the Z-Score system of classification and the recently constructed Composite Index of Anthropometric Failure (CIAF). 2. To compare the Z-Score system with the Indian Academy of Pediatrics (IAP) classification of undernutrition.
Methods : Nutritional assessment was done using anthropometry and clinical examination. Children were weighed and measured as per the WHO guidelines on Anthropometry. Epi-Info 2002 software package was used to calculate the Z scores and for statistical analysis.
Results : Only 31.4% of the children studied were normal; 68.6% were in a state of "Anthropometric Failure". As per the Z score system, 49.6% were underweight (21.7% severely); 48.4% were stunted (20.3% severely) and 20.2% were wasted (6.9% severely). Whereas, as per IAP criteria, 51.4% were undernourished and 3.2% were severely undernourished. Using Underweight (low weight-for-age) as the only criterion for identifying undernourished children (as done in the Integrated Child Development Services currently) may underestimate the true prevalence of undernutrition, by as much as 21.9%.
Conclusions : More widespread use of the Z-Score system is recommended for identifying all the facets of undernutrition. Estimates of the true prevalence of undernutrition must incorporate a composite index of anthropometric failure.
Keywords: Z-Score Classification, Composite Index of Anthropometric Failure (CIAF), Anthropometry, Malnutrition, ICDS.
How to cite this article:
Seetharaman N, Chacko T V, Shankar S, Mathew A C. Measuring malnutrition -The role of Z scores and the composite index of anthropometric failure (CIAF). Indian J Community Med 2007;32:35-9 |
How to cite this URL:
Seetharaman N, Chacko T V, Shankar S, Mathew A C. Measuring malnutrition -The role of Z scores and the composite index of anthropometric failure (CIAF). Indian J Community Med [serial online] 2007 [cited 2021 Apr 21];32:35-9. Available from: https://www.ijcm.org.in/text.asp?2007/32/1/35/53392 |
India has the highest percentages of undernourished children in the world [1] . In any community, under-five children are one of the most vulnerable groups for nutritional deficiencies, owing to many factors ranging from Low Birth Weight to maternal ill health to socio-economic and environmental factors [2] . Most of these problems are accentuated and are highly unfavorable for a child growing in today's slums. It must be stated here that, although the words undernutrition and malnutrition are being used interchangeably, malnutrition is a broader term that includes under-nutrition and over-nutrition. In this study, the term undernutrition is used.
There have been quite a few attempts at grading the degrees of undernutrition. Weight-for-age classifications (Gomez, I.A.P) are the most commonly used. Height-for-age and Weight-for-height classifications (McLaren, Waterlow's) have been used less frequently [3] . Each of these classifications use different sets of reference data and each system employ different cut-off points to decide who is normal and who falls under mild, moderate, or severe undernutrition. The cut-off points are usually a certain percent of the mean/median or a percentile, of the reference population. Most of the cut-off points are admittedly arbitrary and do not carry a prognostic significance for any given individual child [4] . Employing different reference values and cut-off points has been a major hindrance in comparing data across various studies and countries. In India, the nationwide Integrated Child Development Services (ICDS) program uses the IAP criteria to grade undernutrition.
None of these classifications address all the three indices of undernutrition - Stunting, Wasting and Underweight. Stunting (Low height-for-Age) is an indicator of chronic undernutrition due to prolonged food deprivation and/or illness; Wasting (Low weight for height) is an indicator of acute undernutrition, the result of more recent food deprivation and/or illness; Underweight (Low weight-for-age) is used as a composite measure to reflect both acute and chronic undernutrition, although it cannot distinguish between them [4] .
The current WHO recommendation is to use the Z-Score or SD system to grade undernutrition. This system allows us to measure all the three indices and express the results in terms of Z scores or standard deviation units from the median of the international reference population, developed from anthropometric data collected in the United States by the National Center for Health Statistics (NCHS). Children who are more than 2 SD below the reference median (i.e. a Z-Score of less than -2) are considered to be undernourished i.e. to be stunted, wasted or to be underweight. Children with measurements below 3 SD (a Z-Score of less than-3) are considered to be severely undernourished [4] .
Although widely recommended, the Z Scores have not been widely in use in India, especially in community-based studies.
This is in spite of the fact that the nationally representative National Family Health Survey 2 (NFHS 2) uses Z scores to grade undernutrition [5] . The Z score system is not yet being widely used among researchers, probably because of the perceived difficulty in calculating the Z-Scores. The Epi-Info 2002 software developed and distributed by the Center for Disease Control, Atlanta [6] has eliminated this problem. Besides being sex-specific and able to measure all the three indices, the main advantage of Z scores is that it allows comparison across indicators and countries. Another advantage is that, Z-Scores can be subjected to summary statistics (such as Mean and SD), which help us to assess the quality of the data collected.
The three indices stunting, wasting and underweight reflect distinct biological processes and their use is necessary for determining appropriate interventions [4] . It must be remembered here that these indices overlap - i.e. a child who is underweight may also have wasting and/or be stunted and other similar combinations. On the one hand, none of the three indices is able to provide a comprehensive estimate of the total number of undernourished children in a community and on the other hand - since they overlap - we cannot add these three indices to get the overall prevalence. For a comprehensive measure of the overall prevalence of undernutrition, what is needed is a single aggregate indicator that incorporates all undernourished children, be they wasted and/or stunted and/or underweight.
Such an aggregate indicator - the Composite Index of Anthropometric Failure (CIAF) - has been proposed by Svedberg [7] . His original model suggests six sub-groups of anthropometric failure (labeled A-F); to which one more sub-group (labeled Y) has been added by Nandy et al [8] . The anthropometric sub-groups of the children are as follows: A - No Failure, B - Wasting only, C - Wasting + Underweight, D - Wasting + stunting + Underweight, E - Stunting + Underweight, F - Stunting only and finally, Y - Underweight only. The sum of the children in groups B to F provides the CIAF. As a single indicator, CIAF provides a single number to the overall estimate of undernourished children in a population, which none of the current indicators do. Furthermore, using the CIAF, anthropometric data can be disaggregated for further analysis, e.g. to analyze the specific risk factors & correlates or the mortality/morbidity patterns for the different types of anthropometric failure. Such disaggregation enables the identification of groups of children missed by conventional indices.
The current study uses the Z-Score system and the CIAF to estimate the magnitude of undernutrition among underfive children in the slums coming under the field practice area of the PSG Urban Health Center, Coimbatore. The appropriateness of using low weight-for-age as the only indicator for detecting childhood undernutrition has been analyzed. The calculations are in reference to the WHO/ NCHS International population.
| Material and Methods | |  |
Ten slums coming under the field-practice area of the Urban Health Centre, PSG Institute of Medical Sciences & Research, Coimbatore formed the study area. The Study population comprised of Children less than five years of age residing in the above-mentioned slums. The total number of under-five children in these 10 slums was 625. Sample size for the cross-sectional prevalence study was calculated using the formula Sample size (n) =4PQ/d 2 . With an expected prevalence of undernutrition (P) of 50% and a relative precision (d) of 10% of P, the required sample size was calculated as 400.
To arrive at the required sample size of 400, six out of the ten slums were randomly selected and all the under-five children in the six selected slums were included in the study. The actual number of children in these six slums was 405 and this was taken as the study population (n = 405). All the children up to 59 months of age living in the selected slums were included for the study. Children who were not resident of the slum, but visiting and children of families who had moved into the slum within the past 1 month were excluded from the study.
The exact age of the child was computed from the child's date of birth. When data on the exact date of birth was not available, the age as told by the mother was used, corrected to the nearest month. A regional local-events calendar was used to assist the mothers for better recall. Nutritional assessment was done using anthropometry and clinical examination. Children were weighed and measured as per the WHO guidelines on Anthropometry [4] . For children less than two years, the recumbent length was measured with the children lying down. Data collection was done over a period of two months.
Statistical analysis was done using EPI-INFO 2002 software package, from CDC. The Z-scores for the different nutritional indices - weight-for-age, height-for-age and weight-for-height were calculated in reference to NCHS International reference population by using the EPI-NUT component of the software. The prevalence of underweight (low weight-for-age), stunting (low height-for-age) and wasting (low weight for height) were calculated at the cut-off level of < -2 SD (Z-Score <2) and the prevalence of severe underweight, stunting and wasting at cut-off level of < -3 SD (Z-Score <-3) of the NCHS reference median values. Svedberg and later, Nandy et al have used these indicators to construct the CIAF. This index provides us with a single number to the overall prevalence of undernutrition in the community.
Chi-Square test was used to verify the statistical significance of the associations. P value of less than 0.05 was considered statistically significant.
| Results | | |
Majority (93.6%) of the study population were Hindus; 70.8% were living in nuclear families; 65.2% were practicing openair defecation; 74.8% were living in overcrowded dwellings and 86.4% had per-capita incomes less than Rs.750 per month. [Table 1] shows the age-sex distribution of the study population. Female children constituted 54.3% of the study group. The maximum numbers of children (21.5% each) were seen in the 24-35 and the 48-59 months age group.
[Table 2] presents the distribution of undernutrition among the children studied. Female infants (0-11 months) had a significantly lower prevalence of undernutrition compared to male infants (p<0.001). The Overall gender difference was not statistically significant.
[Table 3] shows the prevalence of underweight, wasting and stunting among the children studied. Conventional growth monitoring activities detect only those children with underweight (46.7 %). By Using Z scores, we can further identify children with wasting (20.2 %) and stunting (49.6 %).
CIAF permits us disaggregation of the undernourished children in to different subgroups, as shown in [Table 4]. Overall, only 127 (31.4%, group A) of the children studied were anthropometrically normal; 278 (68.6%) of the children were suffering from one or other form of "Anthropometric Failure". That is, summing up the children in groups B to F provides the CIAF (68.6%). By using low weight-for age (underweight) as the sole criterion for undernutrition, we can identify children from groups C, D, E and Y (189 children in our study) but will be missing those in groups B and F-children who are stunted or wasted but not underweight. In the current study, 89 such children (accounting to 21.9% of the total study population) would be missed out as 'not undernourished', if we use the popularly used low weightfor-age as the only indicator of undernutrition.
[Table 5] attempts a comparison between the IAP system and the Z score system of grading undernutrition. As per IAP criteria, 208 children (51.4%) were undernourished and 13 (3.2%) were severely undernourished (Grade III & IV). Compared to this, as per the Z score system 189 children (46.6%) were undernourished and 77 (19%) were severely undernourished. Although the overall prevalence of undernutrition is higher (by 4.8%) as per the IAP criteria, the Z score system identifies a much higher prevalence of severe undernutrition compared to IAP system. In the present study, 64 out of the 77 children graded as "Severely undernourished" (by Z score system) seem to fall under Grade II (the "Moderately undernourished" category) of the IAP system.
| Discussion | | |
In India, there is still a paucity of community-based studies on childhood undernutrition using the Z score system. Using the Z score classification, Studies from Haryana [9] and Punjab [10] report comparable prevalence levels. The relatively high prevalence of wasting observed among the children in the current study is indicative of a state of acute undernutrition, indicative of recent food deprivation and/or illness. NFHS 2 uses the Z score system of classification to grade undernutrition among Indian children. At the national level, the prevalence of underweight, stunting and wasting were 47%, 45.5 % and 15.5% respectively and the corresponding values for Tamilnadu were 36.7%, 29.4% and 19.9%.
Currently the IAP classification based on weight-for-age, is followed in the 'anganwadi' centers throughout the country to grade undernutrition at the grass-root level for the Government of India's project on the Integrated Child Development Services (ICDS). As revealed by [Table 5] the IAP system identifies 4.8% more children as undernourished, whereas the Z score system identifies significantly more children as severely undernourished. These "Severely undernourished" children are the ones who get additional nutritional supplementation under the ICDS. In our study, 64 out of the 77 children graded as "Severely undernourished" by Z score system fall under the Grade II "Moderately undernourished" category as per the IAP system. This has high practical significance, in light of the fact that priorities of nutritional supplementation through ICDS are inclined towards the "severely undernourished" children - Grades III & IV of the IAP system. A similar study [11] in West Bengal comparing the IAP and the Z score systems, found comparable results - 61% of the children were undernourished (3.9% severely) as per IAP criteria, whereas 46.6% were undernourished (6.9% severely) as per Z score system.
As seen from [Table 4], underweight children form only one subgroup of the total number of undernourished children i.e. children who show evidence of "anthropometric failure". Nandy et al have improved on the CIAF (originally proposed by Svedberg) which they have applied to the entire NFHS 2 dataset. In their study, "Children with no failure" (Group A) account for 40.2% while children with "Wasting and Stunting and Underweight" (Group D) account for 7.2% and children with "Stunting only" (Group F) account for 10.1%. In the current study, considerably fewer children- only 31.4% were normal or had 'no anthropometric failure' and 5.7% of children had "Wasting and Stunting and Underweight". The prevalence of "Stunting only" is relatively high - 19.3% among the slum children studied.
As evidenced by the current study, the use of underweight (low weight-for-age) as the sole criterion for identifying undernourished children may be underestimating the true load of undernutrition. Use of the CIAF helps us to visualize the extent of underestimation. Nearly 22% of the present study population - 89 undernourished children - would be missed if low weight-for-age is considered as the only indicator of undernutrition. CIAF provides an overall estimate on the number of undernourished children in a population, which none of the conventional indices provide. Attempts at estimating the overall prevalence of undernutrition in the population must integrate such an aggregate index of undernutrition. This could be a tool of considerable interest to health planners and policy makers - especially considering the fact that to compute the CIAF, the only additional data that needs to be collected is the height of the child. Measurement of the child's height as part of the routine ICDS growth monitoring is worth considering.
The limitations of this study include- the approximation of children's weight to the nearest 500 grams, which might have had an influence on the prevalence estimates. The date of birth as told by the mother has been used; crosschecking with records could not be done for all of the children. There have been concerns about the appropriateness of using the NCHS data as the reference population for Indian children [12] . To address this concern, WHO is in the process of developing a more appropriate reference population, which would be available soon [13] .
| Conclusions | | |
Overall, only 31.4% of the under-five children studied were anthropometrically normal. In other words, more than two thirds of the children were undernourished. This is a very serious problem, by any scale. Under such conditions, our intervention efforts need to be broader than providing supplementary nutrition alone.
More widespread use of the Z-Score system of classification, especially in community-based studies, is recommended. This system enables us to estimate/express the prevalence of undernutrition using all the three indices - underweight, stunting and wasting. This also allows meaningful comparisons with the nationally representative NFHS 2 database. The process of calculating the Z scores has been made very simple by the use of Epi-info software package developed and distributed freely by the CDC.
Current measures of undernutrition are, on their own, unable to give a reliable estimate of the overall number of undernourished children in a population. This issue has been addressed with the construct of the new indicator, CIAF. Findings from the current study suggest that conventional measures of undernutrition may be missing out a considerable proportion of undernourished children present in the population. The proportion of children identified as "severely undernourished" receive additional nutritional supplementation under the ICDS. Hence, underestimating this proportion might prevent undernourished children from receiving the benefit of the extra supplementation they deserve. The dissagregation of undernourished children in to different sub-groups (as done in CIAF) allows the researcher to further examine the relationship between particular combinations of undernutrition and poverty or morbidity/ mortality data (when available). Studies have shown that children with double or triple failures are more likely to be from poorer families and also have a higher morbidity risk than children with single failures [8] . Identification of these children with multiple failures has obvious implications in antipoverty policies. A comprehensive measure of the total load of undernutrition - such as the Use of the Composite Index of Anthropometric Failure discussed in this paper - must be incorporated in our attempts at quantifying undernutrition.
| Acknowledgement | | |
The authors would like to thank Mr.Nanjappan for his help in data collection, Miss.Narmada for her help in data analysis and Dr.YSS.Sivan for his continual efforts in improving the paper.
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