Worldwide, 52 million children aged less than 5 years are wasted (weight-for-height Z-score (WHZ) <−2)( Reference Black, Victora and Walker 1 ). However, because infants below 6 months of age have often been excluded from surveys or rehabilitation programmes, their contribution towards this burden has been undetermined. It was recently estimated that worldwide 8·5 million infants aged less than 6 months are wasted (weight-for-length Z-score (WLZ) <−2)( Reference Kerac, Blencowe and Grijalva-Eternod 2 ). Wasting in infancy and childhood is associated with increased risk of hospital admission( Reference Bejon, Mohammed and Mwangi 3 , Reference Gaskin, Walker and Forrester 4 ) and death( Reference Black, Allen and Bhutta 5 ). In Kenya, 9·7 % of all infants aged less than 6 months are wasted (WLZ<−2)( 6 ). Undernutrition in early infancy may lead to impaired growth and brain development, mental illness( Reference Grantham-McGregor and Baker-Henningham 7 , Reference Victora, Adair and Fall 8 ) and may increase the likelihood of hypertension, CVD, diabetes and chronic thyroid disease in adulthood( Reference Gaskin, Walker and Forrester 4 , Reference Barker and Clark 9 , Reference Walker, Gaskin and Powell 10 ).
Mothers’ concern and recognition of illness in their children is the first step in seeking health care( Reference Jeffery, Voss and Metcalf 11 ). Mothers observe and monitor different aspects of infant growth and form an opinion on the health and nutritional status of their infants( Reference Eckstein, Mikhail and Ariza 12 , Reference Baughcum, Chamberlin and Deeks 13 ). These opinions are guided by local norms and influence health-care-seeking decisions and consequently the health of the infant( Reference Eckstein, Mikhail and Ariza 12 ).
In the developed world, where childhood obesity is a major concern, mothers are reported to misclassify between 30 and 80 % of obese children (BMI≥95th percentile), and between 70 and 98 % of children at risk of overweight (BMI≥85th to <95th percentile), aged 2 to 17 years, as being normal( Reference Jeffery, Voss and Metcalf 11 – Reference Zonana-Nacach and Conde-Gaxiola 21 ). This misperception varies by the child’s sex, maternal weight( Reference Maynard, Galuska and Blanck 14 , Reference Mamun, McDermott and O’Callaghan 19 , Reference Manios, Kondaki and Kourlaba 20 ) and mother’s level of education( Reference Baughcum, Chamberlin and Deeks 13 ). Improving caregivers’ awareness of obesity can enhance early and effective access to interventions( Reference Hackie and Bowles 17 ).
In the developing world childhood undernutrition remains prevalent( Reference Rajaratnam, Marcus and Flaxman 22 , Reference Victora, de Onis and Hallal 23 ), yet the role of maternal perception of nutritional status and effect on the outcome of nutritional interventions is unknown. There is a paucity of studies evaluating maternal perception of undernourished children. Among the few published, considerable variation exists in study design, age and number of participants, geographic location and the mode of assessing maternal perception. Two studies, one among Bangladeshi children aged 3–35 months( Reference Roy, Rahman and Mitra 24 ) and the other among Colombian children aged less than 4 years( Reference Bertrand and Walmus 25 ), reported contradictory findings regarding maternal classification of childhood undernutrition. These studies suggest the need for a better understanding of how to measure maternal perception and its contribution to childhood undernutrition. In Kenya, early introduction of complementary food is common and this predisposes infants to the risk of early undernutrition( 6 ) and the need for assessment before 6 months of age. The present study was designed to assess mothers’ perception of their infants’ growth and nutritional status and to compare this with anthropometric classification.
Methods
Study location and design
A qualitative study and cross-sectional quantitative survey were conducted from September 2011 through April 2012 in Ganze location in Kilifi District, Kenya. A recent survey among community children aged 6–17 months in the district reported the prevalence of wasting (WLZ<−2) as 6·4 %( Reference McOyoo 26 ).
Study participants
Mothers of infants aged between 4 and 6 months residing in Ganze location were eligible to participate in the study. Mothers were identified using mother–child health clinic records at the Ganze health centre. We set out to recruit every eligible mother in the catchment area of the health centre (using the sub-division geographic boundaries) during the study period rather than select a sample. Registered mothers, community health workers and community members were used to identify and trace unregistered peers.
Study procedure
We assessed mother’s perception using two approaches, a verbal description and a pictorial scale, and compared these with Z-scores for weight-for-age (WAZ) and for mid-upper arm circumference-for-age (MUACZ)( 27 ). We used mid-upper arm circumference (MUAC) because of the difficulty of conducting height-based measures where household visits required considerable trekking, and we have recently shown good accuracy and reliability in this age group( Reference Walker, Rudan and Liu 28 , Reference Mwangome, Fegan and Mbunya 29 ). Although MUACZ were used to facilitate comparison with other Z-score indices, in practice, absolute MUAC cut-offs are normally used. Recently, a MUAC cut-off of less than 115 mm was proposed for diagnosing acute malnutrition in infants aged less than 6 months( Reference Mwangome, Fegan and Fulford 30 ).
The study was undertaken in three steps as detailed in the following subsections.
Pictorial scale development and piloting
A pictorial rating scale was developed to reflect a spectrum of nutritional status in infants aged 4–6 months. Ten infants aged between 4 and 6 months were identified at the mother–child health clinic or paediatric ward at Kilifi District Hospital with MUACZ between −3 and +1. With informed consent, weight, length and MUAC measurement and naked digital photographs were taken. The photographs were converted to ‘pencil-line sketches’ using Adobe Photoshop CS5 software (Adobe Systems Inc., San Jose, CA, USA). The genital area of these images was then obscured. From ten sketches, experts (a medical anthropologist, a nutritionist (M.K.M.) and a paediatrician (J.A.B)) selected five sketches for piloting based on nutritional status, positioning of the infant and clarity. The final five sketches included infants with a MUAC of 90 mm (MUACZ≤−3), 120 mm (MUACZ >−3 to ≤−2), 125 mm (MUACZ >−2 to ≤−1), 135 mm (MUACZ >−1 to ≤0) and 165 mm (MUACZ>0; see Table 1 and online supplementary material, Supplemental Figure 1). The sketches were then printed on A4 paper and laminated to form ‘cards’ used for assessment.
Questionnaire to assess maternal perception of their infant’s nutritional status, rural Kenya
MUACZ, mid-upper arm circumference-for-age Z-score.
To assess the acceptability and utility of the scale, four discussion groups each with at least eight caregivers of infants aged 4–6 months visiting Ganze health centre were conducted. During the discussions, participants were encouraged to interact with the sketches and share their opinions regarding the appropriateness, relevance and acceptability of these sketches within their community. Participants were divided into two groups and asked to organise the sketches in any order of their choice. They were encouraged to use local terminologies in describing the selected order of sketches. Field notes were used to capture the contents of these discussions.
Questionnaire development and piloting
A structured, interviewer-administered questionnaire with a mixture of open- and closed-ended questions was developed. Maternal characteristics (age, level of education and parity) and infant characteristics (age, sex, vaccination status, recent illness episodes and infant feeding practices) were recorded. Specific questions quantifying maternal perception of their infant’s growth and nutritional status were embedded within the questionnaire, first by verbal description and then by pictorial scale (see Table 1 and online supplementary material, Supplemental Figure 2). Likert-type five-point symmetric scale responses were developed for these questions. For each question, the respondent was presented with a series of potential responses and a numerical value was assigned to each response to enable quantitative statistical analysis.
The questionnaire was piloted using ten in-depth interviews with community mothers of infants aged 4–6 months. Mothers were purposefully selected from the mother–child health clinic at Ganze health centre and were asked for permission to be interviewed. During the interview, questions were asked in the order presented in the questionnaire; responses and any difficulty in flow or comprehension were noted. These were later discussed with the respondent and the study team. The questionnaire was refined iteratively: each interview session used an improved version of the previous questionnaire. Additionally, time required for interview administration was also noted and was used in the consenting process.
Data collection
The full questionnaire was administered to mothers who consented to participate in the study. A trained interviewer visited each mother at her home and used the local Giriama language to conduct interviews. Initially, the main questionnaire and verbal description was recorded, and then the pictorial scale was administered. After the interview, the infant’s anthropometric measurements were taken following the procedure described in the UN guide( 31 ). Naked weight of the infant was obtained using a Salter scale (model 235–65 (25 kg×100 g); Salter Brecknell, Smethwick, UK) with a precision of 100 g, while MUAC was measured on the left arm of the infant using an insertion tape marker to the nearest millimetre.
Ethical considerations
The study was approved by the Kenyan National Scientific and Ethical Review Committees (SCC number 1962). For the development of the pictorial scale and participation in the questionnaire survey, written informed consent was sought, while verbal consent was sought during piloting. Only infants of caregivers who consented participated in the study.
Statistical analysis
Quantitative data were double entered using EpiData software and transferred to the statistical software package STATA 11 for cleaning and analysis. Z-scores, including weight-for-age and MUAC-for-age, were computed using the WHO 2006 growth reference standards STATA macro( 27 ). Infants were classified as wasted if they had MUACZ<−2 or as underweight if they had WAZ<−2.
Continuous variables were summarized as median and interquartile range (IQR) while categorical variables were presented as frequencies. The association between categorical variables was evaluated using χ 2 and Fisher exact tests, as appropriate. In order to evaluate the ‘diagnostic’ ability of maternal perception, the likelihood ratio of maternal perception in distinguishing undernutrition among infants was calculated. For that analysis, infants were classified using MUACZ and WAZ <−2 and >–2 as the gold standards. Using maternal perception, all infants classified as ‘unhealthy’ by verbal description or ‘undernourished’ by pictorial scale were considered undernourished while the rest were considered well nourished. Likelihood ratios were chosen for their ability to assess diagnostic tests( Reference Akobeng 32 ) and in our context summarise how more or less likely an undernourished infant is to be classified as such by maternal perception than well-nourished infants( Reference Akobeng 32 ).
Results
Results from piloting of study tools
In the discussion groups to pilot the pictorial scale, mothers recognised the sketches as images of infants and noted the different levels of nutritional status. In all groups, participants were able to organise the sketches correctly in a sequential order as informed by the general appearance of the body and its proportionality (e.g. relative sizes of the head and body). We found that there is a local concept of body proportions in relation to health called ‘mkando’ in the Kigiriama language (literally ‘moulding’ in English, e.g. a clay model). This concept was used to describe an infant whose head, body and leg dimensions were considered disproportionate.
During the interactive exercises, a poorly nourished child was said to grow poorly ‘kakulato’, or be of poor health ‘kana afya mbizdo’, or thin ‘mwambamba/adzaonda’; while a well-nourished child was said to be growing well ‘anakulato’, or of good health ‘anaafya mbizdo’, or fat/wobbly ‘tigwi tigwi’. It was observed that the local dialect lacked a single word for the English word ‘nutrition’ or phrase ‘nutritional status’; instead words translating to the English words ‘health’, ‘body size/proportion’ and ‘growth’ were used interchangeably to describe the concept of healthy growth. These findings informed the vocabulary, phrasing and order of questions in the final questionnaire.
Overall, these findings suggested that the sketches were acceptable and well comprehended and hence could be used in quantifying maternal perception within this community; and moreover, using suitable vocabulary, that a verbal description of an infant’s nutritional status could be obtained.
Results from the questionnaire survey
Description of study participants
We identified eighty-eight eligible mother–infant dyads; eighty-one from clinical records and seven from local informants and peer-tracing. At the time of survey, eleven of the mothers were away; one mother had died while two mothers could not be traced. Thus data on seventy-four infants (49 % male) and their mothers were available for analysis. The median age of participant mothers was 27 (IQR 23–32) years with a median of four children each (IQR 2–6). Mothers were often illiterate, with thirty-seven (50 %) reported no schooling at all. The median age of the infants was 4·6 (IQR 4·1–5·7) months. The median age for introducing complementary feeds was 3 (IQR 2–4) months. Median MUACZ was –0·72 (IQR −1·14, 0·05) and median WAZ was −0·52 (IQR −1·42, 0·08). Seven (9·5 %) of the infants were wasted (MUACZ<−2), while eight (10·8 %) were underweight (WAZ<−2). Infant nutritional classification by MUACZ varied by mother’s age and years of schooling (P<0·05; Table 2).
Infant and maternal characteristics by infant nutritional status (MUACZ); infants aged 4–6 months, and their mothers, Ganze location in Kilifi District, rural Kenya, September 2011–April 2012
MUACZ, mid-upper arm circumference-for-age Z-score.
Classification by maternal perception compared with mid-upper arm circumference-for-age and weight for-age Z-scores
In the present study, infants classified as ‘healthy’ by verbal description and ‘well nourished’ by pictorial scale differed significantly in MUACZ and WAZ from those classified as ‘unhealthy’ and ‘undernourished’ (Table 3).
Maternal perception of their infant’s nutritional status by MUACZ, absolute MUAC and WAZ; infants aged 4–6 months, and their mothers, Ganze location in Kilifi District, rural Kenya, September 2011–April 2012
MUACZ, mid-upper arm circumference-for-age Z-score; MUAC, mid-upper arm circumference; WAZ, weight-for-age Z-score.
Of the seven wasted infants, four (57 %) were incorrectly classified as being healthy by verbal description. Similarly, of the eight underweight infants, six (75 %) were missed by verbal description. The positive and negative likelihood ratios were 3·57 (95 % CI 1·44, 9·98) and 0·69 (95 % CI 0·50, 0·96) respectively for MUACZ<−2; and 4·60 (95 % CI 1·60, 13·3) and 0·67 (95 % CI 0·49, 0·92) respectively for WAZ<−2.
Using the pictorial scale, ten infants were classified by mothers as undernourished, forty-two as being at risk and twenty-two as well nourished (Table 3). Three (43 %) of the seven wasted infants and five (63 %) of the eight underweight infants were misclassified as being ‘at risk’ using the pictorial scale. The positive and negative likelihood ratios were 8·30 (95 % CI 1·91, 36·3) and 0·69 (95 % CI 0·52, 0·93) respectively for MUACZ<−2; and 4·31 (95 % CI 1·22, 15·0) and 0·78 (95 % CI 0·61, 1·00) respectively for WAZ<−2 (Table 3).
Mothers’ perception of optimal nutritional status
Mothers were asked to select a sketch that closely resembles the ideal size for their infants (Table 1). In response, sixty-four (88 %) of the mothers selected the images representing the normal and above-normal infant sizes. Further, when asked to identify the sketch representing an infant in an alarming state of health, sixty-three (85 %) of the mothers selected the sketch representing a severely malnourished infant. Maternal responses did not vary by infant’s nutritional status (P>0·05).
Discussion
Our results indicate that among rural, often illiterate mothers, the sensitivity of maternal perception for malnutrition in infancy is low. Mothers were more likely to positively identify undernutrition in their own infants when using the pictorial scale than when using verbal description.
There is a scarcity of published literature evaluating maternal perception of childhood undernutrition in African populations. A study in Columbia agreed with our findings: among 508 children aged 0–4 years, across a spectrum of nutritional status, maternal perception by verbal description poorly predicted child’s nutritional status( Reference Bertrand and Walmus 25 ). In contrast, in another study involving 339 Bangladeshi children aged 3–35 months, all of whom were recruited from a health facility, the majority of mothers could identify undernutrition in their children by verbal description( Reference Roy, Rahman and Mitra 24 ). Further, within the Bangladeshi sample, less educated mothers identified wasted (MUAC<125 mm) and underweight (WAZ<70 %) children slightly more often than in our study, with a sensitivity of 59 % and 67 % respectively( Reference Roy, Rahman and Mitra 24 ). However, the notable differences in age of participants, thresholds used to define wasting and underweight and the prevalence of undernutrition within the sampled populations make it difficult to compare either of these studies with our results.
Because of the risk of death associated with childhood undernutrition( Reference Black, Allen and Bhutta 5 , Reference Mwangome, Fegan and Fulford 30 ) it is desirable to have a screening test with high levels of sensitivity. However, subjective measures of nutritional status are likely to be used in contexts of limited preventive and treatment resources. In such circumstances a high specificity, with preferably less than 5 % of false positives, is preferred depending on the interventions on offer( Reference Briend, Maire and Fontaine 33 ). In our study, high specificity of 96 % was observed for the pictorial scale, suggesting that it may be used in place of MUACZ to identify non-wasted infants. However, this finding needs to be validated on a larger sample of undernourished infants. Overall there is weak evidence for the use of maternal perception in nutritional screening and our results emphasise the use of objective measures of nutritional status for infant assessment. This finding presents a very strong argument for proactive anthropometric screening of infants as visual assessment does not adequately discriminate undernutrition in infants aged below 6 months.
There are no validated tools for assessing maternal perception within our setting. We used two methods to evaluate maternal perception and found the results to differ. One study in the USA reported using a similar approach to assess maternal perception within the context of childhood obesity and found no difference in proportion misclassified by verbal description compared with a pictorial scale( Reference Eckstein, Mikhail and Ariza 12 ). That study however was conducted among a sample of literate mothers of 2–17-year-old children. Further, the differences in contexts and participant characteristics make the study findings difficult to compare with ours. In order to validate our study’s findings, other studies in similar settings need to be performed.
Challenges in assessing maternal perception
Our results indicate that depending on the method of assessment applied, mothers’ classification of undernourished infants differed. This difference may be related to several methodological challenges associated with the application of a pictorial scale and verbal description( Reference Bernal, Wooley and Schensul 34 ). In an interview-administered Likert-scale verbal description, the participant is required to listen through the question and the list of possible responses. It is assumed that the participant will comprehend the Likert order before deciding a possible response. This three-stage intellectual process may be challenging for respondents with little or no schooling experience. Alternatively, the interview-administered pictorial scale has the advantage of capturing the attention of the participant( Reference Houts, Doak and Doak 35 ), hence facilitating comprehension of the concept of ordered categories, i.e. the participant can see that the images are of different sizes and make out the right order. In our study, further interaction with the images ensured that the mother considered all the options before selecting a response and hence the increased likelihood of recognizing wasting by the pictorial scale method.
In future, the pictorial scale developed could be used to assess the perception of fathers and grandmothers on infant growth, health and nutritional status. Further, it can be used to facilitate discussions on a series of topics including appropriate infant feeding practices, how to archive ideal infant growth/health, exploring challenges in infant feeding and consequences of infant undernutrition among other topics.
Strengths and limitations of the study
Using a combined approach provided a complete assessment of maternal perception and made it possible to compare the performance by either of the methods. In the present study all data were collected by one observer, hence increasing the reproducibility and trustworthiness of the study findings. Some limitations to the study include the small proportion (only 10 %) of undernourished infants, which might have increased the probability of not finding a difference in the classification of undernourished infants where there might have been one. However, the study findings were broadly aligned with results reported from a similar study in Bangladesh( Reference Roy, Rahman and Mitra 24 ) and this increased confidence in the results. Further validation would be achieved by conducting similar evaluation of maternal perception on a larger sample of undernourished infants.
Conclusion
In the present study, maternal classification by pictorial scale was more accurate than verbal description, but both were associated with under-classification of wasting and underweight in infants. These results confirm the need to perform anthropometric assessment in this age group at a community level. Simple and affordable anthropometric tools such as MUAC should be evaluated for objective nutritional assessment by health workers and possibly mothers of infants within this age group.
Acknowledgements
Acknowledgements: The authors acknowledge Pricilla Neema Nguma for her assistance in identifying, locating and interviewing study participants; and Dr Caroline Jones, the medical anthropologist who assisted with developing the sketches. They also acknowledge the support from KEMRI, CGMR – Coast and the Ministry of Health – Kenya for permission to access health facilities and health staff, Ganze village health committee, the study participants and community for their cooperation. Financial support: This work was supported by KEMRI through the strategic award (084538) and personal fellowship (083576) from the Wellcome Trust and is published with the permission of the Director, KEMRI. Conflict of interest: None. Authorship: M.K.M. conceived and designed the study; was involved in the processes of data acquisition, data cleaning and analysis, and interpretation; and wrote the first draft of the manuscript. J.A.B. and A.M.P. jointly supervised M.K.M. in all aspects of this work; participated in study design and proposal writing; provided overall supervision, advice and expertise on tool development and data analysis; and reviewed and revised the manuscript. G.F. provided statistical support and advice on the study design, data analysis and interpretation. All authors were involved in writing, have read and approved the final manuscript. Ethics of human subject participation: The study was approved by the Kenyan National Scientific and Ethical Review Committees (SCC number 1962). For the development of the pictorial scale and participation in the questionnaire survey, written informed consent was sought, while verbal consent was sought during piloting. Only infants of caregivers who consented participated in the study.
Supplementary material
To view supplementary material for this article, please visit http://dx.doi.org/10.1017/S1368980014001074
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