Children are uniquely placed in a context where external influences are likely to determine their food consumption. Evidence regarding the immediate food environment’s influence on dietary quality and/or weight status in children is limited. This thesis uses data from the West Midlands ActiVe lifestyle and healthy Eating in School children (WAVES) study to explore patterns of dietary intake in children aged 5-9 years (n=1467), some of the determinants of children's dietary consumption and their associations with child weight status. Findings suggest that children’s dietary consumption needs to be more healthful, and aspects of children's school and home life may have the potential to influence dietary quality and weight status. Specifically, a healthy home food environment was associated with increased fruit and vegetable intake and a lower weight status. Certain parental feeding practices, such as using food as a reward or to regulate emotion, were also associated with increased energy intake from free sugar and weight status. In conclusion, various environmental and behavioural factors are associated with children’s dietary intake and as such, coordinated efforts in a variety of settings are required to affect the ‘what’, ‘how’ and ‘in what context’ of children’s dietary consumption and consequently childhood obesity prevalence.

The Cognitive Abilities Profile (CAP) (Deutsch and Mohammed, 2010) is a collaborative tool for psychologists and teachers. The CAP is based on principles of Dynamic Assessment (DA) and uses a consultative model for rating pupils' cognitive abilities in various cognitive domains and for planning interventions to facilitate pupils' progress accordingly. The CAP was developed in response to a perceived need for educational psychologists (EPs) to have access to alternative assessments to standardised psychological tests, particularly in the case of learning disadvantaged and ethnic minority pupils. Using DA as one possible approach creates a need for EPs to have access to training and to receive support with the implementation of DA-based intervention methods within local services. However, surveys of EP use of DA indicate limitations in training, inadequate support and difficulties in wider application of DA. In the present work, a quantitative methodology has been used to examine the validity and reliability of the CAP in overcoming the above-noted difficulties in the implementation of DA by EPs. The methodology involved the collection and analysis of data from three groups of EPs, two of which conducted consultations with teachers using the CAP and the third group of EPs used its own choice of consultation methodology and functioned as a control group. The findings of the present work provide evidence of good construct validity of the CAP cognitive domains, adequate inter-rater reliability between CAP users and evidence of advantage for pupils in some areas of functioning between pre- and post-use of the CAP, as validated by independent standardised tests. Analysis of perceptions of EPs of the utility of the CAP, based on the results of feedback questionnaires, addresses issues of user friendliness of the CAP. CAP users agreed on the need for initial training for psychologists and support for practitioners. The findings have implications for adoption of a novel approach in EP and teacher related work.

The effects of androgens reach far and wide and can be physiological as well as pathological. They are not limited to males and involve almost every system in the human body. Their influence on reproductive development and behaviours is well studied, but more recently, attention has turned to the wider reaching consequences of androgen exposure. Disorders of sex development (DSD) are rare conditions in which individuals may be deficient in, or resistant to, the effects of androgens. The long-term health and quality of life for these individuals is not well reported, but where there are reports, there are descriptions of increased depressive like behaviours, anxiety and poor social functioning. Lack of androgens has been linked to poorer neurocognitive outcomes in some studies and there is a concern that more aggressive hormone replacement should be considered in early life for those individuals lacking in androgens. These disorders can be difficult to study for many reasons. Firstly, they are rare conditions. Secondly, adults with DSD do not tend to visit hospital regularly and can therefore be challenging to engage in research. Thirdly, studying the effects of early life exposure to steroid hormones and relating these to later life behaviours is incredibly complex. Animal models have been used for many years to study the hormonal environment. For my first study, I used a model of rodent neonatal androgen blockade by treating pups with the anti-androgen flutamide for the first five days of life. The animals were studied again in adolescence (6 weeks of age) and early adulthood (10 weeks of age). There were no significant differences found in testosterone, dihydrotestosterone and androstenedione levels in either age group, demonstrating that the androgen blockade was transient. The anogenital index (AGI) was significantly shorter in the treated animals when compared to controls at 6 weeks of age and 10 weeks of age. Phallus length was significantly shorter in treated males when compared to the healthy males at 6 weeks of age and at 10 weeks of age. Phallus weight was significantly lower in the treated animals at 10 weeks of age when compared to the healthy animals. This work demonstrated that my rodent model of neonatal androgen blockade was an effective one. My next study used the same rodent model and aimed to link the perinatal hormonal environment with in vivo brain chemistry using a painless, non-invasive technique known as Magnetic Resonance Spectroscopy. Using a mixed effects model, I analysed the effects of sex, gender, treatment with flutamide and age on the metabolite pattern of the rodent brain. Ɣ-aminobutyric acid (GABA), glucose, glutamine, glutamate, phosphocholine and myo-inositol all changed over time. The combined peaks of glutamate and glutamine also demonstrated a significant change over time. GABA, glutamate, phosphocholine and myo-inositol showed significant sex differences as did the combined peaks of glycerophosphocholine and phosphocholine, N-acetylaspartate (NAA) and N-acetylaspartylglutamate (NAAG) and glutamate and glutamine. Aspartate, GABA and myo-inositol were all significantly changed by treatment of the animals with flutamide and GABA and myo-inositol levels in treated males were similar to control females at both 6 and 10 weeks. My final study using the rodent model of androgen blockade looked at the histological changes in the brain. Brains were sectioned and stained for neuronal cell counts and microglial cell counts, and PCR for the Androgen Receptor (AR) was performed. I demonstrated significant, sexually dimorphic changes in neuronal cell counts, microglial cell counts and androgen receptor expression in two clearly defined areas in the rodent brain. In summary, my rodent work demonstrated a link between the neonatal hormonal environment and the sexually dimorphic chemistry and histology of the in vivo brain, and supports the hypothesis that the microglial cell plays a critical role in brain masculinisation. To include a translational aspect to this thesis I extended my work to a population of undermasculinised boys, who were attending hospital for an hCG stimulation test as part of their investigations for 46 XY DSD. The hCG stimulation test is a valuable method for assessing androgen production but there is a need to explore its utility in assessing androgen responsiveness and long-term prognosis. I aimed to assess the effects of the hCG test on the in vivo brain chemistry using MRS, and the peripheral transcriptome using microarray. I reliably demonstrated metabolites in the brains of healthy male infants, healthy female infants and affected male infants. Healthy male infants had significantly lower levels of N-acetylaspartate than affected males in the hypothalamus and lower levels of the phosphocholines in the frontal cortex. In my transcriptomic study of DSD patients, I demonstrated the existence of an androgen responsive group of small RNAs that are measurable in peripheral mononuclear blood cells, and that change over the short duration of an hCG stimulation test, raising the prospect of combining the biochemical assessment of testosterone production with an objective molecular assessment of androgen sufficiency. In summary, in this thesis I have successfully linked the early hormonal environment with later life in vivo brain chemistry, confirmed by histological studies. I have also identified a novel marker, which could potentially be used as an assessment of androgen sufficiency in the future.

Hypoglycaemia is an unavoidable consequence of treatment of Type 1 Diabetes Mellitus (T1DM). Symptoms are often embarrassing and distressing and can lead to the development of fear of hypoglycaemia (FoH). This fear can have a negative impact on diabetes management and can lead to further medical complications. 210 children and young people (CYP), aged 3-17 years and 190 parents from diabetes paediatric clinics across the West Midlands, UK, completed questionnaires exploring the prevalence of hypoglycaemia, FoH and links to hypoglycaemia awareness, self-care, quality of life and anxiety. Demographic information and HbA1c data were also collected. Results indicated that hypoglycaemia and severe hypoglycaemia (SH) are a problem for CYP in the UK. Hypoglycaemia Fear Survey (HFS) scores were higher in parents than in CYP (Total HFS 37.1±14.9 vs. 50.2±17.8 vs. 45.2±18.0, CYP vs. mother vs. father, respectively, p < 0.01). Adolescents with prior experience of severe hypoglycaemia (SH) had higher HFS scores compared to those without (t=-3.61, p < 0.001). Trait anxiety and SH explained 23% of the variance in HFS scores in adolescents. Trait anxiety explained 37% of the variance in HFS scores in under 11 year olds, 18% in mothers of under 11 year olds, 6% in mothers of adolescent and 10% in fathers of adolescents. There was no correlation between HFS and HbA1c. Qualitative analyses identified ‘Burden’ as an overarching theme from CYP and parent interviews. ‘Negative emotions’ and ‘Living with diabetes’ emerged as the key themes of analysis. This research study adds to existing findings on the prevalence of hypoglycaemia, severe hypoglycaemia, FoH and possible related factors, by focusing on the paediatric population and their parents, in the UK, for which there is limited research. Qualitative analyses also provided novel reports of the experience of T1DM for CYP and their mothers. Implications of this research could lead to the development of an FoH and anxiety managementprogramme for CYP and their parents. The findings of this study also help to raise awareness of this very real and current issue in diabetes management.

Thesis (Ph. D.)--University of Washington, 2003. / Vita. Includes bibliographical references (leaves 127-134).

The World Health Organization (WHO) recommends exclusive breast-feeding until 6 months of age, where exclusive breast-feeding is defined as giving human breast milk only with no other foods or fluids. This recommendation has since been adopted by many countries. A systematic review of studies in exclusively breast-fed infants by Reilly and colleagues found a mean milk intake at 6 months of age that seemed too low to cover infant energy requirements. However, the evidence was relatively scarce, only from cross-sectional studies and based on the method of test-weighing, which has been criticised for under-estimating milk intake. Furthermore, longitudinal studies indicated no marked increase in milk intake over time, but these studies did not include measurements at 6 months of age. Reilly and Wells proposed the hypothesis that for exclusive breast-feeding to adequately cover infant energy requirements to 6 months of age, either 1) infants had to be unusually small, or 2) breast milk energy content had to be unusually high, or 3) milk intake had to be unusually high. The Reilly-Wells hypothesis was backed up by evidence of a world-wide low prevalence of exclusive breast-feeding to 6 months, and by studies consistently reporting a maternally perceived insufficient milk supply as a major reason for mothers to cease exclusive breast-feeding and introduce either formula supplementation or complementary foods. Based on the Reilly-Wells hypothesis, the research question for the First-Feed study was: To explore how exclusive breast-feeding to 6 months of age is achievable – mainly from an energy balance point of view. The First-Feed study tested the hypothesis that successful exclusive breast-feeding to 6 months of age would include 1) infants that were small and/or growing slowly, 2) milk intakes and/or milk energy content that were higher than literature values and increasing over time, 3) infant energy requirements that were lower than reference values, and/or 4) infant feeding practices that were strained by very frequent and/or very time consuming breast-feeds. The study was designed as the first longitudinal observational study to use an isotopic method to measure milk intake and energy balance in exclusively breast-fed infants to 6 months of age, and it evaluated parts of the methodology employed in the study, in order to appreciate the results in light of the methodological strengths and limitations. The First-Feed study found that infants were overall of normal size and growing well relative to WHO Child Growth Standards. Metabolisable milk intakes were significantly higher than the values obtained by Reilly and colleagues at both 3½ and 6 months of age, and increased significantly over time. Infant energy requirements, determined as metabolisable energy intake, was significantly higher than references for mean energy requirements at 3½ months of age, while it was appropriate at 6 months of age. Breast-feeding practices showed no change over time in feeding frequency, but a significant decrease in time spent on breast-feeds. The First-Feed study had several limitations. Firstly, due to the inclusion criteria of exclusive breast-feeding, the participants were characterised as an affluent and well-supported sample of mother-infant pairs, who were highly motivated to breast-feed. Therefore, the generalisability of the present study to other populations should be accepted with caution. Secondly, the anthropometric measurements were prone to imprecision, as is often the case in field studies. Thirdly, the imprecision of the dose-to-infant procedure for administration of doubly-labelled water considerably reduced the precision of the doubly-labelled water method. This, in addition to the biological variation, increased the variation in some outcome variables. However, the First-Feed study is unique as it is the first to use a more objective method to measure milk intake in a longitudinal design, and on a sample of infants with a very high success rate of exclusive breast-feeding to 6 months of age. The WHO changed the recommendation on exclusive breast-feeding from 4 – 6 months to 6 months (exactly) in 2001. Since then, many resources have been invested in breast-feeding promotion, but rates of initiation, duration and exclusivity is only slowly improving. The present study supports that exclusive breast-feeding can adequately cover infant energy requirements to 6 months of age - even without undue strain on breast-feeding practices and even in mothers where initial breast-feeding problems were very common. However, the present study found a wide variation in both infant size, milk intake and energy requirements. It therefore begs the question if a recommendation based on one age-point (6 months exactly) is appropriate given the vast biological variation in variables that are important for the adequacy of exclusive breast-feeding, or if the recommendation should be adapted to include developmental milestones (e.g. oral motor skills) indicative of readiness for complementary foods.

The majority of children attending ophthalmology clinics require a visual acuity assessment. The optimal technique depends on age as well as the ability to cooperate with testing. Most acuity assessments are performed subjectively by an orthoptist. Objective acuity assessment by Visual Evoked Potential (VEP) provides a complementary assessment in those subjects who cannot complete subjective tests. The aim of this study was to develop and evaluate a rapid, objective visual acuity assessment. The technique was named the step_ VEP and is based on the real-time analysis of steady-state VEPs (ssVEP). It presents high contrast checkerboard stimuli of sizes 0.4 to 3.0 LogMAR with a successive approximation algorithm. Speed of response detection, specificity and sensitivity were optimised by investigation of recording montage and analysis techniques in a group of normal children and adults (N=102). The success, duration and outcome of step_ VEP acuity assessment was compared to transient VEP (t-VEP) acuity assessment and subjective acuity assessment in a group of paediatric patients (N=218). I-D Laplacian analysis of three occipital electrodes was significantly faster than conventional recording and analysis (Oz-Fz) at detecting ssVEP responses near visual acuity threshold (3' checks) from three years upwards, and at detecting responses to 6' and 9' checks in the 7-9 year age group. A lateral electrode site at 15% of the half-head circumference was fastest most often in adults. Step_ VEPs were 16% more successful than t-VEPs and 9% more successful than subjective tests in providing a complete acuity assessment. Subjective acuity scores were systematically higher than VEP acuity scores in subjects who successfully completed both assessments. A closer agreement with subjective acuity scores was found for step_ VEPs than t-VEPs. The disparity between step_ VEP acuity score and subjective acuity score was shown to reduce with age.

Objective: to examine the effects of work on health and pyschosocial status among boys aged 10-16 years in Jordan. Study design: This is a comparative cross-sectional study, comparing working and non-working with respect to health and psycho-social outcomes, taking account of confounding due socio-economical factors. Results. Bivariate analysis showed that child's work was a strong significant predictor for eight z score, height z score, PCV, morbidity, skinfold thickness percentile and PEFR. This significant effect persisted in the full regression models after controlling for socio-economic and smoking status. Working children had significant lower weight z score (B=-0.31), height z score (B=-0.51), PCV (B=-2.96), skinfold thickness percentile (B=-6.85) compared to non-working subjects. Pyschosocial score tended to be reduced by 13 points (better pyschosocial status) when the child was non-working (B=-12.7). The significant negative relationship between work and PEFR in the bivariate model disappeared in the full regression model. In multiple regression modelling work status explained 3% of the 6.5% of variance explained in the weight z-score model, 6.7% of 9.8% for height z-score, 12.5% of 14.9% for PCV, 15% of 21% for skinfold thickness, 115 of 24% for PEFR, 9.4% of 30.9% for morbidity and 46% of 50% for pyschosocial status. Mean height and weight z-scores and packed cell volume among working children were significantly lower than those of their siblings; 5% and 9.6% of working children respectively were wasted and stunted (z score<-2 SD) compared to none of the siblings. No statistically significant correlation was also found between weight z-scores, height z-scores, packed cell volume and skinfold thickness of siblings and the proportion of household income contributed by the working child. Duration of work, child's monthly income, household per capita income and maternal height, were significant predictors of the growth of working children expressed by weight and height z score.

Weight monitoring is an integral part of routine community child health care in the United Kingdom. An intensive focus on fluctuations in charted weight of young babies has been charged by some breastfeeding advocates with undermining continued breastfeeding. Concern has also been expressed by clinicians and women about the applicability of current growth charts to breastfed babies - a concern echoed by the World Health Organisation. This ethnographic study involved two phases. Six months' participant observation in a child health clinic in the Northwest of England was followed by longitudinal interviews with 14 breastfeeding women. Equal numbers of first and second-time mothers were included; they were interviewed two to three times in the first six months. Data were analysed using grounded theory, allowing an in-depth examination of the lived experiences of weighing and how these shaped on-going feeding decisions and the course of breastfeeding. Weighing babies was the major focus of clinic visits for women and for health visitors. Interactions centred on the concern that the baby's weight should 'follow the line' of the centiles on the chart. Mothers and health visitors also collaborated in efforts to achieve prescriptive routines of baby feeding and sleeping. Breastfeeding was treated as a milk production system, and required to measure up. If weight gain caused concern a variety of strategies were used, including formula supplements and 'worrying'. Techniques to improve the physical effectiveness of breastfeeding were not part of the routine approach to any feeding difficulty on the part of either mothers or health visitors. Using anthropological theory, the character of weighing as a ritual occasion is explored. Weighing sessions are shown to provide occasions to mark the rite of passage through the liminal time of early motherhood. Building on the observation of this ritual experience, it is suggested that the experience of breastfeeding is 'even more liminal', as our society treats formula feeding routines and growth as the implied norm for infants. Weight gain which conforms to chart centiles has become the measure and arbiter of breastfeeding adequacy. Minor fluctuations in weight were treated as potentially serious threats to infant health, while the maintenance of breastfeeding was considered secondary. Recommendations are offered for improving the practical conduct of routine weight monitoring to improve its ability to identify growth which should genuinely spark concern. At the same time, the need for rituals to ease women through their early months of motherhood and the experience of breastfeeding is highlighted. Currently breastfeeding as a method of feeding milk to babies is poorly supported with suggestions for improving physical effectiveness, while at the same time, breastfeeding as a social practice is pushed to the margins of normal everyday experience. This lived dilemma for women and the health visitors who support them deserves attention at national policy level and serious consideration in overall planning of services.

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