Obesity and Dental Caries in Young Children in Plymouth, United Kingdom: A Spatial Analysis.

OBJECTIVE: To examine the spatial clustering of obesity and dental caries in young children in Plymouth, United Kingdom, to evaluate the association between these conditions and deprivation, and explore the impact of neighbourhood-level characteristics on their distribution. BASIC RESEARCH DESIGN: Cross-sectional study analysing data from the National Child Measurement Programme (N=2427) and the Local Dental Health Survey (N=1425). The association of deprivation with weight status and caries was determined at individual and area level, using ANOVA and Poisson models. The overall spatial clustering was assessed using a modified version of the Global Moran's I, while clusters were located through Local Indicators of Spatial Association. Spatial autocorrelation was assessed using the variograms of the raw values. Log-linear Poisson models were fitted to assess the significance of neighbourhood characteristics on overweight/obesity and caries distribution. RESULTS: At an individual level, deprivation was not associated with BMI z-scores but was a significant predictor of caries (p⟨0.05). However, at area level, deprivation related to the rates of both conditions. A significant positive autocorrelation was observed across neighbourhoods for caries. The variograms suggested spatial autocorrelations up to 2.5 km and 3 km for overweight/obesity and caries, respectively. Among several neighbourhood characteristics, the proportion of people on benefits was found to be a significant predictor of caries rates. CONCLUSIONS: Our results underline the importance of considering geographic location and characteristics of the broader environment when developing strategies to target obesity and caries.

Evacuation decisions in a chemical air pollution incident: cross sectional survey.

OBJECTIVE: To compare the health outcomes in sheltered and evacuated populations after a chemical incident in a plastics factory. DESIGN: Cross sectional survey. SETTING: Urban area in southwest England. PARTICIPANTS: 1750 residents from the area exposed to the chemical smoke, of which 472 were evacuated and the remaining 1278 were advised to shelter indoors. MAIN OUTCOME MEASURE: Number of adverse health symptoms. A case was defined by the presence of four or more symptoms. MAIN RESULTS: 1096 residents (63%; 299 evacuated, 797 sheltered) provided data for analyses. The mean symptom score and proportion of cases were higher in evacuated people than in the sheltered population (evacuated: symptom score 1.9, cases 19.7% (n = 59); sheltered: symptom score 1.0, cases 9.5% (n = 76); P < 0.001 for both). The difference between the two groups attenuated markedly at the end of two weeks from the start of the incident. The two main modifiable risk factors for the odds of becoming a case were evacuation (odds ratio 2.5, 95% confidence interval 1.7 to 3.8) and direct exposure to smoke for more than two hours on the first day of the incident (2.0, 1.7 to 2.3). The distance of residence from the factory or level of exposure before intervention (first six hours) had little effect on the odds of a person becoming a case. CONCLUSIONS: Sheltering may have been a better protective action than evacuation in this chemical incident, which is consistent with the prevailing expert view. Although this study has limitations, it is based on a real event. Evacuations carry their own risks and resource implications; increased awareness may help to reduce unnecessary evacuations in the future.

Managing a large outbreak of cryptosporidiosis: how to investigate and when to decide to lift a 'boil water' notice.

The largest outbreak of cryptosporidiosis reported in the United Kingdom, involving 575 confirmed cases (of which 474 met an agreed case definition), occurred in the county of Devon during August and September of 1995. The descriptive epidemiology supports the hypothesis that the outbreak was associated with the consumption of cold tap water in the area served by a particular water treatment works. Cryptosporidium oocysts were detected in treated water samples at the time of the outbreak. Although the epidemiological analysis provided strong circumstantial evidence of a waterborne outbreak, the data were not recorded in a manner that made them admissible in criminal proceedings taken by the Drinking Water Inspectorate against the water company involved. The need to carry out an analytical study in conjunction with the identification and characterisation of the pathogen in the drinking water and the practicalities of agreeing criteria for lifting a 'boil water' notice are discussed.

Should children with developmental and behavioural problems be routinely screened for lead?

AIM: To test the hypothesis that children with behavioural and/or developmental problems have significantly higher blood lead concentrations than the general childhood population. METHODS: Blood samples were taken from 69 children with behavioural and/or developmental problems and 136 controls (children admitted for elective day case surgery under general anaesthetic). Blood lead estimations were carried out using graphite furnace atomic absorption RESULTS: Children with behavioural and/or developmental problems had higher lead concentrations than controls, both in terms of their distribution across the group (mean(geometric) lead concentrations: 40.7 (cases), 29.2 (controls), ratio of the means(geometric) 1.35 (95% CI 1.17, 1.58)) and the proportion of children with lead concentrations above those commonly defined as "toxic"-that is, 100 microg/l (12% (cases), 0.7% (controls); p < 0.001). Multiple linear regression suggested that this difference was not explained by differences in age, sex, or socioeconomic status of the two comparison groups. CONCLUSIONS: Children with behavioural and/or developmental problems are more likely to have significantly higher blood lead concentrations than the general childhood population. Lead, a known and more importantly, a treatable neurotoxin, would further contribute to the impairment suffered by these children. We argue that this group of children should be routinely screened for lead.

Deprivation and childhood obesity: a cross sectional study of 20,973 children in Plymouth, United Kingdom.

OBJECTIVE: To study the association between socioeconomic deprivation and childhood obesity. DESIGN: Cross sectional study. SETTING: All state primary schools in Plymouth. Plymouth is a relatively deprived city in the United Kingdom, ranking 338th of 366 local authorities on the Department of the Environment Index of Local Conditions. SUBJECTS: 20 973 children between the ages of 5 and 14 years, 1994-96. MAIN OUTCOME MEASURE: Numbers of obese children (body mass index (BMI) above the 98th centile) by quarters of Townsend score. RESULTS: Plymouth had a rate of childhood obesity two and half times that expected nationally (5% v 2%). The obesity prevalence increased with age, being almost double in the oldest age quarter (boys 6.2%; girls 7.0%), compared with the youngest age quarter. Within Plymouth, there was a significant trend for higher rates of obesity related to increasing deprivation in both boys (p=0. 017) and girls (p=0.018). The odds ratio (OR) for childhood obesity (highest-lowest quarter of Townsend scores) had borderline significance in boys (OR 1.29, 95% confidence intervals (CI) 1.00 to 1.65, p=0.049) but was larger and more significant in the girls (OR 1.39, 95% CI 1.08 to 1.80, p=0.011). Unlike boys, the association between obesity in girls and Townsend scores became stronger with age such that in the oldest age quarter (over 11.7 years), girls in the highest quarter of Townsend scores were nearly twice as likely be obese, as compared with the lowest quarter (OR 1.95, 95% CI 1.23 to 3.08, p=0.005). State of pubertal development could not be accounted for as this information was not available. CONCLUSIONS: This study provides evidence for an association between deprivation and childhood obesity in this English population. The health of children from deprived households is affected by a number of adverse influences. The high prevalence of obesity in these children is yet another factor that could predispose to greater morbidity in adult life.

'My ward is more deprived than yours'.

BACKGROUND: Increasingly, additional resources for infrastructure development and healthcare are directed at deprived areas. The commitment of the present government to reducing inequalities in health is likely to focus attention on identifying and providing special help to areas considered to be particularly deprived. This study compares the use of different deprivation measures at electoral ward level to rank wards according to deprivation and illustrates how the use of different deprivation measures may influence resourcing decisions. METHODS: The 20 local authority electoral wards making up the city of Plymouth, Devon, were studied. Some of the wards within Plymouth are amongst the most deprived in England. The scores for each ward for different measures of deprivation--Townsend, Jarman, the Department of Environment's Index of Local Conditions and Breadline Britain--were calculated and the wards ranked according to the deprivation score for each measure. Decisions on funding bids and resource allocation for wards within Plymouth were reviewed in the light of the relative deprivation status of the wards according to the various measures. RESULTS: The ranking of electoral wards for the selected measures of deprivation showed variation according to the measure used. The measure of deprivation chosen may have influenced resourcing decisions. CONCLUSION: Measures of deprivation are closely correlated one with another. However, by judicious choice of the deprivation measure used a ward can achieve a marked change in rank order. This may exert considerable influence on the decisions made by government departments, local authorities and health authorities when allocating resources.

Needs assessment at a practice level; using routine data in a meaningful way.

BACKGROUND: General practitioners and primary health care teams are asked to take an increasing role in assessing needs and priorities for the people they serve. We describe a model, using routinely available data, to provide health and social information to all general practices in an English Health Authority (South & West Devon, population 586,000, containing 103 general practices) to inform practice-based needs assessment. METHOD: Practice-coded hospital activity information was used where available, otherwise the FHSA population register was used to assign spatially referenced data (OPCS birth files, OPCS mortality files, cancer registration files and census information) to practices. Additionally, indicative incidences and prevalences were calculated for each practice using age- and sex-specific rates derived from national surveys (Survey of Morbidity Statistics from General Practice and the OPCS Health Survey for England). RESULTS: Information was produced for each practice on births, lifestyle, social factors, incidence and prevalence, hospital activity and mortality. Patient numbers rather than rates were presented. General practitioners commented that this approach gave an understanding of the size of health and social problems and fitted with the concept of numbers needed to treat. CONCLUSION: Public health involvement in practice-based needs assessment is essential. Current public health input has mainly been on a selective individual practice basis and is very resource intensive. This approach allows all practices to have immediate access to a wide range of health and social information presented in a way that is easily understood and informs debate on health needs within the practice.