Effect of neighbourhood socioeconomic status on overweight and obesity in children 2-15 years of different ethnic groups.

BACKGROUND: Studies on the influence of neighbourhood socioeconomic status (N-SES) on overweight and obesity rates in children from different ethnic backgrounds are scarce. This study investigated the differential effect of N-SES on overweight (including obesity) and obesity prevalence in different ethnic groups, and if N-SES explains ethnic differences in the prevalence of overweight and obesity. DESIGN: A population based study of 109 766 body mass index (BMI) measurements of 86 209 children 2-15 years of Dutch, Turkish, Moroccan and South Asian descent. BMI class was determined with The International Obesity Task Force, and South Asian specific BMI cut-offs. WHO BMI criteria were applied for reference purposes. The effect of N-SES on prevalence rates was studied with generalized linear mixed models. RESULTS: Neighbourhood SES was negatively associated with overweight and obesity. However, the effect of N-SES on overweight was stronger in Dutch children (OR 0.75, 95% CI 0.73-0.77) than in Turkish (OR 0.86, 95% CI 0.82-0.90), Moroccan (OR 0.91, 95% CI 0.86-0.97) and South Asian (OR 0.90, 95% CI 0.84-0.96) children. The influence of N-SES on obesity showed a similar pattern, except for Moroccan children in whom obesity prevalence remained stable over the whole N-SES range. At the same N-SES, overweight and obesity prevalence was significantly higher in Turkish, Moroccan and especially South Asian children compared with Dutch children. Adjusting for N-SES attenuated the ethnic differences. CONCLUSIONS: Neighbourhood SES was negatively associated with overweight and obesity rates in all ethnic groups, but only partly explained the ethnic differences in overweight and obesity prevalence.

BMI-for-age in South Asian children of 0-20 years in the Netherlands: secular changes and misclassification by WHO growth references.

BACKGROUND: South Asians are prone to cardiometabolic disease at lower BMI levels than most other ethnic groups, starting in childhood. The magnitude of BMI misclassifications is unknown. AIM: To compare the BMI distribution of contemporary South Asian 0-20 year olds in the Netherlands with: (1) The South Asian norm reference (secular trends); and (2) The WHO child growth standard and reference. SUBJECTS AND METHODS: The BMI-for-age distribution of 6677 routine measurements of 3322 South Asian children, aged 0-20 years, was described with the LMS method and BMI z-scores. RESULTS: The BMI distribution in South Asian 0-4 year olds was almost similar to the norm reference (mean BMI z-score = 0.11, skewness = 0.31, SD = 1.0), whereas in 5-19 year olds the distribution had shifted upwards (mean = 0.53) and widened (skewness = -0.12, SD = 1.08). Overweight (incl. obesity) and obesity peaked at 8-10 years, at 45-48% and 35-37%, respectively. Relative to the WHO references, the BMI distribution was left-shifted at ages 0-4 years (mean BMI z-score = -0.46, skewness = 0.23, SD = 0.98) and widened at ages 5-20 years (mean = 0.05; skewness = -0.02, SD = 1.40). At most ages, thinness rates were significantly higher and obesity rates lower than based on South Asian norms. CONCLUSIONS: A secular change of BMI-for-age in South Asian children mostly affected children >4 years. WHO references likely under-estimate overweight and obesity rates in South Asian children.

Prevalence of vitamin D deficiency among Turkish, Moroccan, Indian and sub-Sahara African populations in Europe and their countries of origin: an overview.

UNLABELLED: Vitamin D status of nonwestern immigrants in Europe was poor. Vitamin D status of nonwestern populations in their countries of origin varied, being either similar to the immigrant populations in Europe or higher than in European indigenous populations. Vitamin D concentrations in nonwestern immigrant populations should be improved. PURPOSE: The higher the latitude, the less vitamin D is produced in the skin. Most European countries are located at higher latitudes than the countries of origin of their nonwestern immigrants. Our aim was to compare the serum 25-hydroxyvitamin D (25(OH)D) concentration of nonwestern immigrant populations with those of the population in their country of origin, and the indigenous population of the country they migrated to. METHODS: We performed literature searches in the "PubMed" and "Embase" databases, restricted to 1990 and later. The search profile consisted of terms referring to vitamin D or vitamin D deficiency, prevalence or cross-sectional studies, and countries or ethnicity. Titles and abstracts were reviewed to identify studies on population-based mean serum 25(OH)D concentrations among Turkish, Moroccan, Indian, and sub-Sahara African populations in Europe, Turkey, Morocco, India, and sub-Sahara Africa. RESULTS: The vitamin D status of immigrant populations in Europe was poor compared to the indigenous European populations. The vitamin D status of studied populations in Turkey and India varied and was either similar to the immigrant populations in Europe (low) or similar to or even higher than the indigenous European populations (high). CONCLUSIONS: In addition to observed negative consequences of low serum 25(OH)D concentrations among nonwestern populations, this overview indicates that vitamin D status in nonwestern immigrant populations should be improved. The most efficacious strategy should be the subject of further study.

Neonatal anthropometry: thin-fat phenotype in fourth to fifth generation South Asian neonates in Surinam.

We assessed whether the earlier described 'thin-fat phenotype' is present in Surinam South Asian babies of the fourth to fifth generation after migration from India. In this observational study we collected data from 39 South Asian term neonates and their mothers in Paramaribo, Surinam. We compared the following data with data from an earlier study in Southampton, UK (338 neonates) and in Pune, India (631 neonates): maternal body mass index, neonatal weight, length, head, mid-upper arm and abdominal circumferences and subscapular skinfold thickness. The mothers in Paramaribo were older than the Southampton mothers; their body mass index was comparable. Mean birth weight was 3159 g (Southampton: 3494 g; Pune: 2666 g). Compared with Southampton babies, the Paramaribo babies were smaller in nearly all body measurements, the smallest being abdominal circumference at the umbilicus level (s.d. score: -1.62; 95% confidence interval (CI): -2.07 to -1.16) and mid-upper arm circumference (s.d. score: -1.08; 95% CI: -1.46 to -0.69). In contrast, subscapular skinfold thickness was similar (s.d. score: +0.08; 95% CI: -0.24 to +0.55). Except for subscapular skinfold thickness and length, all neonatal measurements were intermediate between those from Southampton and Pune. The thin-fat phenotype is preserved in Surinam South Asian neonates of the fourth to fifth generation after migration from India.

Vitamin D status and bone mineral density in the Chinese population: a review.

UNLABELLED: Low vitamin D status is associated with low bone mass which, in turn, is an important predictor of fracture. However, data on this relationship in non-Caucasian populations are scarce. This review shows such an association in the Chinese population in five of the 11 included studies. INTRODUCTION: In the elderly population, the serum 25-hydroxyvitamin D [25(OH)D] concentration is often inadequate. This may cause a lower bone mineral density (BMD), which is an important predictor of fracture. It is estimated that by 2050 more than half of all hip fractures worldwide will occur in Asia. However, data on the relationship between vitamin D status and BMD in a non-Caucasian population are scarce. Therefore, this study reviews the literature on the relationship between serum 25(OH)D and BMD in the Chinese population. METHODS: A search was made in PubMed, EMBASE, Web of Science and Cochrane Library (up to December 2014) to identify relevant studies using the terms vitamin D status, bone mineral density, and Chinese. RESULTS: Of the 293 studies identified, 11 fulfilled the inclusion and exclusion criteria and were analyzed. Mean serum 25(OH)D concentrations ranged from 29-82 nmol/L. In 5 of the 11 studies, an association was found between vitamin D status and BMD in the Chinese population. CONCLUSION: The evidence for a relationship between the serum 25(OH)D concentration and BMD in the middle-aged and elderly Chinese population living in Asia appears to be limited and inconsistent.

Impact of a social network-based intervention promoting diabetes self-management in socioeconomically deprived patients: a qualitative evaluation of the intervention strategies.

OBJECTIVE: There is a need for effective interventions that improve diabetes self-management (DSM) among socioeconomically deprived patients with type 2 diabetes. The group-based intervention Powerful Together with Diabetes (PTWD) aimed to increase social support for DSM and decrease social influences hindering DSM (eg, peer pressure, social norms) in patients living in deprived neighbourhoods. Through a qualitative process evaluation, this paper aims to study whether this intervention changed social support and social influences, and which elements of the intervention contributed to this. METHODS: The intervention group (IG) was compared with a standard group-based educational intervention (control group, CG). 27 qualitative in-depth interviews with participants (multiethnic sample) and 24 interviews with group leaders were conducted. Interviews were coded and analysed using MAXQDA according to framework analysis. RESULTS: Patients in the IG experienced more emotional support from group members and more instrumental and appraisal support from relatives than those in the CG. Also, they were better able to recognise and cope with influences that hinder their DSM, exhibited more positive norms towards DSM and increased their priority regarding DSM and their adherence. Finally, the engagement in DSM by relatives of participants increased. Creating trust between group members, skills training, practising together and actively involving relatives through action plans contributed to these changes. CONCLUSIONS: A group-based intervention aimed at creating trust, practising together and involving relatives has the potential to increase social support and diminish social influences hindering DSM in socioeconomically deprived patients with diabetes. Promising elements of the intervention were skills training and providing feedback using role-playing exercises in group sessions with patients, as well as the involvement of patients' significant others in self-management tasks, and actively involving them in making an action plan for self-management. These positive results justify the value of further evaluating the effectiveness of this intervention in a larger sample. TRIAL REGISTRATION NUMBER: NTR1886, Results.

Determinants of participation in a cardiometabolic health check among underserved groups.

Cardiometabolic diseases affect underserved groups disparately. Participation in health checks is also lower, widening health inequalities in society. Two-stage screening (non-invasive health risk assessment (HRA) and GP consultations for high-risk individuals) seems cost-effective, provided that drop-out rates are low in both steps. We aimed to explore the process of decision-making regarding HRA participation among underserved groups (45-70 y): native Dutch with a lower socioeconomic status (SES), Turkish, Moroccan, and Surinamese participants. We conducted a cross-sectional questionnaire study. The questionnaire comprised the following determinants: a self-formulated first reaction, a structured set of predefined determinants, and the most important barrier(s) and facilitator(s) for HRA completion. We used univariable and (stepwise) multivariate logistic regression analyses to assess which determinants were associated with HRA completion. Of the 892 participants in the questionnaire, 78% (n = 696) also completed the HRA. Moroccans and patients from GP practices with a predominantly non-Western population less often completed the HRA. A lower SES score, wanting to know one's risk, not remembering receiving the invitation (thus requiring a phone call), fear of the test result and/or adjusting lifestyle, perceived control of staying healthy, wanting to participate, and perceiving no barriers were associated with completing the HRA. We conclude that our 'hard-to-reach' population may not be unwilling to participate in the HRA. A more comprehensive approach, involving key figures within a community informing people about and providing help completing the HRA, would possibly be more suitable. Efforts should be particularly targeted at the less acculturated immigrants with an external locus of control.

Thin-fat insulin-resistant phenotype also present in South Asian neonates born in the Netherlands.

Several studies have shown that South Asian neonates have a characteristic thin-fat insulin-resistant phenotype. The aim of our study was to determine whether this phenotype is also present in South Asians who have migrated to a Western country (the Netherlands). South Asian and white Dutch pregnant women were included in our study. After delivery, cord blood was collected and neonatal anthropometry was measured within 72 h. Compared with white Dutch mothers, South Asian mothers were younger (28.5 v. 32.2 years, P<0.001) and had a higher prepregnancy body mass index (25.1 v. 23.0, P=0.001). Gestational age at delivery was on average 4 days shorter in South Asians (274.9 v. 278.8, P=0.001). To compare the two groups of neonates, we calculated sex- and gestation-specific s.d. scores using the values for mean and s.d. obtained from the white Dutch subjects as a reference. All measurements were smaller in South Asian neonates, except for those of the skinfolds. The largest difference was found in abdominal circumference (s.d. score 1.39, 95% CI -1.76 to -1.01). Triceps and subscapular skinfolds were similar in both groups (triceps s.d. score -0.34, 95% CI -0.88 to +0.20 and subscapular s.d. score -0.03, 95% CI -0.31 to +0.25). South Asian neonates had higher cord plasma levels of triglycerides (0.40 v. 0.36, P=0.614), glucose (5.4 v. 4.8, P=0.079) and insulin (6.3 v. 4.0, P=0.051). However, these differences were not statistically significant. After adjustment for birth weight, the difference in insulin became statistically significant (P=0.001). We therefore conclude that the thin-fat insulin-resistant phenotype is also present in South Asian neonates in the Netherlands.

[Prevalence of diabetes mellitus and cardiovascular disease among immigrants from Turkey and Morocco and the indigenous Dutch population]. / Prevalentie van diabetes mellitus en hart- en vaatziekten onder Turkse, Marokkaanse en autochtone Nederlanders.

OBJECTIVE: To gain insight into the prevalence of diabetes mellitus and cardiovascular disease among Turkish and Moroccan immigrants in the Netherlands. DESIGN: Secondary analysis of data from a cross-sectional study in 1999/'00. METHOD: The prevalence of self-reported diabetes and cardiovascular disease was studied in a sample of 743 Turkish, 641 Moroccan and 537 ethnic Dutch persons aged 35 to 74 years from the population of Amsterdam, the Netherlands, using an oral questionnaire. Ethnic differences in the prevalence of diabetes and cardiovascular disease were studied by logistic regression analysis controlling for age, sex and educational level. Further, in the case of diabetes, we examined whether or not the differences could be explained by overweight and physical inactivity, and in the case of cardiovascular disease we investigated the relationship with smoking and diabetes. In addition, the association between diabetes and cardiovascular disease was investigated. RESULTS: The Turkish and Moroccan population reported diabetes more often than did the ethnic Dutch (12.3, 12.4 and 3.0%, respectively). The differences were still present after controlling for sex, age, educational level, overweight and physical inactivity. Cardiovascular disease was more prevalent among the Turks (10.6%) than among the indigenous Dutch population (5.0%), but this was not true for the Moroccans (5.4%). The difference between Turkish and ethnic Dutch people still persisted after controlling for educational level, overweight, physical inactivity, smoking and diabetes. The association between diabetes and cardiovascular disease was consistent for all groups studied. CONCLUSIONS: The prevalence of diabetes was higher among Turkish and Moroccan immigrants than among the indigenous Dutch population. Cardiovascular disease was more prevalent among the Turks, but not among the Moroccans. The association between diabetes and cardiovascular disease was consistent for all three ethnic groups.

Declining and stabilising trends in prevalence of overweight and obesity in Dutch, Turkish, Moroccan and South Asian children 3-16 years of age between 1999 and 2011 in the Netherlands.

OBJECTIVE: In many developed countries, overweight and obesity prevalence seems to stabilise. The aim of this study was to determine trends between 1999 and 2011 in overweight and obesity prevalence, and mean Body Mass Index (BMI) z-score in Dutch, Turkish, Moroccan and Surinamese South Asian children in the Netherlands. DESIGN: A cross-sectional population-based study with 136 080 measurements of height and weight of 73 290 children aged 3-16 years. BMI class and BMI z-score were determined with the latest International Obesity Taskforce (IOTF) criteria, with overweight defined as an adult BMI equivalent ≥ 25 and obesity ≥ 30. Time trends per year were analysed using logistic and linear regression analyses. RESULTS: The prevalence of overweight in Dutch children declined from 13% to 11% (OR 0.960; 95% CI 0.954 to 0.965), but increased in Turkish children from 25% to 32% (OR 1.028; 95% CI 1.020 to 1.036). In Moroccan and Surinamese South Asian children, overweight rates were stable, but obesity prevalence decreased (OR 0.973; 95% CI 0.957 to 0.989, OR 0.964; 95% CI 0.943 to 0.985, respectively) as well as the mean BMI z-score (B=-0.010; 95% CI -0.014 to -0.006, B=-0.010; 95% CI -0.016 to -0.004). In Turkish children, trends limited to the period 2007-2011 showed no statistically significant relationship for all outcome measures. CONCLUSIONS: The decrease in obesity prevalence in Dutch, Moroccan and Surinamese South Asian children suggests that overweight children became less adipose. The stabilising trend in overweight and obesity prevalence in Turkish children since 2007 may signify a levelling off for this ethnic group.

Trends in overweight and obesity prevalence in Dutch, Turkish, Moroccan and Surinamese South Asian children in the Netherlands.

OBJECTIVE: To determine trends in the prevalence of overweight and obesity in children in The Hague (the Netherlands) from 1999 through 2007. DESIGN: Population-based study of a series of cross-sectional assessments of height and weight from electronic health records. SETTING: Child Health Care (Municipal Health Service), The Hague. PARTICIPANTS: 50,961 children aged 3-16 years, with Dutch (59%), Turkish (17%), Moroccan (13%) or Surinamese South Asian (11%) ethnicity, representative of the four major ethnic groups in The Hague, with 85,234 weight and height measurements recorded in 1999-2007. MAIN OUTCOME MEASURES: (Trends in) the prevalence of overweight (excluding obesity) and obesity as defined by the International Obesity Taskforce cut-off points, using logistic regression with year as independent variable. RESULTS: From 1999 through 2007 there was a decrease in the prevalence of overweight in Dutch girls from 12.6% to 10.9% (OR 0.96; 95% CI 0.95 to 0.98) and an increase in Turkish boys from 14.6% to 21.4% (OR 1.08; 95% CI 1.04 to 1.11). Obesity prevalence rose significantly in Turkish boys from 7.9% to 13.1% (OR 1.04; 95% CI 1.01 to 1.06) and in Turkish girls from 8.0% to 10.7% (OR 1.04; 95% CI 1.01 to 1.08). Dutch boys, and Moroccan and Surinamese South Asian boys and girls showed no significant trends. CONCLUSIONS: The declining prevalence of overweight in Dutch girls may indicate reversal of previous trends in the Netherlands. However, in Turkish children overweight prevalence and obesity is high and increasing. Further public health action is necessary, especially for Turkish children.