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Prevalence of diabetes and ethnic differences in cardiovascular risk factors. The 1992 Singapore National Health Survey

Tan CE, Emmanuel SC, Tan BY, Jacob E

Diabetes Care, 1999 Feb;22(2):241-7.
PMID: 10333940 DOI: 10.2337/diacare.22.2.241

OBJECTIVE: The purpose of the 1992 Singapore National Health Survey was to determine the current distribution of major noncommunicable diseases and their risk factors, including the prevalence of diabetes and dyslipidemia, in Singapore.

RESEARCH DESIGN AND METHODS: A combination of disproportionate stratified sampling and systematic sampling were used to select the sample for the survey. The final number of respondents was 3,568, giving a response rate of 72.6%. All subjects fasted for 10 h and were given a 75-g glucose load, except those known to have diabetes. Blood was taken before and 2 h after the glucose load. Diagnosis of diabetes was based on 2-h glucose alone.

RESULTS: The age-standardized prevalence of diabetes in Singapore residents aged 18-69 years was 8.4%, with more than half (58.5%) previously undiagnosed. Prevalence of diabetes was high across all three ethnic groups. The prevalence of impaired glucose tolerance was 16.1%, that of hypertension was 6.5%, and 19.0% were regular smokers. The total cholesterol (mean +/- SD) of nondiabetic Singaporeans was 5.18 +/- 1.02 mmol/l; 47.9% had cholesterol > 5.2 mmol/l, while 15.4% had levels > 6.3 mmol/l. Mean LDL cholesterol was 3.31 +/- 0.89 mmol/l; HDL cholesterol was 1.30 +/- 0.32 mmol/l, and triglyceride was 1.23 +/- 0.82 mmol/l.

CONCLUSIONS: Prevalence of diabetes was high across all three ethnic groups. Ethnic differences in prevalence of diabetes, insulin resistance, central obesity, hypertension, smoking, and lipid profile could explain the differential coronary heart disease rates in the three major ethnic groups in Singapore.
Fulltext Small intestinal absorption studies and biopsy findings in Asians, in Singapore

Jayaratnam FJ, Tan KK, Jacob E, Seah CS, Kho KM

Singapore Med J, 1970 Dec;11(4):275-82.
PMID: 5511860

Investigations in 30 healthy control subjects of Indian, Chinese and Malay ethnic origin, revealed that all the Chinese and about two thirds of the Indians and Malays had a normal capacity to absorb D—xylose, Vitamin A, Co58 labelled Vitamin B12 and dietary fat. About a third of the Indians and Malays were unable to absorb one or two of the four test substances used in the absorption studies. Jejunal biopsies did not differ in the 3 ethnic groups and were normal or mildly abnormal. 27 patients presenting with anorexia, a sore tongue and pallor were also investigated. Indians formed the majority of the patients. Diarrhoea occurred in only 51 % of the patients. All had a megaloblastic anaemia. Absorption studies revealed malabsorption of xylose, Vitamin A and Vitamin B12 in the majority but steatorrhoea occurred in only 26% of the patients. Jejunal biopsies were mildly abnormal in 8% and moderately or severely abnormal in 92 % of the patients. All responded to folic acid or Vitamin B12 therapy. 16 patients were restudied after 5 to 24 months therapy and the majority were found to have improved. Results of investigations and response to therapy indicate that these patients were suffering from tropical sprue. These studies indicate that tropical sprue in Singapore affects Indians mainly and can often present without diarrhoea and steatorrhoea.
A genomic history of Aboriginal Australia

Malaspinas AS, Westaway MC, Muller C, Sousa VC, Lao O, Alves I, et al.

Nature, 2016 Oct 13;538(7624):207-214.
PMID: 27654914 DOI: 10.1038/nature18299

The population history of Aboriginal Australians remains largely uncharacterized. Here we generate high-coverage genomes for 83 Aboriginal Australians (speakers of Pama-Nyungan languages) and 25 Papuans from the New Guinea Highlands. We find that Papuan and Aboriginal Australian ancestors diversified 25-40 thousand years ago (kya), suggesting pre-Holocene population structure in the ancient continent of Sahul (Australia, New Guinea and Tasmania). However, all of the studied Aboriginal Australians descend from a single founding population that differentiated ~10-32 kya. We infer a population expansion in northeast Australia during the Holocene epoch (past 10,000 years) associated with limited gene flow from this region to the rest of Australia, consistent with the spread of the Pama-Nyungan languages. We estimate that Aboriginal Australians and Papuans diverged from Eurasians 51-72 kya, following a single out-of-Africa dispersal, and subsequently admixed with archaic populations. Finally, we report evidence of selection in Aboriginal Australians potentially associated with living in the desert.
Fulltext Burden of injury along the development spectrum: associations between the Socio-demographic Index and disability-adjusted life year estimates from the Global Burden of Disease Study 2017

Haagsma JA, James SL, Castle CD, Dingels ZV, Fox JT, Hamilton EB, et al.

Inj Prev, 2020 Oct;26(Supp 1):i12-i26.
PMID: 31915273 DOI: 10.1136/injuryprev-2019-043296

BACKGROUND: The epidemiological transition of non-communicable diseases replacing infectious diseases as the main contributors to disease burden has been well documented in global health literature. Less focus, however, has been given to the relationship between sociodemographic changes and injury. The aim of this study was to examine the association between disability-adjusted life years (DALYs) from injury for 195 countries and territories at different levels along the development spectrum between 1990 and 2017 based on the Global Burden of Disease (GBD) 2017 estimates.
METHODS: Injury mortality was estimated using the GBD mortality database, corrections for garbage coding and CODEm-the cause of death ensemble modelling tool. Morbidity estimation was based on surveys and inpatient and outpatient data sets for 30 cause-of-injury with 47 nature-of-injury categories each. The Socio-demographic Index (SDI) is a composite indicator that includes lagged income per capita, average educational attainment over age 15 years and total fertility rate.
RESULTS: For many causes of injury, age-standardised DALY rates declined with increasing SDI, although road injury, interpersonal violence and self-harm did not follow this pattern. Particularly for self-harm opposing patterns were observed in regions with similar SDI levels. For road injuries, this effect was less pronounced.
CONCLUSIONS: The overall global pattern is that of declining injury burden with increasing SDI. However, not all injuries follow this pattern, which suggests multiple underlying mechanisms influencing injury DALYs. There is a need for a detailed understanding of these patterns to help to inform national and global efforts to address injury-related health outcomes across the development spectrum.