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Biomedical subjects

R D Retherford

Publications and source records attributed to R D Retherford.

At least 19 recordsLinked to original sources
PubMed1999

Biomass cooking fuels and prevalence of tuberculosis in India.

OBJECTIVES: To examine the relation between use of biomass cooking fuels (wood or dung) and prevalence of active tuberculosis in India. METHODS: The analysis is based on 260,162 persons age 20 and over in India's 1992-93 National Family Health Survey. Logistic regression is used to estimate the effects of biomass fuel use on prevalence of active tuberculosis, as reported by household heads, after controlling for a number of potentially confounding variables. RESULTS: Persons living in households that primarily use biomass for cooking fuel have substantially higher prevalence of active tuberculosis than persons living in households that use cleaner fuels (odds ratio [OR] = 3.56; 95% confidence interval [CI] = 2.82-4. 50). This effect is reduced somewhat when availability of a separate kitchen, house type, indoor crowding, age, gender, urban or rural residence, education, religion, caste or tribe, and geographic region are statistically controlled (OR = 2.58; 95% CI = 1.98-3.37). Fuel type also has a large effect when the analysis is done separately for men (OR = 2.46; 95% CI = 1.79-3.39) and women (OR = 2. 74; 95% CI = 1.86-4.05) and separately for urban areas (OR = 2.29; 95% CI = 1.61-3.23) and rural areas (OR = 2.65; 95% CI = 1.74-4.03). The analysis also indicates that, among persons age 20 years and over, 51% of the prevalence of active tuberculosis is attributable to cooking smoke. CONCLUSIONS: Results strongly suggest that use of biomass fuels for cooking substantially increases the risk of tuberculosis in India.

Adult↗
PubMed1996

Values and fertility change in Japan.

This paper analyses how value change and economic and social change have jointly affected fertility in Japan since 1950, and especially since 1973 when fertility resumed declining after some 15 years at near-replacement level. The resumption of fertility decline since 1973 has been driven primarily by underlying economic and social changes. Value change has tended to lag behind fertility change, and this lag has tended to be larger in Japan than in other advanced nations, primarily because underlying economic and social conditions have evolved more rapidly in Japan, and because it takes time for values to adjust to changes in underlying conditions. Because of Japan's high degree of cultural homogeneity, values tend to be widely and quickly shared, so that under certain conditions value change tends to occur in spurts. In Japan, many of the more important value changes affecting fertility in recent decades are bound up with major educational and job gains by women, which have led to greater economic independence and more emphasis on values of individualism and equality between the sexes.

Fertility↗
PubMed1989

Ethnic differentials in early childhood mortality in Nepal.

This paper investigates the association of early childhood mortality (between birth and second birthday) with ethnicity in Nepal, based on data from the 1976 Nepal Fertility Survey, which was part of the World Fertility Survey. The approach is through a series of hazard models, which incorporate ethnicity, year of birth, mother's illiteracy, father's illiteracy, rural-urban residence, region, sex, maternal age, survival of previous birth, previous birth interval, and breast-feeding as covariates. Ethnic differentials in early childhood mortality are not explained by the other socioeconomic and demographic covariates, except for a modest effect of illiteracy, but the remaining covariates explain a great deal of variability in early childhood mortality itself. Analysis using an improved specification of breast-feeding as an age-varying covariate indicates, on average, that breast-feeding, relative to not breast-feeding, reduces age-specific mortality risks during the first 2 years of life by 76%, a very large effect.

Adolescent↗
PubMed1989

To what extent does breastfeeding explain birth-interval effects on early childhood mortality?

This article shows that in Nepal breastfeeding almost completely explains the effects of following birth interval on childhood mortality during the first 18 months of age and partially explains the effect of following birth interval on childhood mortality between 18 and 60 months of age. Breastfeeding does not explain the effect of preceding birth interval on childhood mortality. The analysis is based on application of hazard models to data from the 1976 Nepal Fertility Survey.

Birth Intervals↗
PubMed1988

Consistent correction of census and vital registration data.

A new procedure is developed for simultaneously and consistently correcting 2 or more censuses and intercensal registered births and deaths. The procedure begins with a set of preliminary correction factors, which are not necessarily consistent. It then uses the mathematics of finite-dimensional vector spaces to derive an optimal set of final consistent correction factors. The optimization procedure is based on the principle that there exists in a hyperplane a unique point of minimum distance from a fixed point not in the hyperplane. For purposes of illustration, the procedure is applied to the censuses of 1970, 1975, and 1980 and intercensal registered births and deaths for the periods 1970-1975 and 1975-1980 for the Republic of Korea.

Asia↗