Timothy B Gage

Biographic Data

ID3581052
NAMETimothy B Gage
GIVEN NAMESTimothy B
FAMILY NAMEGage
SIGNATUREGAGE T B
AFFILIATIONSUniversity at Albany, State University of New York
VERIFIEDNo
TOTAL WORKS47
TOTAL CITATIONS261
AUTHOR COUNT47
EDITOR COUNT0
FIRST PUBLICATION YEAR1979
LATEST PUBLICATION YEAR2016
H-INDEX10

  • Heterogeneity identified at birth and blood pressure in adulthood

    Open AccessTimothy B Gage, Furrina F Lee et al.ARTICLEAmerican Journal of Human Biology2016

    OBJECTIVE: In the developmental programming literature, the association of birth weight and blood pressure later in life is modest at best. This article reexamines this issue using Covariate Density Defined mixture of regressions (CDDmr) to determine if a latent variable, based on birth weight, and known to influence infant mortality, provides a stronger indicator of developmental programming. METHODS: CDDmr identifies two latent components in th…

  • Social Networks and the Heritability of Migratory Behavior

    Jeffrey S Napierala, Timothy Gage et al.ARTICLEBiodemography and Social Biology2016References: 16

    A small but growing body of literature examines the relationship between genetics and human migration. These studies suggest that some DRD4 alleles, particularly 7R+, are related to migration. This is surprising from a sociological perspective, which views migration largely as a product of social and economic forces. However, social relationships with migrants, which have been theorized to influence migration by providing access to migration-spec…

  • The effect of intra‐uterine growth restriction on blood lipids and response to exercise training

    Open AccessJessica G Redmond, Timothy B Gage et al.ARTICLEAmerican Journal of Human Biology2013

    An 8-week exercise program corrected some, but not all, of the differences in blood lipid values between the LOWPI and HIGHPI group. The persistent group difference in blood lipid ratios suggests a higher long-term risk of chronic disease in the LOWPI group independent of lifestyle intervention

  • Maternal Education, Birth Weight, and Infant Mortality in the United States

    Open AccessTimothy B Gage, Fu Fang et al.ARTICLEDemography2013Cited by: 14References: 30

    This research determines whether the observed decline in infant mortality with socioeconomic level, operationalized as maternal education (dichotomized as college or more, versus high school or less), is due to its “indirect” effect (operating through birth weight) and/or to its “direct” effect (independent of birth weight). The data used are the 2001 U.S. national African American, Mexican American, and European American birth cohorts by sex. Th…

  • Demography Part 1: Mortality and Migration

    Timothy B Gage, N Dewitte et al.OTHERHuman Biology2012

    This chapter contains sections titled: Introduction Demographic Rates and their Estimation Mortality Migration Chapter Summary Acknowledgments References Cited Recommended Readings

  • Birth-Weight-Specific Infant and Neonatal Mortality: Effects of Heterogeneity in the Birth Cohort

    Timothy B GageARTICLEHuman Biology2009

    Birth-weight-specific infant mortality is examined using a novel statistical procedure, parametric mixtures of logistic regressions. The results indicate that birth cohorts are composed of two or more subpopulations that are heterogeneous with respect to infant mortality. One subpopulation appears to account for the “normal” process of fetal development, while the other, which accounts for the majority of births at both low and high birth weights…

  • Birth-Weight-Specific Infant and Neonatal Mortality: Effects of Heterogeneity in the Birth Cohort

    Timothy B GageARTICLEHuman Biology2009

    Birth-weight-specific infant mortality is examined using a novel statistical procedure, parametric mixtures of logistic regressions. The results indicate that birth cohorts are composed of two or more subpopulations that are heterogeneous with respect to infant mortality. One subpopulation appears to account for the "normal" process of fetal development, while the other, which accounts for the majority of births at both low and high birth weights…

  • Update to Gage and O'Connor's “Nutrition and the Variation in Level and Age Patterns of Mortality” (1994)

    Timothy B Gage, Kathleen O’connor et al.ARTICLEHuman Biology2009

    It is widely assumed that nutrition influences the level of mortality. However, the association of nutrition and mortality is not linear; improved nutrition is associated with lower mortality when infectious causes of death dominate, but overnutrition, particularly with respect to the consumption of carbohydrates and fats, is often associated with increased chronic disease mortality. It is also possible that nutrition influences the age patterns …

  • Update to Gage and O'Connor's "Nutrition and the Variation in Level and Age Patterns of Mortality" (1994)

    Timothy B Gage, Kathleen O’connor et al.ARTICLEHuman Biology2009

    Update to Gage and O'Connor's "Nutrition and the Variation in Level and Age Patterns of Mortality" (1994) Timothy B. Gage and Kathleen O'Connor Keywords Nutrition, Mortality, Dietary Components, Age Patterns of Mortality. It is widely assumed that nutrition influences the level of mortality. However, the association of nutrition and mortality is not linear; improved nutrition is associated with lower mortality when infectious causes of death domi…

  • Nutrition and the Variation in Level and Age Patterns of Mortality

    Timothy B Gage, Kathleen O’connor et al.ARTICLEHuman Biology2009References: 1

    We examine the associations between nutrition and mortality at the national level. Altogether four aspects of this association are explored: (1) total calories with expectation of life, (2) dietary composition with expectation of life, (3) total calories with the age patterns of mortality, and (4) dietary composition with the age patterns of mortality. The data consist of life tables and national food balance sheets for 341 populations from 96 co…

  • Update to Gage's “Birth-Weight-Specific Infant and Neonatal Mortality” (2002)

    Timothy B GageARTICLEHuman Biology2009

  • Update to Gage's "Birth-Weight-Specific Infant and Neonatal Mortality" (2002)

    Timothy B GageARTICLEHuman Biology2009

    Update to Gage's "Birth-Weight-Specific Infant and Neonatal Mortality" (2002) Timothy B. Gage Keywords Birth Weight, Infant Mortality, Gestational Age, pediatric paradox, maternal age Fryer et al. (1984), Gage and Therriault (1998), and Gage (2000) show that a two-component Gaussian mixture model describes the birth-weight distribution very well and gestational age distribution reasonably well. This finding led to the hypothesis that one of the s…

  • What Do We Know about the Agricultural Demographic Transition

    Timothy B Gage, N Dewitte et al.ARTICLECurrent Anthropology2009Cited by: 27References: 29

    The Agricultural Revolution accompanied, either as a cause or as an effect, important changes in human demographic systems. The consensus model is that fertility and mortality increased and health declined with the adoption of agriculture, compared to those for hunter-gatherers. Analysis of the agricultural transition relies primarily on archaeological and paleodemographic data and is thus subject to the errors associated with such data. The assu…

  • Modeling the pediatric paradox: Birth weight by gestational age

    Timothy B Gage, Fu Fang et al.ARTICLEBiodemography and Social Biology2008References: 27

    The "pediatric paradox" of African versus European American infant mortality is often observed with respect to birth weight, but rarely to gestational age, even though the two measures are biologically related. This paper models the pediatric paradox by birth weight and gestational age simultaneously, using Covariate Density Defined mixture of logistic regressions (CDDmlr) fitted to 1985-1988 New York State births. The model controls for unobserv…

  • Multiple mortality optima due to heterogeneity in the birth cohort: A continuous model of birth weight by gestational age‐specific infant mortality

    Open AccessFu Fang, Howard Stratton et al.ARTICLEAmerican Journal of Human Biology2007

    Birth weight and gestational age are both important predictors of infant survival. Covariate Density Defined mixture of logistic regressions (CDDmlr), a method that accounts for unobserved heterogeneity, has been applied to birth outcomes using birth weight alone. This paper investigates a CDDmlr model of birth outcomes that includes birth weight and gestational age. Applications to four birth cohorts, composed of all non‐Hispanic singleton Afric…

  • Are Modern Environments Really Bad for Us: Revisiting the Demographic and Epidemiologic Transitions

    Open AccessTimothy B GageARTICLEAmerican Journal of Physical…2005Cited by: 20References: 47

    It is a common assumption that agriculture and modernization have been detrimental for human health. The theoretical argument is that humans are adapted to hunter-gatherer lifestyles, and that the agricultural and "modern" environments are novel and hence likely to be detrimental. In particular, changes in nutrition, and population size and distribution with the adoption of agriculture, are considered to increase the risk of infectious disease mo…

  • Has the transition to agriculture reshaped the demographic structure of prehistoric populations? New evidence from the Levant

    Open AccessVered Eshed, Avi Gopher et al.ARTICLEAmerican Journal of Physical…2004Cited by: 27References: 39

    This paper presents the demographic changes that followed the transition from a hunting‐gathering way of life (Natufian) to an agricultural, food‐producing economy (Neolithic) in the southern Levant. The study is based on 217 Natufian (10,500–8,300 BC) skeletons and 262 Neolithic (8,300–5,500 BC) skeletons. Age and sex identification were carried out, and life tables were constructed. A five‐parameter competing hazard model developed by Siler ([ …

  • Pediatric Paradox: Heterogeneity in the Birth Cohort

    Timothy B Gage, Michael Bauer et al.ARTICLEHuman Biology2004Cited by: 6

    Comparisons of birth-weight-specific infant mortality indicate that low-birth-weight African American infants have lower mortality than low-birth-weight European American infants despite higher infant mortality overall-the "pediatric paradox." One explanation is heterogeneity in birth weight. Analyses of African American and European American births suggest that birth cohorts consist of two heterogeneous subpopulations. One appears to account for…

  • Classification of births by birth weight and gestational age: An application of multivariate mixture models

    Open AccessTimothy B GageARTICLEAnnals of Human Biology2003

    Multivariate Gaussian mixture models provide a method of identifying compromised births that is not dependent upon arbitrary standards

  • The Evolution of Human Phenotypic Plasticity: Age and Nutritional Status at Maturity

    Timothy B GageARTICLEHuman Biology2003Cited by: 5References: 7

    Several evolutionary optimal models of human plasticity in age and nutritional status at reproductive maturation are proposed and their dynamics examined. These models differ from previously published models because fertility is not assumed to be a function of body size or nutritional status. Further, the models are based on explicitly human demographic patterns, that is, model human life-tables, model human fertility tables, and, a nutrient flow…

  • Modeling birthweight and gestational age distributions: Additive vs. multiplicative processes

    Open AccessTimothy B GageARTICLEAmerican Journal of Human Biology2002

    Researchers have traditionally employed Gaussian distributions to model quantitative biological traits. Recently, mixtures of Gaussian distributions have begun to be used as well. However, there are many alternatives to the Gaussian distribution. From a theoretical perspective, the lognormal distribution is as applicable as the Gaussian (both are justified on the basis of the Central Limit Theorem). Here, the utility of mixtures of Gaussians and …

  • Genetic and environmental correlations between various anthropometric and blood pressure traits among adult Samoans

    Open AccessAudrey C Choh, Timothy B Gage et al.ARTICLEAmerican Journal of Physical…2001Cited by: 8References: 18

    Shared polygenic effects (i.e., pleiotropy) are assumed to exist for such obesity‐related phenotypes as blood pressure and adiposity. It is possible to identify these shared genetic effects through bivariate genetic analyses. This analysis of 1,342 adult Samoans, across 801 pedigrees, indicates that significant heritable components ( P

  • Variability of gestational age distributions by sex and ethnicity: An analysis using mixture models

    Open AccessTimothy B GageARTICLEAmerican Journal of Human Biology2000

  • Variability of gestational age distributions by sex and ethnicity: An analysis using mixture models

    Open AccessTimothy B GageARTICLEAmerican Journal of Human Biology2000

    As an antecedent of birthweight and in its own right, gestational age is an important proximate determinant of infant mortality. Recent analyses using mixture models of birthweight distributions suggest that substantial heterogeneity occurs within a birth cohort even when controlling for sex and ethnicity. This article extends the mixture model analysis to gestational age. The results indicate that, like birthweight, human gestational age distrib…

  • Biodemography in Anthropological Studies, volume dedicated to Gabriel W. Lasker

    Open AccessTimothy B GageARTICLEAmerican Journal of Human Biology1999