Robert W Platt
Datos Biográficos
| ID | 4514923 |
|---|---|
| NOMBRE | Robert W Platt |
| NOMBRES | Robert W |
| APELLIDO | Platt |
| FIRMA | PLATT R W |
| AFILIACIONES | McGill University |
| ORCID | 0000-0002-5981-8443 |
| VERIFICADO | Sí |
| TOTAL DE OBRAS | 21 |
| TOTAL DE CITAS | 28 |
| TOTAL COMO AUTOR | 21 |
| TOTAL COMO EDITOR | 0 |
| PRIMER AÑO DE PUBLICACIÓN | 2001 |
| AÑO MÁS RECIENTE DE PUBLICACIÓN | 2020 |
| ÍNDICE H | 3 |
Hypertensive Disorders of Pregnancy and Medication Use in the 2015 Pelotas (Brazil) Birth Cohort Study
Hypertensive disorders of pregnancy account for approximately 22% of all maternal deaths in Latin America and the Caribbean. Pharmacotherapies play an important role in preventing and reducing the occurrence of adverse outcomes. However, the patterns of medications used for treating women with hypertensive disorders of pregnancy (HDP) living in this country is unclear. A population-based birth cohort study including 4262 women was conducted to de…
Associations of prenatal urinary phthalate exposure with preterm birth
An Evaluation of Healthcare Use and Child Morbidity 4 Years After User Fee Removal in Rural Burkina Faso
Objectives Increasing financial access to healthcare is proposed to being essential for improving child health outcomes, but the available evidence on the relationship between increased access and health remains scarce. Four years after its launch, we evaluated the contextual effect of user fee removal intervention on the probability of an illness occurring and the likelihood of using health services among children under 5. We also explored the p…
Using perinatal morbidity scoring tools as a primary study outcome
Perinatal morbidity scores are tools that score or weight different adverse events according to their relative severity. Perinatal morbidity scores are appealing for maternal–infant health researchers because they provide a way to capture a broad range of adverse events to mother and newborn while recognising that some events are considered more serious than others. However, they have proved difficult to implement as a primary outcome in applied …
Development and Validation of a Predictive Equation for Lean Body Mass in Children and Adolescents
The equations estimate LBM accurately from simple anthropometric measures
Illustrating bias due to conditioning on a collider
That conditioning on a common effect of exposure and outcome may cause selection, or collider-stratification, bias is not intuitive. We provide two hypothetical examples to convey concepts underlying bias due to conditioning on a collider. In the first example, fever is a common effect of influenza and consumption of a tainted egg-salad sandwich. In the second example, case-status is a common effect of a genotype and an environmental factor. In b…
Do gastrointestinal tract infections in infancy increase blood pressure in childhood? A cohort study
BACKGROUND: It has been hypothesised that dehydration in infancy could permanently increase sodium retention, raising blood pressure in later life. In this study, the association between gastrointestinal tract infection in infancy, a clinically relevant exposure often accompanied by dehydration, and raised blood pressure in childhood was investigated. METHODS: Data from a cohort study nested within a cluster-randomised trial of breastfeeding prom…
Overadjustment Bias and Unnecessary Adjustment in Epidemiologic Studies
Overadjustment is defined inconsistently. This term is meant to describe control (eg, by regression adjustment, stratification, or restriction) for a variable that either increases net bias or decreases precision without affecting bias. We define overadjustment bias as control for an intermediate variable (or a descending proxy for an intermediate variable) on a causal path from exposure to outcome. We define unnecessary adjustment as control for…
Challenges in measuring changes in health and social indicators over time
The paper by Mortensen et al 1 raises important questions in the study of time trends in fetal growth and other exposures and outcomes. Fetal growth is usually measured by birthweight for gestational age, and small for gestational age (SGA), typically defined using a percentile cut-off point of the weight for gestational age distribution, is a commonly used outcome in perinatal epidemiology studies.2 SGA is also considered an important risk facto…
Reducing bias through directed acyclic graphs
BACKGROUND: The objective of most biomedical research is to determine an unbiased estimate of effect for an exposure on an outcome, i.e. to make causal inferences about the exposure. Recent developments in epidemiology have shown that traditional methods of identifying confounding and adjusting for confounding may be inadequate. DISCUSSION: The traditional methods of adjusting for "potential confounders" may introduce conditional associations and…
Do mother’s education and foreign born status interact to influence birth outcomes? Clarifying the epidemiological paradox and the healthy migrant effect
INTRODUCTION: The unresolved "epidemiological paradox" concerns the association between low socioeconomic status and unexpectedly favourable birth outcomes in foreign born mothers. The "healthy migrant" effect concerns the association between foreign born status per se and birth outcomes. The epidemiological paradox and healthy migrant effect were analysed for newborns in a favourable sociopolitical environment. METHODS: 98,330 live births to mot…
The importance of social networks in their association to drug equipment sharing among injection drug users
Aim To examine the scientific evidence regarding the association between characteristics of social networks of injection drug users (IDUs) and the sharing of drug injection equipment. Methods A search was performed on MEDLINE, EMBASE, BIOSIS, Current Contents, PsycINFO databases and other sources to identify published studies on social networks of IDUs. Papers were selected based on their examination of social network factors in relation to the s…
Social Network-Related Risk Factors for Bloodborne Virus Infections Among Injection Drug Users Receiving Syringes through Secondary Exchange
Refugee and Refugee-claimant Women and Infants Post-birth
Comparison between Children with Juvenile Idiopathic Arthritis (JIA) and their Parents Concerning Perceived Quality of Life
The Influence of Display and Statistical Factors on the Interpretation of Metaanalysis Results by Physicians
OBJECTIVE: The objective of this study was to determine the extent to which various factors affect the interpretation of metaanalytic results by physicians. STUDY DESIGN: A sample of 120 physicians, selected from The Royal College of Physicians and Surgeons of Canada (RCPSC), was randomly assigned to 1 of 6 groups (n = 20) created from a combination of 3 summary measures and 2 levels of disease severity. The intervention consisted of a written sc…
Family Environment and Emotional and Behavioural Symptoms in Adolescent Cambodian Refugees
For young refugees, the turmoil of adolescence is exacerbated by the acculturation process that sometimes places them at odds with the traditional culture of their ethnic group. The family environment can affect how adolescents cross that pivotal period. This paper focuses on the influence of family environment, gender and acculturation on the mental health of young refugees from early to mid-adolescence. Sixty-seven Cambodian adolescents were fo…
My Place, Your Place, or a Safer Place
Trends in Emergency Department Reported Head and Neck Injuries Among Skiers and Snowboarders
Socio‐economic disparities in preterm birth
Preterm birth is the leading cause of infant mortality in industrialised societies. Its incidence is greatly increased among the socially disadvantaged, but the reasons for this excess are unclear and have been relatively unexplored. We hypothesise two distinct sets of causal pathways and mechanisms that may explain social disparities in preterm birth. The first set involves chronic and acute psychosocial stressors, psychological distress caused …
A New and Improved Population-Based Canadian Reference for Birth Weight for Gestational Age
BACKGROUND: Existing fetal growth references all suffer from 1 or more major methodologic problems, including errors in reported gestational age, biologically implausible birth weight for gestational age, insufficient sample sizes at low gestational age, single-hospital or other non-population-based samples, and inadequate statistical modeling techniques. METHODS: We used the newly developed Canadian national linked file of singleton births and i…
Refugee and Refugee-claimant Women and Infants Post-birth
Using perinatal morbidity scoring tools as a primary study outcome
Perinatal morbidity scores are tools that score or weight different adverse events according to their relative severity. Perinatal morbidity scores are appealing for maternal–infant health researchers because they provide a way to capture a broad range of adverse events to mother and newborn while recognising that some events are considered more serious than others. However, they have proved difficult to implement as a primary outcome in applied …
Do mother’s education and foreign born status interact to influence birth outcomes? Clarifying the epidemiological paradox and the healthy migrant effect
INTRODUCTION: The unresolved "epidemiological paradox" concerns the association between low socioeconomic status and unexpectedly favourable birth outcomes in foreign born mothers. The "healthy migrant" effect concerns the association between foreign born status per se and birth outcomes. The epidemiological paradox and healthy migrant effect were analysed for newborns in a favourable sociopolitical environment. METHODS: 98,330 live births to mot…
Social Network-Related Risk Factors for Bloodborne Virus Infections Among Injection Drug Users Receiving Syringes through Secondary Exchange
Challenges in measuring changes in health and social indicators over time
The paper by Mortensen et al 1 raises important questions in the study of time trends in fetal growth and other exposures and outcomes. Fetal growth is usually measured by birthweight for gestational age, and small for gestational age (SGA), typically defined using a percentile cut-off point of the weight for gestational age distribution, is a commonly used outcome in perinatal epidemiology studies.2 SGA is also considered an important risk facto…
My Place, Your Place, or a Safer Place
Associations of prenatal urinary phthalate exposure with preterm birth
Socio‐economic disparities in preterm birth
Preterm birth is the leading cause of infant mortality in industrialised societies. Its incidence is greatly increased among the socially disadvantaged, but the reasons for this excess are unclear and have been relatively unexplored. We hypothesise two distinct sets of causal pathways and mechanisms that may explain social disparities in preterm birth. The first set involves chronic and acute psychosocial stressors, psychological distress caused …
A New and Improved Population-Based Canadian Reference for Birth Weight for Gestational Age
BACKGROUND: Existing fetal growth references all suffer from 1 or more major methodologic problems, including errors in reported gestational age, biologically implausible birth weight for gestational age, insufficient sample sizes at low gestational age, single-hospital or other non-population-based samples, and inadequate statistical modeling techniques. METHODS: We used the newly developed Canadian national linked file of singleton births and i…
Trends in Emergency Department Reported Head and Neck Injuries Among Skiers and Snowboarders
Family Environment and Emotional and Behavioural Symptoms in Adolescent Cambodian Refugees
For young refugees, the turmoil of adolescence is exacerbated by the acculturation process that sometimes places them at odds with the traditional culture of their ethnic group. The family environment can affect how adolescents cross that pivotal period. This paper focuses on the influence of family environment, gender and acculturation on the mental health of young refugees from early to mid-adolescence. Sixty-seven Cambodian adolescents were fo…
My Place, Your Place, or a Safer Place
The Influence of Display and Statistical Factors on the Interpretation of Metaanalysis Results by Physicians
OBJECTIVE: The objective of this study was to determine the extent to which various factors affect the interpretation of metaanalytic results by physicians. STUDY DESIGN: A sample of 120 physicians, selected from The Royal College of Physicians and Surgeons of Canada (RCPSC), was randomly assigned to 1 of 6 groups (n = 20) created from a combination of 3 summary measures and 2 levels of disease severity. The intervention consisted of a written sc…
Comparison between Children with Juvenile Idiopathic Arthritis (JIA) and their Parents Concerning Perceived Quality of Life
The importance of social networks in their association to drug equipment sharing among injection drug users
Aim To examine the scientific evidence regarding the association between characteristics of social networks of injection drug users (IDUs) and the sharing of drug injection equipment. Methods A search was performed on MEDLINE, EMBASE, BIOSIS, Current Contents, PsycINFO databases and other sources to identify published studies on social networks of IDUs. Papers were selected based on their examination of social network factors in relation to the s…
Social Network-Related Risk Factors for Bloodborne Virus Infections Among Injection Drug Users Receiving Syringes through Secondary Exchange
Refugee and Refugee-claimant Women and Infants Post-birth
Reducing bias through directed acyclic graphs
BACKGROUND: The objective of most biomedical research is to determine an unbiased estimate of effect for an exposure on an outcome, i.e. to make causal inferences about the exposure. Recent developments in epidemiology have shown that traditional methods of identifying confounding and adjusting for confounding may be inadequate. DISCUSSION: The traditional methods of adjusting for "potential confounders" may introduce conditional associations and…
Do mother’s education and foreign born status interact to influence birth outcomes? Clarifying the epidemiological paradox and the healthy migrant effect
INTRODUCTION: The unresolved "epidemiological paradox" concerns the association between low socioeconomic status and unexpectedly favourable birth outcomes in foreign born mothers. The "healthy migrant" effect concerns the association between foreign born status per se and birth outcomes. The epidemiological paradox and healthy migrant effect were analysed for newborns in a favourable sociopolitical environment. METHODS: 98,330 live births to mot…
Overadjustment Bias and Unnecessary Adjustment in Epidemiologic Studies
Overadjustment is defined inconsistently. This term is meant to describe control (eg, by regression adjustment, stratification, or restriction) for a variable that either increases net bias or decreases precision without affecting bias. We define overadjustment bias as control for an intermediate variable (or a descending proxy for an intermediate variable) on a causal path from exposure to outcome. We define unnecessary adjustment as control for…
Challenges in measuring changes in health and social indicators over time
The paper by Mortensen et al 1 raises important questions in the study of time trends in fetal growth and other exposures and outcomes. Fetal growth is usually measured by birthweight for gestational age, and small for gestational age (SGA), typically defined using a percentile cut-off point of the weight for gestational age distribution, is a commonly used outcome in perinatal epidemiology studies.2 SGA is also considered an important risk facto…
Illustrating bias due to conditioning on a collider
That conditioning on a common effect of exposure and outcome may cause selection, or collider-stratification, bias is not intuitive. We provide two hypothetical examples to convey concepts underlying bias due to conditioning on a collider. In the first example, fever is a common effect of influenza and consumption of a tainted egg-salad sandwich. In the second example, case-status is a common effect of a genotype and an environmental factor. In b…
Do gastrointestinal tract infections in infancy increase blood pressure in childhood? A cohort study
BACKGROUND: It has been hypothesised that dehydration in infancy could permanently increase sodium retention, raising blood pressure in later life. In this study, the association between gastrointestinal tract infection in infancy, a clinically relevant exposure often accompanied by dehydration, and raised blood pressure in childhood was investigated. METHODS: Data from a cohort study nested within a cluster-randomised trial of breastfeeding prom…
Development and Validation of a Predictive Equation for Lean Body Mass in Children and Adolescents
The equations estimate LBM accurately from simple anthropometric measures
Using perinatal morbidity scoring tools as a primary study outcome
Perinatal morbidity scores are tools that score or weight different adverse events according to their relative severity. Perinatal morbidity scores are appealing for maternal–infant health researchers because they provide a way to capture a broad range of adverse events to mother and newborn while recognising that some events are considered more serious than others. However, they have proved difficult to implement as a primary outcome in applied …
An Evaluation of Healthcare Use and Child Morbidity 4 Years After User Fee Removal in Rural Burkina Faso
Objectives Increasing financial access to healthcare is proposed to being essential for improving child health outcomes, but the available evidence on the relationship between increased access and health remains scarce. Four years after its launch, we evaluated the contextual effect of user fee removal intervention on the probability of an illness occurring and the likelihood of using health services among children under 5. We also explored the p…
Hypertensive Disorders of Pregnancy and Medication Use in the 2015 Pelotas (Brazil) Birth Cohort Study
Hypertensive disorders of pregnancy account for approximately 22% of all maternal deaths in Latin America and the Caribbean. Pharmacotherapies play an important role in preventing and reducing the occurrence of adverse outcomes. However, the patterns of medications used for treating women with hypertensive disorders of pregnancy (HDP) living in this country is unclear. A population-based birth cohort study including 4262 women was conducted to de…
Associations of prenatal urinary phthalate exposure with preterm birth
Medicine (17 obras) · Environmental health (9 obras) · Internal Medicine (8 obras) · Mathematics (6 obras) · Pediatrics (6 obras) · Population (6 obras) · Pregnancy (6 obras) · Statistics (6 obras) · Internal Medicine (5 obras) · Pediatrics (5 obras)