Stephen Duffy
Dados Biográficos
| ID | 4594427 |
|---|---|
| NOME | Stephen Duffy |
| PRENOMES | Stephen |
| SOBRENOME | Duffy |
| ASSINATURA | DUFFY S |
| AFILIAÇÕES | Queen Mary University of London |
| ORCID | 0000-0003-4901-7922 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 14 |
| TOTAL DE CITAÇÕES | 18 |
| TOTAL COMO AUTOR | 14 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1987 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2025 |
| ÍNDICE H | 2 |
Understanding barriers to breast screening
These findings identify barriers that could be targeted to increase screening uptake including increasing appointment availability and proximity, reinforcing the message that breast screening is a female-only environment as well as developing interventions to reduce and manage pain during breast screening
Effectiveness of behavior change techniques to address barriers to follow-up colonoscopy
BACKGROUND: Nonattendance at colonoscopy is associated with reduced colorectal cancer (CRC) survival. PURPOSE: The aim of this research was to quantify barriers to colonoscopy and test the effectiveness of behavior change techniques (BCTs) to address them. METHODS: Two studies were conducted. In the first study, participants were asked to imagine their next CRC screening result was abnormal, and were presented with the standard abnormal result le…
Evaluation of a Faith‐Placed Health Education Service on Bowel Cancer Screening in Mosques in East London
BACKGROUND: Bowel cancer screening using faecal immunochemical testing is provided in the United Kingdom with the aim of reducing mortality from colorectal cancer. However, there are low participant rates among ethnic minorities across the United Kingdom. Faith-placed interventions have the potential to improve screening rates among such populations, but studies examining their effectiveness are scarce. METHODS: We delivered a presentation on bow…
They say it's more aggressive in black women”
Recent geographical scholarship has drawn attention to the ways in which the practice of public health constructs particular bodies and populations as “risky.” From a biopolitical perspective, this status of being “at risk” offers the basis for an emergent biosociality, groups brought together by a shared vulnerability to disease, which then forms the basis for both state‐led public health interventions and community‐driven advocacy and support. …
Fear, family and the placing of emotion
Evaluating a DVD promoting breast cancer awareness among black women aged 25–50 years in East London
BACKGROUND: The mean age of presentation for breast cancer among black women is substantially earlier than their white counterparts. Black women also present with adverse prognostic factors that have major clinical implications, including lower survival. To pilot the use of a 6 min DVD on breast cancer in young (under 50 years) black women, to raise awareness and examine the impact of the DVD on increased consultation and referral rates among the…
Avoiding bias from aggregate measures of exposure
Background: Sometimes in descriptive epidemiology or in the evaluation of a health intervention policy change, proportions exposed to a risk factor or to an intervention are used as explanatory variables in log-linear regressions for disease incidence or mortality. Aim: To demonstrate how estimates from such models can be substantially inaccurate as estimates of the effect of the risk factor or intervention at individual level. To show how the in…
Two Worlds are Ours
A simple model for potential use with a misclassified binary outcome in epidemiology
Study objective: Error in determination of disease outcome occurs in epidemiology, but such error is not usually corrected for in statistical analysis. A method of correction of risk estimates for misclassification of a binary disease outcome is developed here. Methods: The method is a simple, closed form correction to the logistic regression estimate. A closed form variance estimate is also developed. Setting: The method is illustrated in two st…
Dietary intake of soybean protein and menstrual cycle length in pre-menopausal Singapore Chinese women
Background Intake of soybean protein was associated with a reduced risk of breast cancer in a case–control study. It has also been demonstrated to increase menstrual cycle length in an experimental setting. Objective To ascertain whether the association of soybean protein intakes with menstrual cycle length persists in an uncontrolled community setting. Design Cross-sectional food frequency dietary survey, menstrual cycle survey and prospective c…
Evaluation by Markov chain models of a non-randomised breast cancer screening programme in women aged under 50 years in Sweden
STUDY OBJECTIVE: To apply Markov chain models that have previously been used on data in randomised trials of breast cancer screening to data from an uncontrolled service screening programme; to compare results with those from a randomised trial. DESIGN: A service screening programme in Uppsala county, Sweden, inviting 25,660 women aged 39-49 to mammographic screening every 20 months, and the Swedish Two-County Trial inviting 19,844 women aged 40-…
External validation, repeat determination, and precision of risk estimation in misclassified exposure data in epidemiology
STUDY OBJECTIVE--The aim was to quantify the difference in precision of risk estimates in epidemiology between the situations where misclassification of exposure is corrected for by external validation and where it is corrected for by internal repeat measurement. Precision was measured in terms of the expected width of the 95% confidence interval on the odds ratio. DESIGN--In a hypothetical case-control study, first with 100 cases and 100 control…
The Swedish two county trial of mammographic screening for breast cancer
The Swedish two county trial of breast cancer screening is now in its tenth year. This paper presents detailed results on mortality from breast cancer and from all other causes, and on the population denominators at risk for each of the first 8 years of follow up, for each county separately. These data represent a two year update on the last major report. Results show an increasingly significant deficit in deaths from breast cancer among the 77,0…
Ethnic differences in duration of pregnancy
The Swedish two county trial of mammographic screening for breast cancer
The Swedish two county trial of breast cancer screening is now in its tenth year. This paper presents detailed results on mortality from breast cancer and from all other causes, and on the population denominators at risk for each of the first 8 years of follow up, for each county separately. These data represent a two year update on the last major report. Results show an increasingly significant deficit in deaths from breast cancer among the 77,0…
They say it's more aggressive in black women”
Recent geographical scholarship has drawn attention to the ways in which the practice of public health constructs particular bodies and populations as “risky.” From a biopolitical perspective, this status of being “at risk” offers the basis for an emergent biosociality, groups brought together by a shared vulnerability to disease, which then forms the basis for both state‐led public health interventions and community‐driven advocacy and support. …
Fear, family and the placing of emotion
Evaluating a DVD promoting breast cancer awareness among black women aged 25–50 years in East London
BACKGROUND: The mean age of presentation for breast cancer among black women is substantially earlier than their white counterparts. Black women also present with adverse prognostic factors that have major clinical implications, including lower survival. To pilot the use of a 6 min DVD on breast cancer in young (under 50 years) black women, to raise awareness and examine the impact of the DVD on increased consultation and referral rates among the…
External validation, repeat determination, and precision of risk estimation in misclassified exposure data in epidemiology
STUDY OBJECTIVE--The aim was to quantify the difference in precision of risk estimates in epidemiology between the situations where misclassification of exposure is corrected for by external validation and where it is corrected for by internal repeat measurement. Precision was measured in terms of the expected width of the 95% confidence interval on the odds ratio. DESIGN--In a hypothetical case-control study, first with 100 cases and 100 control…
Ethnic differences in duration of pregnancy
The Swedish two county trial of mammographic screening for breast cancer
The Swedish two county trial of breast cancer screening is now in its tenth year. This paper presents detailed results on mortality from breast cancer and from all other causes, and on the population denominators at risk for each of the first 8 years of follow up, for each county separately. These data represent a two year update on the last major report. Results show an increasingly significant deficit in deaths from breast cancer among the 77,0…
External validation, repeat determination, and precision of risk estimation in misclassified exposure data in epidemiology
STUDY OBJECTIVE--The aim was to quantify the difference in precision of risk estimates in epidemiology between the situations where misclassification of exposure is corrected for by external validation and where it is corrected for by internal repeat measurement. Precision was measured in terms of the expected width of the 95% confidence interval on the odds ratio. DESIGN--In a hypothetical case-control study, first with 100 cases and 100 control…
Evaluation by Markov chain models of a non-randomised breast cancer screening programme in women aged under 50 years in Sweden
STUDY OBJECTIVE: To apply Markov chain models that have previously been used on data in randomised trials of breast cancer screening to data from an uncontrolled service screening programme; to compare results with those from a randomised trial. DESIGN: A service screening programme in Uppsala county, Sweden, inviting 25,660 women aged 39-49 to mammographic screening every 20 months, and the Swedish Two-County Trial inviting 19,844 women aged 40-…
Dietary intake of soybean protein and menstrual cycle length in pre-menopausal Singapore Chinese women
Background Intake of soybean protein was associated with a reduced risk of breast cancer in a case–control study. It has also been demonstrated to increase menstrual cycle length in an experimental setting. Objective To ascertain whether the association of soybean protein intakes with menstrual cycle length persists in an uncontrolled community setting. Design Cross-sectional food frequency dietary survey, menstrual cycle survey and prospective c…
A simple model for potential use with a misclassified binary outcome in epidemiology
Study objective: Error in determination of disease outcome occurs in epidemiology, but such error is not usually corrected for in statistical analysis. A method of correction of risk estimates for misclassification of a binary disease outcome is developed here. Methods: The method is a simple, closed form correction to the logistic regression estimate. A closed form variance estimate is also developed. Setting: The method is illustrated in two st…
Two Worlds are Ours
Avoiding bias from aggregate measures of exposure
Background: Sometimes in descriptive epidemiology or in the evaluation of a health intervention policy change, proportions exposed to a risk factor or to an intervention are used as explanatory variables in log-linear regressions for disease incidence or mortality. Aim: To demonstrate how estimates from such models can be substantially inaccurate as estimates of the effect of the risk factor or intervention at individual level. To show how the in…
Evaluating a DVD promoting breast cancer awareness among black women aged 25–50 years in East London
BACKGROUND: The mean age of presentation for breast cancer among black women is substantially earlier than their white counterparts. Black women also present with adverse prognostic factors that have major clinical implications, including lower survival. To pilot the use of a 6 min DVD on breast cancer in young (under 50 years) black women, to raise awareness and examine the impact of the DVD on increased consultation and referral rates among the…
Fear, family and the placing of emotion
They say it's more aggressive in black women”
Recent geographical scholarship has drawn attention to the ways in which the practice of public health constructs particular bodies and populations as “risky.” From a biopolitical perspective, this status of being “at risk” offers the basis for an emergent biosociality, groups brought together by a shared vulnerability to disease, which then forms the basis for both state‐led public health interventions and community‐driven advocacy and support. …
Evaluation of a Faith‐Placed Health Education Service on Bowel Cancer Screening in Mosques in East London
BACKGROUND: Bowel cancer screening using faecal immunochemical testing is provided in the United Kingdom with the aim of reducing mortality from colorectal cancer. However, there are low participant rates among ethnic minorities across the United Kingdom. Faith-placed interventions have the potential to improve screening rates among such populations, but studies examining their effectiveness are scarce. METHODS: We delivered a presentation on bow…
Understanding barriers to breast screening
These findings identify barriers that could be targeted to increase screening uptake including increasing appointment availability and proximity, reinforcing the message that breast screening is a female-only environment as well as developing interventions to reduce and manage pain during breast screening
Effectiveness of behavior change techniques to address barriers to follow-up colonoscopy
BACKGROUND: Nonattendance at colonoscopy is associated with reduced colorectal cancer (CRC) survival. PURPOSE: The aim of this research was to quantify barriers to colonoscopy and test the effectiveness of behavior change techniques (BCTs) to address them. METHODS: Two studies were conducted. In the first study, participants were asked to imagine their next CRC screening result was abnormal, and were presented with the standard abnormal result le…
Medicine (13 obras) · Internal Medicine (9 obras) · Cancer (7 obras) · Global Cancer Incidence and Screening (7 obras) · Internal Medicine (7 obras) · Breast cancer (5 obras) · Nursing (5 obras) · Colorectal Cancer Screening and Detection (4 obras) · Demography (4 obras) · Public health (4 obras)