Stephen D Walter
Biographic Data
| ID | 1739874 |
|---|---|
| NAME | Stephen D Walter |
| GIVEN NAMES | Stephen D |
| FAMILY NAME | Walter |
| SIGNATURE | WALTER S D |
| AFFILIATIONS | McMaster University |
| ORCID | 0000-0003-4157-8928 |
| VERIFIED | Yes |
| TOTAL WORKS | 22 |
| TOTAL CITATIONS | 87 |
| AUTHOR COUNT | 22 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1974 |
| LATEST PUBLICATION YEAR | 2021 |
| H-INDEX | 5 |
Estimating the future cancer management costs attributable to modifiable risk factors in Canada
Estimates of future cancer mortality attributable to modifiable risk factors in Canada
Individual Participant Data Meta-Analysis of Mechanical Workplace Risk Factors and Low Back Pain
Objectives. We used individual participant data from multiple studies to conduct a comprehensive meta-analysis of mechanical exposures in the workplace and low back pain. Methods. We conducted a systematic literature search and contacted an author of each study to request their individual participant data. Because outcome definitions and exposure measures were not uniform across studies, we conducted 2 substudies: (1) to identify sets of outcome …
Comparing estimates of influenza-associated hospitalization and death among adults with congestive heart failure based on how influenza season is defined
Estimates of influenza-attributable risk may vary depending on how influenza season is defined and the outcome being assessed
The Health and Well-Being of Caregivers of Children With Cerebral Palsy
Objective. Most children enjoy healthy childhoods with little need for specialized health care services. However, some children experience difficulties in early childhood and require access to and utilization of considerable health care resources over time. Although impaired motor function is the hallmark of the cerebral palsy (CP) syndromes, many children with this development disorder also experience sensory, communicative, and intellectual imp…
Caregiving process and caregiver burden
BACKGROUND: Parental care for a child with a developmental disability is an enormous responsibility, one that can far exceed that of typical parental care. While most parents adapt well to the situation of caring for a child with a disability, some do not. To understand parents' adaptations to their children's disabilities, the complex nature of stress processes must be accounted for and the constructs and factors that play a role in the caregivi…
Relation of Distribution- and Anchor-Based Approaches in Interpretation of Changes in Health-Related Quality of Life
BACKGROUND: Approaches to interpretation of quality of life changes in clinical trials have fallen into two camps: those that rely on the distribution of changes and the Effect Size (ES), and those that use some external anchor, such as patient judgments of change, which is then used to compute a Minimally Important Difference (MID), the proportion benefiting from treatment, p(B), and the Number Needed to Treat (NNT). OBJECTIVE: To examine the re…
An Analysis of the Geographic Variation in Cancer Incidence and its Determinants in Ontario
Development and reliability of a system to classify gross motor function in children with cerebral palsy
To address the need for a standardized system to classify the gross motor function of children with cerebral palsy, the authors developed a five‐level classification system analogous to the staging and grading systems used in medicine. Nominal group process and Delphi survey consensus methods were used to examine content validity and revise the classification system until consensus among 48 experts (physical therapists, occupational therapists, a…
Walter and Colleagues Respond
Walter and Colleagues Respond Stephen D. Walter, Susan E. Birnie, Loraine D. Marrett, and S. Martin Taylor CopyRight https://doi.org/10.2105/AJPH.86.5.746-a Published Online: October 07, 2011
The geographic variation of cancer incidence in Ontario
OBJECTIVES. Our objectives were (1) to describe an analysis of the spatial pattern of cancer incidence in Ontario and (2) to discuss the quality of data in the Ontario Cancer Registry with respect to the accuracy of local cancer rates. METHODS. Cancer incidence rates were calculated for 22 cancer sites in 49 counties of Ontario during 1976 to 1986. Capture-recapture methods were used to estimate completeness of case registration, and completeness…
Psychosocial effects of PCB contamination and remediation
Modelling psychosocial effects of exposure to solid waste facilities
Psychosocial impacts in populations exposed to solid waste facilities
Measuring change over time
Evaluation of public health preschool child developmental screening
We conducted a randomized controlled trial of a public health and education screening program aimed at all 4,797 four to five year old children registering for kindergarten in three school districts of southern Ontario, Canada. Children received either the Denver Developmental Screening Test (DDST) with a community health intervention program for positive screeness; the DDST with no intervention for positive screenees; or no screening test. The i…
The usefulness of the Denver Developmental Screening Test to predict kindergarten problems in a general community population
The Denver Developmental Screening Test (DDST) was administered to 2,569 children five to seven months prior to starting kindergarten in September 1980 in a geographically well-defined community. The test was administered by trained public health nurses. At the end of the 1980-1981 school year, all 163 kindergarten teachers in the area completed a rating form for each child in their class. The rating form determined global ratings of: 1) learning…
Exact significance levels for Hewitt's test for seasonality
Hewitt proposed an easily computed test for seasonality in ranked monthly data. This paper provides a tabulation of the exact distribution of the test statistic, which previously could be estimated only from simulated data. The use of this test when ties may occur in the data is also discussed
The power of a test for seasonality
The power of a test of Edwards to detect seasonality or cyclic variation in the rate of an epidemiological event is derived and tabulated. A simple harmonic or sinusoidal form of variation is assumed, but the power results should also apply approximately to other situations with similar types of rate oscillation. The results may be used by investigators to determine the sample size required in order to detect seasonal variation of a given magnitu…
A test for seasonality of events with a variable population at risk
A statistical significance test to detect seasonality of epidemiological events is described. The method is similar to that of Edwards, but makes it possible to allow for an arbitrary pattern of variation in the population risk, and also for the unequal lengths of time sectors of a cycyle of seasons (e.g., months of a year). From the test it is possible to estimate the amplitude of seasonal variation and the time at which the maximum occurs in a …
Sex predetermination and epidemiology
The transitional effect on the sex ratio at birth of a sex predetermination program
(1974). The transitional effect on the sex ratio at birth of a sex predetermination program. Social Biology: Vol. 21, No. 4, pp. 340-352
Modelling psychosocial effects of exposure to solid waste facilities
Psychosocial impacts in populations exposed to solid waste facilities
The geographic variation of cancer incidence in Ontario
OBJECTIVES. Our objectives were (1) to describe an analysis of the spatial pattern of cancer incidence in Ontario and (2) to discuss the quality of data in the Ontario Cancer Registry with respect to the accuracy of local cancer rates. METHODS. Cancer incidence rates were calculated for 22 cancer sites in 49 counties of Ontario during 1976 to 1986. Capture-recapture methods were used to estimate completeness of case registration, and completeness…
The usefulness of the Denver Developmental Screening Test to predict kindergarten problems in a general community population
The Denver Developmental Screening Test (DDST) was administered to 2,569 children five to seven months prior to starting kindergarten in September 1980 in a geographically well-defined community. The test was administered by trained public health nurses. At the end of the 1980-1981 school year, all 163 kindergarten teachers in the area completed a rating form for each child in their class. The rating form determined global ratings of: 1) learning…
Evaluation of public health preschool child developmental screening
We conducted a randomized controlled trial of a public health and education screening program aimed at all 4,797 four to five year old children registering for kindergarten in three school districts of southern Ontario, Canada. Children received either the Denver Developmental Screening Test (DDST) with a community health intervention program for positive screeness; the DDST with no intervention for positive screenees; or no screening test. The i…
Psychosocial effects of PCB contamination and remediation
Estimates of future cancer mortality attributable to modifiable risk factors in Canada
Estimating the future cancer management costs attributable to modifiable risk factors in Canada
An Analysis of the Geographic Variation in Cancer Incidence and its Determinants in Ontario
Exact significance levels for Hewitt's test for seasonality
Hewitt proposed an easily computed test for seasonality in ranked monthly data. This paper provides a tabulation of the exact distribution of the test statistic, which previously could be estimated only from simulated data. The use of this test when ties may occur in the data is also discussed
The transitional effect on the sex ratio at birth of a sex predetermination program
(1974). The transitional effect on the sex ratio at birth of a sex predetermination program. Social Biology: Vol. 21, No. 4, pp. 340-352
A test for seasonality of events with a variable population at risk
A statistical significance test to detect seasonality of epidemiological events is described. The method is similar to that of Edwards, but makes it possible to allow for an arbitrary pattern of variation in the population risk, and also for the unequal lengths of time sectors of a cycyle of seasons (e.g., months of a year). From the test it is possible to estimate the amplitude of seasonal variation and the time at which the maximum occurs in a …
Sex predetermination and epidemiology
The power of a test for seasonality
The power of a test of Edwards to detect seasonality or cyclic variation in the rate of an epidemiological event is derived and tabulated. A simple harmonic or sinusoidal form of variation is assumed, but the power results should also apply approximately to other situations with similar types of rate oscillation. The results may be used by investigators to determine the sample size required in order to detect seasonal variation of a given magnitu…
Exact significance levels for Hewitt's test for seasonality
Hewitt proposed an easily computed test for seasonality in ranked monthly data. This paper provides a tabulation of the exact distribution of the test statistic, which previously could be estimated only from simulated data. The use of this test when ties may occur in the data is also discussed
The usefulness of the Denver Developmental Screening Test to predict kindergarten problems in a general community population
The Denver Developmental Screening Test (DDST) was administered to 2,569 children five to seven months prior to starting kindergarten in September 1980 in a geographically well-defined community. The test was administered by trained public health nurses. At the end of the 1980-1981 school year, all 163 kindergarten teachers in the area completed a rating form for each child in their class. The rating form determined global ratings of: 1) learning…
Measuring change over time
Evaluation of public health preschool child developmental screening
We conducted a randomized controlled trial of a public health and education screening program aimed at all 4,797 four to five year old children registering for kindergarten in three school districts of southern Ontario, Canada. Children received either the Denver Developmental Screening Test (DDST) with a community health intervention program for positive screeness; the DDST with no intervention for positive screenees; or no screening test. The i…
Psychosocial impacts in populations exposed to solid waste facilities
Modelling psychosocial effects of exposure to solid waste facilities
The geographic variation of cancer incidence in Ontario
OBJECTIVES. Our objectives were (1) to describe an analysis of the spatial pattern of cancer incidence in Ontario and (2) to discuss the quality of data in the Ontario Cancer Registry with respect to the accuracy of local cancer rates. METHODS. Cancer incidence rates were calculated for 22 cancer sites in 49 counties of Ontario during 1976 to 1986. Capture-recapture methods were used to estimate completeness of case registration, and completeness…
Psychosocial effects of PCB contamination and remediation
Walter and Colleagues Respond
Walter and Colleagues Respond Stephen D. Walter, Susan E. Birnie, Loraine D. Marrett, and S. Martin Taylor CopyRight https://doi.org/10.2105/AJPH.86.5.746-a Published Online: October 07, 2011
Development and reliability of a system to classify gross motor function in children with cerebral palsy
To address the need for a standardized system to classify the gross motor function of children with cerebral palsy, the authors developed a five‐level classification system analogous to the staging and grading systems used in medicine. Nominal group process and Delphi survey consensus methods were used to examine content validity and revise the classification system until consensus among 48 experts (physical therapists, occupational therapists, a…
An Analysis of the Geographic Variation in Cancer Incidence and its Determinants in Ontario
Relation of Distribution- and Anchor-Based Approaches in Interpretation of Changes in Health-Related Quality of Life
BACKGROUND: Approaches to interpretation of quality of life changes in clinical trials have fallen into two camps: those that rely on the distribution of changes and the Effect Size (ES), and those that use some external anchor, such as patient judgments of change, which is then used to compute a Minimally Important Difference (MID), the proportion benefiting from treatment, p(B), and the Number Needed to Treat (NNT). OBJECTIVE: To examine the re…
Caregiving process and caregiver burden
BACKGROUND: Parental care for a child with a developmental disability is an enormous responsibility, one that can far exceed that of typical parental care. While most parents adapt well to the situation of caring for a child with a disability, some do not. To understand parents' adaptations to their children's disabilities, the complex nature of stress processes must be accounted for and the constructs and factors that play a role in the caregivi…
The Health and Well-Being of Caregivers of Children With Cerebral Palsy
Objective. Most children enjoy healthy childhoods with little need for specialized health care services. However, some children experience difficulties in early childhood and require access to and utilization of considerable health care resources over time. Although impaired motor function is the hallmark of the cerebral palsy (CP) syndromes, many children with this development disorder also experience sensory, communicative, and intellectual imp…
Comparing estimates of influenza-associated hospitalization and death among adults with congestive heart failure based on how influenza season is defined
Estimates of influenza-attributable risk may vary depending on how influenza season is defined and the outcome being assessed
Individual Participant Data Meta-Analysis of Mechanical Workplace Risk Factors and Low Back Pain
Objectives. We used individual participant data from multiple studies to conduct a comprehensive meta-analysis of mechanical exposures in the workplace and low back pain. Methods. We conducted a systematic literature search and contacted an author of each study to request their individual participant data. Because outcome definitions and exposure measures were not uniform across studies, we conducted 2 substudies: (1) to identify sets of outcome …
Estimating the future cancer management costs attributable to modifiable risk factors in Canada
Estimates of future cancer mortality attributable to modifiable risk factors in Canada
Medicine (18 works) · Psychology (10 works) · Environmental health (8 works) · Demography (7 works) · Mathematics (7 works) · Population (7 works) · Statistics (7 works) · Psychiatry (5 works) · Cancer (4 works) · Computer Science (4 works)