PUB 540 Describe the characteristics and design of a cohort study

PUB 540 Describe the characteristics and design of a cohort study

PUB 540 Describe the characteristics and design of a cohort study

As discussed by Friis & Sellers (2020) a cohort study is an observational study that goes from cause to effect. It is a longitudinal study that follows a group of subjects over time. The exposure of a particular disease is known to be positive and how the effects of this positive exposure manifest are observed. There are two points of observation, before disease onset and then at a follow up. By doing this, a measure of effect that certain risk factors related to disease outcome. This is the best type of study for population-based studies because more measures of association can be evaluated. This is an observational study versus an experimental study because no intervention is included; the aim is to simply observe cause and effect in a certain group to determine the incidence of disease, mortality rates among this group, which then can serve as a flag for the need for more resources to prevent high numbers of untoward outcomes.

Hoepner et al., (2016) participated in a cohort study that looks at the association between bisphenol A and adiposity in the inner city. Prenatal mothers had their BPA concentrations measures (n =375), children aged 3 (n=408), and children 5 years (n=518). The children in age groups 3 and 5 had their urine spot tested. The children were followed up every 3 months and followed till they were 5 years of age, and then every 6 months until 7 years of age. The mothers were followed differently during their pregnancy. They wanted to see if there was an association between higher BPA concentration before birth and adiposity. There was a positive association that high prenatal concentrations of BPA were associated with adiposity by age 7.

 

References

 

Hoepner, L. A., Whyatt, R. M., Widen, E. M., Hassoun, A., Oberfeld, S. E., Mueller, N. T., Diaz, D., Calafat, A. M., Perera, F. P., & Rundle, A. G. (2016). Bisphenol A and Adiposity in an Inner-City Birth Cohort. Environmental Health Perspectives124(10), 1644–1650. https://doi-org.lopes.idm.oclc.org/10.1289/EHP205

 

Friis, R. H., & Sellers, T. (2020). Epidemiology for public health practice (6th ed.). Jones & Bartlett Learning.

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One of the most influential tools used in epidemiology is a cohort study.  According to the Center for Disease Control and Prevention reports the exposure and those who are unexposed to the disease of interest and tracks the participants to determine if they contract the disease of interest.  In the words of Friis and Sellers cohort studies are observational, and longitudinal study that begins with people who have not been exposed but have a harmful outcome.

The 2020 KH Topic I choose to discuss the “Prospective Cohort Study of Mental Health During Imprisonment”.  The aim of the scientific study was to determine how early detention or imprisonment of individuals can affect one’s mental health.  This was accomplished by screening 3079 prisoners and examining their psychiatric symptoms ( Hassan, Harty, Jarrett, Jones, King, Lathlean, Lowthian, Mills, Thornicroft, Web,  2011). (DOI: 10.1192/bjp.bp.110.080333).

Approximately 978 prisoners exhibited psychiatric symptoms as early as the first week of incarceration.  Those who remained in prison had follow-up interviews recorded at one and two. The results yielded data that depicted those psychiatric symptoms are prevalent during the first week of incarceration, but the presence tends to decline over a period. The overall study can be classified as observational because of the method used to collect data and type of data retrieved.

 

References:

 

Hassan L, Birmingham L, Harty MA, Jarrett M, Jones P, King C, Lathlean J, Lowthian C, Mills A, Senior J, Thornicroft G, Webb R, Shaw J. (2011). Prospective cohort study of mental health during imprisonment. Br J Psychiatry 198(1), 37-42. DOI: 10.1192/bjp.bp.110.080333

 

Setia M. S. (2016). Methodology Series Module 1: Cohort Studies. Indian journal of dermatology61(1), 21–25. https://doi.org/10.4103/0019-5154.174011

According to Himmelfarb.gwu.edu (2019) cohort study is a design where one or more samples (called cohorts) are followed prospectively and subsequent status evaluations with respect to a disease or outcome are conducted to determine which initial participants exposure characteristics (risk factors) are associated with it.

The health condition I have identified is environmental quality. Healthypeople.gov (2022) discusses how the Air

PUB 540 Describe the characteristics and design of a cohort study
PUB 540 Describe the characteristics and design of a cohort study

Quality Index (AQI) reports daily air quality from a value of 0 to 500, considers values greater than 100 to indicate unhealthy levels of air pollution. It was reported that between 2006–2008 and 2016-2018, potential exposure to unhealthy air quality (measured as the number of AQI-weighted people days) decreased 43%, from 7.603 to 4.296 billion, exceeding the HP2020 target (Healthypeople.gov, 2022).

The link to the article is https://www.healthypeople.gov/2020/leading-health-indicators/2020-lhi-topics/Environmental-Quality/data

As stated on Healthypeople.gov (2022) between 2005–2008 and 2013-2016, exposure to secondhand smoke among children aged 3–11 years was conducted and it was discovered that there was a decrease of 27.0%, from 52.2% to 38.1%, exceeding the HP2020 target. In 2013-2016, several groups of children in specific demographic categories had the lowest rates of secondhand smoke exposure, including Asian children, those born outside the U.S., those with private health insurance, and those in families with incomes at 500% or more of the poverty threshold (Healthypeople.gov, 2022).

Friis & Sellers (2021) explain that a cohort study as an observational study design makes use of careful measurement of patterns of exposure and disease in populations to draw inferences about etiology while an experiment study design would be impractical and, in some instances, unethical.

References

Friis, R.H. & Sellers, T.A. (2021). Epidemiology for public health practice (6th ed.). Burlington,

MA: Jones & Bartlett Learning.

Healthypeople.gov (2022). Environmental Quality. Retrieved from https://www.healthypeople.gov/2020/leading-health-indicators/2020-lhi-topics/Environmental-Quality/data

Himmelfarb.gwu.edu (2019). Study Design 101. Retrieved from https://himmelfarb.gwu.edu/tutorials/studydesign101/cohorts.cfm#:~:text=Definition,factors)%20are%20associated%20with%20it.

According to Himmelfarb.gwu.edu (2019) cohort study is a design where one or more samples (called cohorts) are followed prospectively and subsequent status evaluations with respect to a disease or outcome are conducted to determine which initial participants exposure characteristics (risk factors) are associated with it.

The health condition I have identified is environmental quality. Healthypeople.gov (2022) discusses how the Air Quality Index (AQI) reports daily air quality from a value of 0 to 500, considers values greater than 100 to indicate unhealthy levels of air pollution. It was reported that between 2006–2008 and 2016-2018, potential exposure to unhealthy air quality (measured as the number of AQI-weighted people days) decreased 43%, from 7.603 to 4.296 billion, exceeding the HP2020 target (Healthypeople.gov, 2022).

The link to the article is https://www.healthypeople.gov/2020/leading-health-indicators/2020-lhi-topics/Environmental-Quality/data

As stated on Healthypeople.gov (2022) between 2005–2008 and 2013-2016, exposure to secondhand smoke among children aged 3–11 years was conducted and it was discovered that there was a decrease of 27.0%, from 52.2% to 38.1%, exceeding the HP2020 target. In 2013-2016, several groups of children in specific demographic categories had the lowest rates of secondhand smoke exposure, including Asian children, those born outside the U.S., those with private health insurance, and those in families with incomes at 500% or more of the poverty threshold (Healthypeople.gov, 2022).

Friis & Sellers (2021) explain that a cohort study as an observational study design makes use of careful measurement of patterns of exposure and disease in populations to draw inferences about etiology while an experiment study design would be impractical and, in some instances, unethical.

References

Friis, R.H. & Sellers, T.A. (2021). Epidemiology for public health practice (6th ed.). Burlington,

MA: Jones & Bartlett Learning.

Healthypeople.gov (2022). Environmental Quality. Retrieved from https://www.healthypeople.gov/2020/leading-health-indicators/2020-lhi-topics/Environmental-Quality/data

Himmelfarb.gwu.edu (2019). Study Design 101. Retrieved from https://himmelfarb.gwu.edu/tutorials/studydesign101/cohorts.cfm#:~:text=Definition,factors)%20are%20associated%20with%20it.