Longitudinal study




A longitudinal study (or longitudinal survey, or panel study) is a research design that involves repeated observations of the same variables (e.g., people) over short or long periods of time (i.e., uses longitudinal data). It is often a type of observational study, although they can also be structured as longitudinal randomized experiments.[1]


Longitudinal studies are often used in social-personality and clinical psychology, to study rapid fluctuations in behaviors, thoughts, and emotions from moment to moment or day to day; in developmental psychology, to study developmental trends across the life span; and in sociology, to study life events throughout lifetimes or generations. The reason for this is that, unlike cross-sectional studies, in which different individuals with the same characteristics are compared,[2] longitudinal studies track the same people, and so the differences observed in those people are less likely to be the result of cultural differences across generations. Longitudinal studies thus make observing changes more accurate and are applied in various other fields. In medicine, the design is used to uncover predictors of certain diseases. In advertising, the design is used to identify the changes that advertising has produced in the attitudes and behaviors of those within the target audience who have seen the advertising campaign. Longitudinal studies allow social scientists to distinguish short from long-term phenomena, such as poverty. If the poverty rate is 10% at a point in time, this may mean that 10% of the population are always poor or that the whole population experiences poverty for 10% of the time. It is impossible to conclude which of these possibilities is the case by using one-off cross-sectional studies.[citation needed]


When longitudinal studies are observational, in the sense that they observe the state of the world without manipulating it, it has been argued that they may have less power to detect causal relationships than experiments. However, because of the repeated observation at the individual level, they have more power than cross-sectional observational studies, by virtue of being able to exclude time-invariant unobserved individual differences and also of observing the temporal order of events.[3] Some of the disadvantages of longitudinal study are that they take a lot of time and are very expensive. Therefore, they are not very convenient.[4]


Longitudinal studies can be retrospective (looking back in time, thus using existing data such as medical records or claims database) or prospective (requiring the collection of new data).[citation needed]


Cohort studies are one type of longitudinal study which sample a cohort (a group of people who share a defining characteristic, typically who experienced a common event in a selected period, such as birth or graduation) and perform cross-section observations at intervals through time. However, not all longitudinal studies are cohort studies, as longitudinal studies can instead include a group of people who do not share a common event.[5]




Contents






  • 1 Examples


  • 2 See also


  • 3 References


  • 4 External links





Examples




























































































































































































































































































































































































































































































Study name
Type
Country or region
Year started
Participants
Remarks

45 and Up Study
Cohort
Australia
2006
267,153
The 45 and Up Study is a longitudinal study of participants aged 45 years and over in New South Wales conducted by the Sax Institute. Researchers are able to analyse Study data linked to MBS and PBS data, the NSW cancer registry, State hospitalisations and emergency department visits and mortality data.

The Study is used by both researchers and policy makers to better understand how Australians are ageing and using health services to prevent and manage ill-health and disability and guide health system decisions. 45 and Up is the largest ongoing study of healthy ageing in the Southern Hemisphere.



Alzheimer's Disease Neuroimaging Initiative
Panel
International
2004
n/a


Australian Longitudinal Study on Women's Health (ALSWH)
Cohort
Australia
1996
50,000
Includes four cohorts of women: born between 1921 and 1926, 1946–1951, 1973–1978 and 1989–1995
The Jyväskylä Longitudinal Study of Personality and Social Development,[6] (JYLS)
Cohort
Finland
1968
369
The sample was drawn from 12 complete school classes. Data has been collected when the participants were 8, 14, 20, 27, 33, 36, 42 and 50 years old.
Building a New Life in Australia : The Longitudinal Study of Humanitarian Migrants (BNLA)[7][8]
Cohort
Australia
2013
2399
a longitudinal study of the settlement experience of humanitarian arrivals in Australia
Colombian Longitudinal Survey by Universidad de los Andes (ELCA)[9]
Panel
Colombia
2010
15,363[10]
Follows rural and urban households for increasing the comprehension of social and economic changes in Colombia

Avon Longitudinal Study of Parents and Children (ALSPAC)
Cohort
United Kingdom
1991
14,000


Born in Bradford
Cohort
United Kingdom
2007
12,500


1970 British Cohort Study (BCS70)
Cohort
United Kingdom
1970
17,000
Monitors the development of babies born in the UK in one particular week in April 1970

British Doctors Study
Cohort
United Kingdom
1951
40,701
Monitored the health of British male doctors. It provided convincing evidence of the link between smoking and cancer.

British Household Panel Survey
Panel
United Kingdom
1991
n/a
Modeled on the US PFID study
Busselton Health Study[11]
Panel
Australia
1966
10,000


Caerphilly Heart Disease Study
Cohort
United Kingdom
1979
2,512
Male subjects (Wales)
Canadian Longitudinal Study on Aging (CLSA-ÉLCV)[12]
Cohort
Canada
2012
1,000
Planned as a 20-year study.[13]
Child Development Project[14]
Cohort
United States
1987
585
Follows children recruited the year before they entered kindergarten in three US cities: Nashville and Knoxville, Tennessee, and Bloomington, Indiana

Children of Immigrants Longitudinal Study (CILS)
Cohort
United States
1992
5,262
Florida

Congenital Heart Surgeons' Society (CHSS)
Cohort
Canada

5,000
Various studies, managed by the Data Center Studies on Congenital Heart Diseases

Dunedin Multidisciplinary Health and Development Study
Cohort
New Zealand
1972
1,037
Participants born in Dunedin during 1972–73
Study of migrants and squatters in Rio's Favelas
Cohort
Brazil
1968
n/a
The work of Janice Perlman, reported in her book Favela (2014)[15]
Footprints in Time; the longitudinal study of Indigenous children[16]
Cohort
Australia
2008
1680
Study of Aboriginal and Torres Strait Islander children in selected locations across Australia

Fragile Families and Child Wellbeing Study
Cohort
United States
1998
n/a
Study being conducted in 20 cities

Framingham Heart Study
Cohort
United States
1948
5,209
Massachusetts

Genetic Studies of Genius
Cohort
United States
1921
1,528
The world's oldest and longest-running longitudinal study

Socio-Economic Panel (SOEP)
Panel
Germany
1984
12,000

Growing Up in Scotland (GUS)
Cohort
United Kingdom
2003
14,000[17]
Scotland

Health and Retirement Study
Cohort
United States
1988
22,000


Household, Income and Labour Dynamics in Australia Survey
Panel
Australia
2001
25,000


Grant Study
Cohort
United States
1939
268
A 75-year longitudinal study of 268 physically and mentally healthy Harvard college sophomores from the classes of 1939–1944.
Growing Up in Australia; the longitudinal study of Australian children[18]
Cohort
Australia
2004
10,000


Luxembourg Income Study (LIS)
Cohort
International
1983
n/a
30 countries
Midlife in the United States
Cohort
United States
1983
6,500


Manitoba Follow-Up Study (MFUS)
Cohort
Canada
1948
3,983 men
Canada's largest and longest running investigation of cardiovascular disease and successful aging

Millennium Cohort Study (MCS)
Cohort
United Kingdom
2000
19,000
Study of child development, social stratification and family life

Millennium Cohort Study
Cohort
United States
2000
200,000
Evaluation of long-term health effects of military service, including deployments

Minnesota Twin Family Study
Cohort
United States
1983
17,000 (8,500 twin pairs)


National Child Development Study (NCDS)
Cohort
United Kingdom
1958
17,000


National Longitudinal Surveys (NLS)
Cohort
United States
1979
NLSY79-12,686, NLSY97-approx. 9000
Includes four cohorts: NLSY79 (born 1957–64), NLSY97 (born 1980–84), NLSY79 Children and Young Adults, National Longitudinal Surveys of Young Women and Mature Women (NLSW)

National Longitudinal Survey of Children and Youth (NLSCY)
Cohort
Canada
1994
35,795
Inactive since 2009

National Health and Nutrition Examination Survey (NHANES)
Cohort
United States
1971
8,837 (since 1999)
Continual since 1999

Pacific Islands Families Study
Cohort
New Zealand
2000
1,398

Panel Study of Belgian Households[20]
Panel
Belgium
1992
11,000[21]


Panel Study of Income Dynamics
Panel
United States
1968
70,000
Possibly the oldest household longitudinal survey in the US

Rotterdam Study
Cohort
Netherlands
1990
15,000
Focus is on inhabitants of Ommoord, a suburb of Rotterdam

Seattle 500 Study
Cohort
United States
1974
500
Study of the effects of prenatal health habits on human development
Stirling County Study
Cohort
Canada
1952
639
Long-term study epidemiology of psychiatric disorders. Two cohorts were studied (575 from 1952-1970; 639 from 1970-1992).[22]

Study of Health in Pomerania
Cohort
Germany
1997
15,000
Investigates common risk factors, sub-clinical disorders and manifest diseases in a high-risk population

Study of Mathematically Precocious Youth
Cohort
United States
1972
5,000
Follows highly intelligent people identified by age 13.

Survey of Health, Ageing and Retirement in Europe (SHARE)
Panel
Europe
2002
120,000
Multidisciplinary and cross-national panel database of micro data on health, socio-economic status and social and family networks of individuals aged 50 or over

Irish Longitudinal Study on Ageing (TILDA)
Cohort
Ireland
2009
8,500
Studies health, social and financial circumstances of older Irish population

New Zealand Attitudes and Values Study

New Zealand
2009
n/a


Seattle Longitudinal Study
Cohort
United States
1956
6,000 [23]


Understanding Society: The UK Household Longitudinal Study
Panel
United Kingdom
2009
100,000
Incorporates the British Household Panel Survey

Up Series
Cohort
United Kingdom
1964
14
Documentary film project by Michael Apted

Study on Global Ageing and Adult Health (SAGE)
Cohort
International
2002
65,964
Studies the health and well-being of adult populations and the ageing process in six countries: China, Ghana, India, Mexico, Russian Federation and South Africa
Wisconsin Longitudinal Study[24]
Cohort
United States
1957
10,317
Follows graduates from Wisconsin high schools in 1957
ONS Longitudinal Study[25]
Panel
England and Wales
1974 (data from 1971)
1% sample of the population of England and Wales. The LS contains records on over 500,000 people usually resident in England and Wales at each point in time
The sample comprises people born on one of four selected dates of birth and therefore makes up about 1% of the total population. The sample was initiated at the time of the 1971 Census, and the four dates were used to update the sample at the 1981,1991 2001 and 2011 Censuses and in routine event registrations. Fresh LS members enter the study through birth and immigration and existing members leave through death and emigration.

Thus, the LS represents a continuous sample of the population of England and Wales, rather than a sample taken at one time point only. It now includes records for over 950,000 study members.


In addition to the census records, the individual LS records contain data for events such as deaths, births to sample mothers, emigrations and cancer registrations.


Census information is also included for all people living in the same household as the LS member. However, it is important to emphasise that the LS does not follow up household members in the same way from census to census.


Support for potential users and more information available at CeLSIUS


Scottish Longitudinal Study (SLS)[26]
Panel
Scotland
1991
The Scottish Longitudinal Study comprises 5.3% sample of the Scottish population, holds records on approximately 274,000 individuals using 20 random birthdates.
The SLS is a large-scale linkage study built upon census records from 1991 onwards, with links to vital events (births, deaths, marriages, emigration); geographical and ecological data (deprivation indices, pollution, weather); primary and secondary education data (attendance, Schools Census, qualifications); and links to NHS Scotland ISD datasets, including cancer registrations, maternity records, hospital admissions, prescribing data and mental health admissions. The research potential is considerable. The SLS is a replica of the ONS Longitudinal Study but with a few key differences: sample size, commencement point and the inclusion of certain variables.

The SLS is supported and maintained by the SLS Development & Support Unit with a safe-setting at the National Records of Scotland in Edinburgh.


Further information and support for potential users is available at SLS-DSU


Northern Ireland Longitudinal Study (NILS)[27]
Panel
Northern Ireland
2006
The Northern Ireland Longitudinal Study comprises about 28% of the Northern Ireland population (approximately 500,000 individuals and approximately 50% of households).
The NILS is a large-scale, representative data-linkage study created by linking data from the Northern Ireland Health Card Registration system to the 1981, 1991, 2001 and 2011 census returns and to administrative data from other sources. These include vital events registered with the General Register Office for Northern Ireland (such as births, deaths and marriages) and the Health Card registration system migration events data. The result is a 30-year-plus longitudinal data set which is regularly being updated. In addition to this rich resource there is also the potential to link further Health and Social care data via distinct linkage projects (DLPs).

The NILS is designed for statistics and research purposes only and is managed by the Northern Ireland Statistics and Research Agency under Census legislation. The data are de-identified at the point of use; access is only from within a strictly controlled ‘secure environment’ and governed by protocols and procedures to ensure data confidentiality.




See also



  • Cross-sectional study

  • Time series

  • Repeated measures design



References





  1. ^ Shadish, William R.; Cook, Thomas D.; Campbell, Donald T. (2002). Experimental and Quasi-Experimental Designs for Generalized Causal Inference (2nd ed.). Boston: Houghton Mifflin Company. p. 267. ISBN 0-395-61556-9..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}


  2. ^ Carlson, Neil and et al. "Psychology the Science of Behavior", p. 361. Pearson Canada, United States of America


  3. ^ van der Krieke, L., Blaauw, F.J., Emerencia, A.C., Schenk, H.M., Slaets, J., Bos, E.H., de Jonge, P., Jeronimus, B.F. (2016). "Temporal Dynamics of Health and Well-Being: A Crowdsourcing Approach to Momentary Assessments and Automated Generation of Personalized Feedback". Psychosomatic Medicine: 1. doi:10.1097/PSY.0000000000000378. PMID 27551988.CS1 maint: Multiple names: authors list (link)


  4. ^ Cherry, Kendra. "What Is Longitudinal Research?". experiments. About.com guide. Retrieved 22 February 2012.


  5. ^ "What is the difference between a Panel Study and a Cohort Study?". Academia Stack Exchange. Retrieved 3 February 2016.


  6. ^ FSD. "Jyväskylä Longitudinal Study of Personality and Social Development (JYLS)". www.fsd.uta.fi. Retrieved 2017-03-30.


  7. ^ "Building a New Life in Australia (BNLA): The Longitudinal Study of Humanitarian Migrants – Department of Social Services, Australian Government". Retrieved 1 December 2016.


  8. ^ "Building a New Life in Australia (BNLA): The Longitudinal Study of Humanitarian Migrants – Department of Social Services, Australian Government". Retrieved 1 December 2016.


  9. ^ Colombian Longitudinal Survey by Universidad de los Andes (ELCA)


  10. ^ Encuesta Longitudinal Colombiaba de la Universidad de los Andes – ELCA 2013


  11. ^ "Busselton Health Study – Past Projects – BPMRI". Retrieved 1 December 2016.


  12. ^ "Canadian Longitudinal Study on Aging – Canadian Longitudinal Study on Aging". Retrieved 1 December 2016.


  13. ^ Teotonio, Isabel (24 April 2012). "Landmark study on aging to follow 50,000 Canadians over the next two decades". Toronto Life. Toronto Star Newspapers Ltd. Retrieved 28 July 2014.


  14. ^ "Child Development Project – Developmental Pathways to Adjustment and Well-being in Early Adulthood – Center for Child & Family Policy – Duke University". Retrieved 1 December 2016.


  15. ^ Favela: Longitudinal Multi-Generational Study of migrants and squatters in Rio’s Favelas, 1968-2014


  16. ^ "Overview of Footprints in Time – The Longitudinal Study of Indigenous Children (LSIC) – Department of Social Services, Australian Government". Retrieved 1 December 2016.


  17. ^ Growing Up in Scotland, Study design


  18. ^ Studies, Australian Institute of Family. "Growing Up in Australia: The Longitudinal Study of Australian Children (LSAC) – Australian Institute of Family Studies (AIFS)". Retrieved 1 December 2016.


  19. ^ "Manitoba Follow-up Study – About The Study". Retrieved 1 December 2016.


  20. ^ Panel Study of Belgian Households


  21. ^ Panel Study of Belgian Households, Survey summary


  22. ^ Murphy JM, Laird NM, Monson RR, Sobol AM, Leighton AH (May 2000). "Incidence of depression in the Stirling County Study: historical and comparative perspectives". Psychol. Med. 30 (30(3)): 505–14. PMID 10883707.CS1 maint: Multiple names: authors list (link)


  23. ^ "About the Seattle Longitudinal Study". Retrieved 1 December 2016.


  24. ^ "Wisconsin Longitudinal Study Homepage". Retrieved 1 December 2016.


  25. ^ ONS Longitudinal Study


  26. ^ "Home :: SLS – Scottish Longitudinal Study Development & Support Unit". Retrieved 1 December 2016.


  27. ^ "Queen's University Belfast – NILS Research Support Unit – NILS Research Support Unit". Retrieved 1 December 2016.




External links



  • ESDS Longitudinal data service

  • Centre for Longitudinal Studies

  • National Centre for Longitudinal Data










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