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Related Concept Videos

Longitudinal Research02:20

Longitudinal Research

Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
Population Growth00:57

Population Growth

Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...
Aging01:26

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Observational Studies01:11

Observational Studies

Observational studies are a type of analytical study where researchers observe events without any interventions. In other words, the researcher does not influence the response variable or the experiment's outcome.
There are three types of observational studies – Prospective, retrospective, and cross-sectional.
Prospective Study
Prospective studies, also known as longitudinal or cohort studies, are carried out by collecting future data from groups sharing similar characteristics. One example of...
Life Tables01:22

Life Tables

A life table is a statistical tool that summarizes the mortality and survival patterns of a population, providing detailed insights into the likelihood of survival or death across different age intervals within a cohort. By organizing data on survival probabilities and mortality rates, life tables offer a clear snapshot of population dynamics over time. They are extensively used in demography, public health, actuarial science, and ecology to analyze life expectancy, design health interventions,...
Cross-Sectional Research01:50

Cross-Sectional Research

In cross-sectional research, a researcher compares multiple segments of the population at the same time. If they were interested in people's dietary habits, the researcher might directly compare different groups of people by age. Instead of following a group of people for 20 years to see how their dietary habits changed from decade to decade, the researcher would study a group of 20-year-old individuals and compare them to a group of 30-year-old individuals and a group of 40-year-old...

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Related Experiment Video

Updated: Jul 3, 2026

Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans
10:08

Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans

Published on: May 18, 2022

Prospective population survey: do centenarians change?

M V Baldelli1, L Andreetto, J M Pradelli

  • 1Department of Internal Medicine, University of Modena, Viale Vittorio Veneto, 9, l-41 100 Modena, Italy.

Archives of Gerontology and Geriatrics
|January 1, 1996
PubMed
Summary
This summary is machine-generated.

This study compared centenarian groups in 1988 and 1992, revealing significant changes in population size, dependency levels, and medication use among the elderly over four years.

Related Experiment Videos

Last Updated: Jul 3, 2026

Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans
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Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans

Published on: May 18, 2022

Area of Science:

  • Gerontology and Demography
  • Epidemiology of Aging

Background:

  • Centenarians represent a unique demographic group at the forefront of human longevity.
  • Understanding changes within this population is crucial for public health and geriatric care.
  • Previous longitudinal data on centenarian characteristics over short periods is limited.

Purpose of the Study:

  • To compare the characteristics of centenarians across two distinct sampling periods (1988 and 1992).
  • To identify demographic and health-related changes within the centenarian population over a four-year interval.
  • To provide insights into the evolving profile of the oldest old.

Main Methods:

  • Evaluation of two groups of centenarians (n=32) from the same geographic area.
  • Two sampling periods were utilized: 1988 and 1992.
  • Comparative analysis of demographic data, dependency levels, and drug utilization between the two groups.

Main Results:

  • Significant differences were observed in the number of centenarians between the two sampling periods.
  • The level of dependency among centenarians showed significant variation over the four-year study duration.
  • Patterns of drug use among centenarians were significantly different in 1992 compared to 1988.

Conclusions:

  • The centenarian population is dynamic, exhibiting changes in size and health status over relatively short periods.
  • Increased dependency and altered drug use patterns highlight evolving health needs within this age group.
  • Findings underscore the importance of ongoing monitoring and adaptive strategies for geriatric care and public health policy.