News tagged with longitudinal study
(Medical Xpress)—Want a good night's sleep? Be positive – consistently. Although happiness is generally good for sleeping, when a person's happiness varies a lot in reaction to daily ups and downs, sleep suffers, reports ...
Health Apr 29, 2013 | 5 / 5 (4) | 0 |
(Medical Xpress)—Children who have an earlier onset of puberty have poorer mental health from as early as preschool age, a new study by Murdoch Childrens Research Institute has found.
Psychology & Psychiatry Apr 02, 2013 | 5 / 5 (2) | 0 |
Bullied children grow into adults who are at increased risk of developing anxiety disorders, depression and suicidal thoughts, according to a study led by researchers at Duke Medicine.
Psychology & Psychiatry Feb 20, 2013 | 5 / 5 (1) | 0 |
New research at the University of Chicago and the University of North Carolina at Chapel Hill shows that children begin to show signs of higher-level thinking skills as young as age 4 ½. Researchers have previously attributed ...
Psychology & Psychiatry Jan 23, 2013 | 5 / 5 (1) | 0 |
The 4D scans of 15 healthy fetuses, by Durham and Lancaster Universities, also suggest that yawning is a developmental process which could potentially give doctors another index of a fetus' health.
Medical research Nov 21, 2012 | not rated yet | 1 |
(Medical Xpress)—Yale School of Medicine researchers have found that children born to mothers who smoked more than one pack per day during pregnancy struggled on tests designed to measure how accurately ...
Pediatrics Nov 19, 2012 | 5 / 5 (2) | 0 |
A mother's age at menopause may predict her daughter's fertility in terms of the numbers of eggs remaining in her ovaries, according to the new research published online in Europe's leading reproductive medicine journal Human Re ...
Medical research Nov 06, 2012 | not rated yet | 0 |
(Medical Xpress)—Being stuck in a crowd of a million people doesn't sound like much fun, but according to the latest research, being with others – even during difficult conditions - can actually be good for well-being.
Psychology & Psychiatry Oct 19, 2012 | 5 / 5 (1) | 0 |
(Medical Xpress)—Researchers investigating a known gene risk factor for Alzheimer's disease discovered it is associated with lower levels of beta amyloid—a brain protein involved in Alzheimer's—in cognitively healthy ...
Neuroscience Oct 02, 2012 | 5 / 5 (1) | 0 |
Being physically fit during your 30s, 40s, and 50s not only helps extend lifespan, but it also increases the chances of aging healthily, free from chronic illness, investigators at UT Southwestern Medical Center and The Cooper ...
Health Aug 27, 2012 | 5 / 5 (1) | 0 |
Regardless of how much a high school student generally studies each day, if that student sacrifices sleep in order to study more than usual, he or she is more likely to have academic problems the following day. Because students ...
Health Aug 21, 2012 | not rated yet | 0 |
(HealthDay) -- Adherence to a Mediterranean dietary pattern in early life is associated with lower arterial stiffness in adulthood, according to a study published online July 19 in the Journal of Internal Me ...
Health Jul 31, 2012 | 5 / 5 (1) | 0 |
A simple drawing test can predict the long-term risk of dying after a first stroke among older men, finds research published in the online journal BMJ Open.
Cardiology May 09, 2012 | 5 / 5 (1) | 0 |
(Medical Xpress) -- Preschool children who are more physically active are more likely to show behavioural problems, a study has found.
Psychology & Psychiatry May 07, 2012 | 5 / 5 (1) | 0 |
High levels of vitamin D do not seem to boost teens' academic performance, indicates research published online in the Journal of Epidemiology and Community Health.
Health Apr 11, 2012 | not rated yet | 0 |
A longitudinal study is a correlational research study that involves repeated observations of the same items over long periods of time — often many decades. It is a type of observational study. Longitudinal studies are often used in 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, longitudinal studies track the same people, and therefore the differences observed in those people are less likely to be the result of cultural differences across generations. Because of this benefit, longitudinal studies make observing changes more accurate and they are applied in various other fields. In medicine, the design is used to uncover predictors of certain diseases. In advertising, the Communicus System, 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.
Because 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 do experiments. But 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 by virtue of observing the temporal order of events.
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 not possible to conclude which of these possibilities is the case using one-off cross-sectional studies.
Types of longitudinal studies include cohort studies and panel studies. Cohort studies sample a cohort, defined as a group experiencing some event (typically birth) in a selected time period, and studying them at intervals through time. Panel studies sample a cross-section, and survey it at (usually regular) intervals.
A retrospective study is a longitudinal study that looks back in time. For instance a researcher may look up the medical records of previous years to look for a trend.
For more information about Longitudinal study, read the full article at
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