News tagged with longitudinal study
Low levels of vitamin D have been linked to depression, according to UT Southwestern Medical Center psychiatrists working with the Cooper Center Longitudinal Study. It is believed to be the largest such investigation ever ...
Health Jan 05, 2012 | 5 / 5 (5) | 0 |
In the constant battle to lose inches or at least stay the same, we reach for the diet soda. Two studies presented June 25 and 27 at the American Diabetes Association's Scientific Sessions in San Diego suggest this might ...
Health Jun 27, 2011 | 4.6 / 5 (5) | 2 |
(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 |
All fat is not created equal. Unsightly as it is, subcutaneous fat, the fat right under the skin, is not as dangerous to overall health as visceral fat, the fat deep in the belly surrounding vital organs.
Health Jun 27, 2011 | 5 / 5 (3) | 0 |
Exposure during pregnancy to flame retardant chemicals commonly found in the home is linked to lower birthweight babies, according to a new study led by researchers at the University of California, Berkeley's School of Public ...
Health Aug 30, 2011 | 5 / 5 (3) | 1 |
Students who date in middle school have significantly worse study skills, are four times more likely to drop out of school and report twice as much alcohol, tobacco and marijuana use than their single classmates, ...
Health Mar 15, 2013 | 3 / 5 (4) | 1
(Medical Xpress) -- Douglas Gentile says his own research has found both positive and negative effects from playing video games. And the Iowa State University associate professor of psychology cites examples of both in a ...
Psychology & Psychiatry Dec 28, 2011 | 2.2 / 5 (5) | 0 |
People with personality traits of high neuroticism and low conscientiousness are likely to go through cycles of gaining and losing weight throughout their lives, according to an examination of 50 years of data in a study ...
Psychology & Psychiatry Jul 18, 2011 | 5 / 5 (2) | 0 |
In the first longitudinal study of its kind, researchers at the University of Pittsburgh School of Medicine have found that 40 percent of children bereaved by sudden parental death will require intervention to prevent prolonged ...
Psychology & Psychiatry Sep 07, 2011 | 5 / 5 (2) | 2 |
School absenteeism is a significant problem, and students who are frequently absent from school more often have symptoms of psychiatric disorders. A new longitudinal study of more than 17,000 youths has found that frequently ...
Psychology & Psychiatry Dec 22, 2011 | 5 / 5 (2) | 0
Children who play with puzzles between ages 2 and 4 later develop better spatial skills, a study by University of Chicago researchers has found. Puzzle play was found to be a significant predictor of cognition after controlling ...
Psychology & Psychiatry Feb 16, 2012 | 5 / 5 (2) | 0 |
Early life emotional trauma may stunt intellectual development, indicates the first long term study of its kind, published online in the Journal of Epidemiology and Community Health.
Health Apr 02, 2012 | 5 / 5 (2) | 1 |
When a person injures their knee, it becomes inflamed. When a person has a cold, their throat becomes inflamed. This type of inflammation is the body's natural and protective response to injury.
Psychology & Psychiatry Jul 03, 2012 | 5 / 5 (2) | 0
(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 new mother may constantly worry and check to see if her baby is still breathing. Or she may fret about germs, obsessing whether she's properly sterilized the bottles, then wash and rewash them.
Psychology & Psychiatry Mar 04, 2013 | 5 / 5 (2) | 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.
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