Related Experiment Video
Updated: Mar 21, 2026
07:56
Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts
Published on: January 29, 2018
18.5K
Disappearing seasonality in birthweight
1Department of Economics, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, South Korea.
Summary
Seasonal birth weight differences in South Korea have nearly vanished. Babies born in winter were heaviest and summer-born lightest, but this trend diminished significantly over time.
Area of Science:
- Human biology
- Epidemiology
- Perinatal health
Background:
- Birth weight seasonality has been observed globally.
- Factors influencing seasonal birth weight trends require further investigation.
Purpose of the Study:
- To estimate birth weight seasonality in South Korea from 1997-2014.
- To assess changes in birth weight seasonality over this period.
Main Methods:
- Analysis of 8,268,693 full-term singletons born in South Korea.
- Regression analysis of birth weight by birth season, controlling for covariates.
- Year-by-year analysis to track trends in seasonality.
Main Results:
- Pooled analysis showed winter births had the highest birth weight (approx. 11g difference).
- Seasonality in birth weight significantly decreased over the study period.
- By the end of 2014, seasonal birth weight patterns had largely disappeared.
Conclusions:
- The influence of factors causing birth weight seasonality has diminished in South Korea.
- Further research in other countries is needed to confirm these findings.
- This study highlights potential shifts in environmental or social factors affecting fetal development.
More Related Videos
10:46A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
Published on: December 9, 2015
11.2K
04:20Author Spotlight: Exploring Microglial Interactions with Stress-Response Circuitry Using the Limited Bedding and Nesting Model
Published on: July 12, 2024
2.8K
Related Concept Videos
01:52Regression Toward the Mean
7.3K
Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when...
7.3K
01:26Derivatives: Problem Solving
143
Temperature-Dependent Growth of Brook TroutThe growth of brook trout is closely influenced by water temperature. Experimental data demonstrate how trout weight changes over a 24-day period in response to varying water temperatures. At lower temperatures, such as 15.5 degrees Celsius, brook trout show significant weight gain. However, as the temperature increases, the amount of weight gained steadily decreases. At the highest temperature measured, 24.4 degrees Celsius, trout experience a net...
143
01:11Normal Distribution
18.1K
The normal, a continuous distribution, is the most important of all the distributions. Its graph is a bell-shaped symmetrical curve, which is observed in almost all disciplines. Some of these include psychology, business, economics, the sciences, nursing, and, of course, mathematics. Some instructors may use the normal distribution to help determine students’ grades. Most IQ scores are normally distributed. Often real-estate prices fit a normal distribution. The normal distribution is...
18.1K
01:17z Scores and Area Under the Curve
20.1K
z scores are the standardized values obtained after converting a normal distribution into a standard normal distribution. A z score is measured in units of the standard deviation. The z score tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a z score of...
20.1K
00:51Energy Budgets
11.1K
Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
11.1K
02:45Biological Clocks and Seasonal Responses
42.0K
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
42.0K