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Original Articles
Joint Association of Screen Time and Physical Activity with Obesity: Findings from the Korea Media Panel Study
Jihyung Shin
Osong Public Health Res Perspect. 2018;9(4):207-212.   Published online August 31, 2018
DOI: https://doi.org/10.24171/j.phrp.2018.9.4.10
  • 6,123 View
  • 83 Download
  • 6 Citations
AbstractAbstract PDF
Objectives

There is evidence to suggest that sedentary behavior is associated with a higher risk of metabolic disease. The aim of this study was to investigate cross-sectional joint associations of physical activity (PA) and screen time (ST), with the risk of obesity in Korean adults.

Methods

The Korea Media Panel Study consisted of a household interview and a self-administered diary survey on media usage over 3 days. ST (hours/day) was defined as the reported daily average hours spent watching television, computing (i.e., desktop, notebook, netbook, tablets), smartphone and video game console use. Cross-sectional associations of obesity (BMI ≥ 25 kg/m2) and the amount of daily ST and PA were examined by logistic regression models adjusting for other possible confounders including alcohol consumption, smoking, depressive symptoms and demographic information. There were 7,808 participants included in the analyses.

Results

Increased ST was significantly associated with the risk of obesity (controlling for other possible confounders), but PA level was not found to be significantly linked. Participants who engaged in screen time > 6 hours per day had a higher incidence of obesity.

Conclusion

This study provides evidence of the association between ST and the increased incidence of obesity measured by BMI, independent of PA amongst Korean adults.

The Determinants of Research and Development Investment in the Pharmaceutical Industry: Focus on Financial Structures
Munjae Lee, Mankyu Choi
Osong Public Health Res Perspect. 2015;6(5):302-309.   Published online October 31, 2015
DOI: https://doi.org/10.1016/j.phrp.2015.10.013
  • 1,452 View
  • 14 Download
  • 15 Citations
AbstractAbstract PDF
Objectives
This study analyzes the influence of the financial structure of pharmaceutical companies on R&D investment to create a next-generation profit source or develop relatively cost-effective drugs to maximize enterprise value.
Methods
The period of the empirical analysis is from 2000 to 2012. Financial statements and comments in general and internal transactions were extracted from TS-2000 of the Korea Listed Company Association (KLCA), and data related to stock price is extracted from KISVALUE-Ⅲ of NICE Information Service Co., Ltd. Stata 12.0 was used as the statistical package for panel analysis.
Results
The current ratio had a positive influence on R&D investment, the debt ratio had a negative influence on R&D investment, and return on investment and net sales growth rate did not have a significant influence on R&D investment.
Conclusion
It was found in this study that the higher liquidity ratio, the greater the R&D investment. The stability of pharmaceutical companies has a negative influence on R&D investment. This finding is consistent with the prediction that if a company faces a financial risk, it will be passive in R&D investment due to its financial difficulties.
Impact of Corporate Governance on Research and Development Investment in the Pharmaceutical Industry in South Korea
Munjae Lee
Osong Public Health Res Perspect. 2015;6(4):249-255.   Published online August 31, 2015
DOI: https://doi.org/10.1016/j.phrp.2015.07.003
  • 1,389 View
  • 18 Download
  • 3 Citations
AbstractAbstract PDF
Objectives
The purpose of this study is to analyze the influence of the corporate governance of pharmaceutical companies on research and development (R&D) investment.
Methods
The period of the empirical analysis is from 2000 to 2012. Financial statements and comments in general, and internal transactions were extracted from TS-2000 of the Korea Listed Company Association. Sample firms were those that belong to the medical substance and drug manufacturing industries. Ultimately, 786 firm-year data of 81 firms were included in the sample (unbalanced panel data).
Results
The shareholding ratio of major shareholders and foreigners turned out to have a statistically significant influence on R&D investment (p < 0.05). No statistical significance was found in the shareholding ratio of institutional investors and the ratio of outside directors.
Conclusion
The higher the shareholding ratio of the major shareholders, the greater the R&D investment. There will be a need to establish (or switch to) a holding company structure. Holding companies can directly manage R&D in fields with high initial risks, and they can diversify these risks. The larger the number of foreign investors, the greater the R&D investment, indicating that foreigners directly or indirectly impose pressure on a manager to make R&D investments that bring long-term benefits.

PHRP : Osong Public Health and Research Perspectives