Prenatal exposure to phthalate and decreased body mass index of children: a systematic review and meta-analysis

Phthalates are well-known endocrine-disrupting chemicals. Many detrimental health effects of phthalates were investigated, but studies on the association of phthalates with obesity in children showed inconsistent results. Thus, this systematic review and meta-analysis were performed to clarify whether prenatal and postnatal exposures to phthalates are associated with physical growth disturbances in children. We performed the systematic review and meta-analysis following the PRISMA 2020 statement guidelines, and found 39 studies that met our inclusion criteria, including 22 longitudinal and 17 cross-sectional studies. We observed a significant negative association between the prenatal exposure to DEHP and the body mass index (BMI) z-score of the offspring (β = - 0.05; 95% CI: - 0.10, - 0.001) in the meta-analysis, while no significant association between the prenatal exposure to DEHP and the body fat percentage of the offspring was observed (β = 0.01; 95% CI: - 0.41, 0.44). In the systematic review, studies on the association between phthalates exposure in childhood and obesity were inconsistent. Prenatal exposure to phthalates was found to be associated with decreased BMI z-score in children, but not associated with body fat percentage. Our findings suggest that phthalates disturb the normal muscle growth of children, rather than induce obesity, as previous studies have hypothesized.

Topic modeling to mind illegal compensation for occupational injuries

Background

Accurate reports of occupational injuries are important to monitor workplace safety and health initiatives. In South Korea, media reports, experts, and workers have been constantly raising the issue of underreporting. Supposedly it is because employers have strong market “incentives” by underreporting their employees’ injuries. A critical way to underreport or cover-up is illegal compensation (in Korean called “gong-sang”). Unfortunately, “gong-sang” is not counted as official occupational injury statistics. The aim of this study was to analyze the social media data using topic modeling and to explore issues surrounding “gong-sang”.

Methods

We used web scraping technology and collected 2,210 social media data from Web search engines. Data was processed to transform unstructured textual documents into structured data using the Python and applied Latent Dirichlet allocation (LDA) in the Python library, Gensim, for topic modeling.

Results

Based on the LDA method from “gong-sang”- related documentation, 10 topics were identified. Topic 1 was the greatest concern (60.5%), with keywords implying the choice between illegal compensation (“gong-sang”) and legal insurance claims. The next concern was Topic 2 including keywords associated with claims for industrial accident insurance benefits. The rest topics (topic 3-10) showed the monetary issue, precarious employment, and vulnerable body parts to “gong-sang”.

Conclusions

We explored web-based data and identified the salient issues surrounding “gong-sang”. LDA topics may be helpful to ensure efficient occupational health and safety scheme to protect vulnerable employees from “gong-sang” practices.

Key messages

The topics formulated by LDA included queries about legal insurance claims. Legal insurance claims including private or social insurance, monetary compensation, injured body parts, and the type of jobs vulnerable to “gong-sang”.

Side differences in the bone density of the distal radius and calcaneus in Koreans aged 4-86 years

Although bone mineral density (BMD) measurements of peripheral bone have been widely used due to practical and economic factors, a consensus does not exist as to whether the dominant or nondominant side is preferable for diagnosing osteoporosis and predicting fracture risk. Thus, we evaluated BMD differences of the distal radius and calcaneus between dominant and nondominant sides in the Korean population. Data were collected from 1794 subjects (979 females and 815 males) aged 4-86 yr, who were not taking any medication that affected bone metabolism or had a history of fracture. All subjects completed a questionnaire, and anthropometric and BMD measurements were taken. BMD values at the distal radii and calcanei were measured by dual-energy X-ray absorptiometry using a Lunar instrument. Significant correlations were observed between the dominant and nondominant distal radii (r=0.92; p<0.0001) and calcanei (r=0.94; p<0.0001). A side difference for the distal radius was not observed, whereas a significant side difference for the calcaneus was detected (p<0.05). Our findings provide information for recommending a sampling site upon measuring the distal radius and calcaneus during clinical or community-based studies.