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Longitudinal Research02:20

Longitudinal Research

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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...
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The Thyroid Gland01:23

The Thyroid Gland

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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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Cancer survival analysis focuses on quantifying and interpreting the time from a key starting point, such as diagnosis or the initiation of treatment, to a specific endpoint, such as remission or death. This analysis provides critical insights into treatment effectiveness and factors that influence patient outcomes, helping to shape clinical decisions and guide prognostic evaluations. A cornerstone of oncology research, survival analysis tackles the challenges of skewed, non-normally...
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Chronic stress has been linked to both the onset and progression of serious health conditions, including Type 2 diabetes and cancer. Type 2 diabetes, a widespread chronic illness, is closely associated with obesity and insulin resistance, both of which often worsen under stress. Studies indicate that men experiencing high levels of chronic stress face a 45% higher risk of developing diabetes compared to those with minimal stress. Stress triggers physiological responses that elevate blood...
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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
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Updated: Sep 20, 2025

Computer-Aided Three-Dimensional Visualization in the Treatment of Locally Advanced Thyroid Cancer
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Association between Thyroid Cancer and Weight Change: A Longitudinal Follow-Up Study.

Young Ju Jin1, Jeong Hun Hah2, Mi Jung Kwon3

  • 1Department of Otorhinolaryngology-Head & Neck Surgery, Wonkwang University Hospital, Wonkwang University College of Medicine, Iksan 54538, Korea.

International Journal of Environmental Research and Public Health
|June 10, 2022
PubMed
Summary

Thyroidectomy did not significantly alter body mass index (BMI) or blood pressure in Korean adults. Post-surgery measurements showed no significant differences compared to matched control groups, indicating no long-term impact on these health metrics.

Keywords:
body weight changehypertensionobesitythyroid cancerthyroidectomy

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Area of Science:

  • Endocrinology
  • Cardiovascular Health
  • Public Health

Background:

  • Thyroidectomy is a common surgical procedure.
  • Understanding its impact on metabolic and cardiovascular health is crucial for patient management.
  • Previous research has yielded conflicting results regarding post-thyroidectomy body mass index (BMI) and blood pressure.

Purpose of the Study:

  • To investigate the long-term effects of thyroidectomy on body mass index (BMI), systolic blood pressure (SBP), and diastolic blood pressure (DBP).
  • To compare these parameters in Korean adults who underwent thyroidectomy versus matched control groups.

Main Methods:

  • Utilized data from the Korean National Health Insurance Service-Health Screening Cohort (2002-2015).
  • Included 1995 (Study I) and 2162 (Study II) participants undergoing thyroidectomy, matched with 7980 (Study I) and 8648 (Study II) controls.
  • Employed paired t-tests and linear mixed models to analyze BMI, SBP, and DBP changes before and after surgery.

Main Results:

  • Diastolic blood pressure (DBP) decreased significantly after thyroidectomy in both thyroid cancer and comparison groups in Study II.
  • However, the overall interaction effect of thyroidectomy on BMI, SBP, and DBP did not reach statistical significance in either study.
  • No significant differences in BMI, SBP, or DBP were observed between the thyroidectomy and matched comparison groups.

Conclusions:

  • Thyroidectomy does not appear to have a significant long-term impact on body mass index (BMI) or blood pressure (BP) when compared to matched controls.
  • While some short-term changes in DBP were noted, these did not translate to significant group differences.
  • These findings suggest that thyroidectomy, in the context of this Korean cohort, does not adversely affect key metabolic and cardiovascular indicators.