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Related Concept Videos

Regression Toward the Mean01:52

Regression Toward the Mean

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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...
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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
Surface Area
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Another way in which a group presence can affect performance is social loafing—the exertion of less effort by a person working together with a group. Social loafing occurs when our individual performance cannot be evaluated separately from the group. Thus, group performance declines on easy tasks (Karau & Williams, 1993). Essentially individual group members loaf and let other group members pick up the slack. Because each individual’s efforts cannot be evaluated,...
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Many human characteristics, like height, are shaped by both nature—in other words, by our genes—and by nurture, or our environment. For example, chronic stress during childhood inhibits the production of growth hormones and consequently reduces bone growth and height. Scientists estimate that 70-90% of variation in height is due to genetic differences among individuals, and 10-30% of variation in height is due to differences in the environments that individuals experience,...
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In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...
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Brick sizing plays a crucial role in construction, influencing both the aesthetics and structural integrity of buildings. Bricks are defined by three dimensions: width, thickness, and length. They are commonly designed to fit modular measurements, typically in multiples of 4 inches or 8 inches in width, to facilitate uniform construction and compatibility with other building materials.
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Related Experiment Video

Updated: Mar 29, 2026

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
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Bigger Isn't Always Bigger.

Amy Lynn Sorrel

    Texas Medicine
    |December 3, 2015
    PubMed
    Summary

    The proposed Aetna-Humana merger raises concerns among Texas physicians about reduced contract power and narrower provider networks. This potential consolidation in the health insurance market could impact patient access and physician reimbursement.

    Area of Science:

    • Healthcare Economics
    • Health Insurance Market Dynamics
    • Physician Advocacy

    Background:

    • Aetna's proposed acquisition of Humana Inc. for $37 billion represents a significant consolidation within the health insurance industry.
    • Existing concerns among healthcare providers regarding health plan market power and network adequacy are heightened by this potential merger.

    Purpose of the Study:

    • To analyze the potential impact of the Aetna-Humana merger on physician contract negotiating power in Texas.
    • To assess the anticipated effects of the merger on the breadth and accessibility of provider networks for patients.

    Main Methods:

    • Qualitative analysis of physician and Texas Medical Association (TMA) concerns.
    • Review of market concentration trends in the health insurance sector.

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    Main Results:

    • Physicians and the TMA anticipate a weakening of their bargaining leverage with consolidated health plans.
    • Concerns exist that the merger will lead to further reductions in already limited provider networks, potentially restricting patient choice.

    Conclusions:

    • The Aetna-Humana merger poses potential risks to physician contract terms and patient access to care in Texas.
    • Regulatory scrutiny is warranted to address the competitive implications of large-scale health insurance mergers on provider networks and negotiating power.