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The discussion of bullying highlights the problem of witnesses not intervening to help a victim. This is a common occurrence, as the following well-publicized event demonstrates. In 1964, in Queens, New York, a 19-year-old woman named Kitty Genovese was attacked by a person with a knife near the back entrance to her apartment building and again in the hallway inside her apartment building. When the attack occurred, she screamed for help numerous times and eventually died from her stab wounds.
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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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An increasing function exhibits a rise in output values as input values increase. This behavior is depicted graphically as a curve or line that slopes upward from left to right. Such a function satisfies the condition that if x1 < x2, then f(x1) < f(x2), indicating that the function values grow with increasing inputs. This concept is fundamental in understanding growth trends across various domains, such as population dynamics, financial investments, or resource consumption.The...
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A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in...
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Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
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Related Experiment Video

Updated: Feb 11, 2026

A Training Program Using an Agility Ladder for Community-Dwelling Older Adults
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Does Non-Targeted Community CPR Training Increase Bystander CPR Frequency?

Amy Uber, Richard C Sadler, Todd Chassee

    Prehospital Emergency Care
    |May 2, 2018
    PubMed
    Summary
    This summary is machine-generated.

    A community CPR training initiative in Kent County, MI, did not increase bystander CPR rates or improve patient outcomes. The non-targeted approach showed no significant impact on cardiac arrest survival or neurological function.

    Keywords:
    cardiopulmonary resuscitationgeographic information systemsout-of-hospital cardiac arrestprocess assessment

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    Area of Science:

    • Emergency Medicine
    • Public Health
    • Cardiovascular Research

    Background:

    • Out-of-hospital cardiac arrest (OHCA) survival is significantly influenced by bystander Cardiopulmonary Resuscitation (CPR).
    • Kent County, MI, faced low bystander CPR rates (37%) for OHCA events.
    • A 2014 intervention aimed to increase bystander CPR through public, point-of-contact training.

    Purpose of the Study:

    • To evaluate the effectiveness of a broad, non-targeted community CPR education intervention.
    • To assess the impact on bystander CPR frequency, CPR type, and clinical outcomes post-intervention.
    • To investigate potential geospatial variations in CPR rates and outcomes around training sites.

    Main Methods:

    • A retrospective, observational, before-and-after study design was employed.
    • Data included adult, EMS-treated OHCA cases in Kent County from 2010-2015.
    • Statistical analyses included chi-squared, Fisher's exact, t-tests, and difference-in-differences modeling with generalized estimating equations (GEE).

    Main Results:

    • The intervention included 2,253 participants but resulted in no statistically significant increase in overall bystander CPR frequency.
    • Compression-only CPR increased but was paradoxically concentrated in areas outside the training site radii.
    • No significant improvements were observed in return of spontaneous circulation (ROSC), survival to hospital discharge, or favorable neurological outcomes (CPC 1-2).

    Conclusions:

    • A broad, non-targeted community CPR education strategy had no discernible impact on bystander CPR performance or OHCA patient outcomes.
    • Future interventions in this region should consider targeted CPR education in areas with historically low bystander CPR rates.
    • Further research is needed to explore effective strategies for improving bystander CPR in diverse community settings.