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Related Concept Videos

Randomized Experiments01:13

Randomized Experiments

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The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...
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Blinding01:11

Blinding

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Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
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Related Experiment Video

Updated: Mar 13, 2026

Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants
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Randomized Intervention Trial to Decrease Bisphenol A Urine Concentrations in Women: Pilot Study.

Todd Hagobian1, Allison Smouse1, Mikaela Streeter1

  • 11 Department of Kinesiology, California Polytechnic State University , San Luis Obispo, California.

Journal of Women'S Health (2002)
|October 12, 2016
PubMed
Summary

A 3-week intervention significantly reduced urinary bisphenol A (BPA) concentrations in women. This study highlights the effectiveness of targeted lifestyle changes in lowering exposure to endocrine disruptors.

Keywords:
BPAdietendocrine disruptorsinterventionweight

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Area of Science:

  • Environmental Health
  • Endocrinology
  • Toxicology

Background:

  • Women exhibit higher concentrations of the endocrine disruptor bisphenol A (BPA).
  • A lack of effective interventions to reduce BPA exposure in women has been noted.
  • Previous research indicates a need for targeted strategies to mitigate BPA levels.

Purpose of the Study:

  • To test the hypothesis that a 3-week intervention can decrease urinary BPA concentrations in women.
  • To evaluate the impact of lifestyle modifications on BPA exposure.
  • To provide a foundation for future clinical trials investigating BPA reduction.

Main Methods:

  • 24 women were randomly assigned to either an intervention or control group.
  • The intervention involved weekly meetings focused on reducing BPA from food, cosmetics, and packaged products.
  • Participants received BPA-free products and self-monitored BPA sources; urine BPA and weight were assessed bi-weekly.

Main Results:

  • A significant interaction effect was observed for creatinine-adjusted BPA concentrations (p=0.04).
  • Intervention group showed a significant decrease in urinary BPA (-0.71 ng/mL), while the control group showed an increase (0.32 ng/mL).
  • The intervention group experienced significant weight loss (-0.28 kg), contrasting with weight gain in the control group (+1.65 kg).

Conclusions:

  • A 3-week intervention effectively decreased urinary BPA concentrations in women.
  • Further clinical trials are warranted to confirm these findings.
  • Future research should explore the impact of BPA reduction on cardiovascular disease and diabetes risk markers.