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Blinding01:11

Blinding

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.
Dosage Regimens: Designs and Approaches01:28

Dosage Regimens: Designs and Approaches

Designing a dosage regimen, which refers to the manner of drug administration, is a complex process involving the selection of drug dose, route, and frequency. This process is underpinned by pharmacokinetic parameters derived from tests and population averages. These parameters are then tailored to patient-specific variables such as diagnosis, demographics, and allergy status. Once therapy commences, therapeutic response monitoring is critical and achieved through clinical and physical...
Preventive Healthcare Services01:30

Preventive Healthcare Services

Preventive healthcare services keep people healthy via frequent check-ups, screening, and counseling. They primarily aid in disease prevention rather than treating an acute or chronic illness. Preventive treatment also keeps individuals productive and energetic, allowing them to work well into their retirement years. Examples of preventive care services include:
Randomized Experiments01:13

Randomized Experiments

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...
Bioequivalence Experimental Study Designs: Completely Randomized and Randomized Block Designs01:20

Bioequivalence Experimental Study Designs: Completely Randomized and Randomized Block Designs

Bioequivalence experimental study designs are crucial methodologies used in evaluating and comparing the bioavailability of different drug products. These designs are categorized into various types: completely randomized, randomized block, repeated measures, cross and carry-over, and Latin square designs.Completely randomized designs involve randomly allocating treatments to all subjects participating in the experiment. This allocation is achieved by assigning unique random numbers to subjects...
Blind Procedures02:07

Blind Procedures

Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...

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Related Experiment Video

Updated: Jun 28, 2026

E-Patient Counseling Trial (E-PACO): Computer Based Education versus Nurse Counseling for Patients to Prepare for Colonoscopy
06:28

E-Patient Counseling Trial (E-PACO): Computer Based Education versus Nurse Counseling for Patients to Prepare for Colonoscopy

Published on: August 1, 2019

Cost and utilization avoidance with mail prompts: a randomized controlled trial.

Gregory D Berg1, Steven Silverstein, Eileen Thomas

  • 1McKesson Corporation, Broomfield, CO 80021, USA. greg.berg@mckesson.com

The American Journal of Managed Care
|November 13, 2008
PubMed
Summary
This summary is machine-generated.

Health plan mailings encouraging influenza vaccination or nurse advice calls reduced medical service use and generated significant return on investment. Direct mail campaigns can effectively lower healthcare costs.

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Area of Science:

  • Health Services Research
  • Health Economics
  • Public Health Interventions

Background:

  • Health plans utilize direct mailings to influence member health behaviors.
  • Understanding the return on investment (ROI) of such interventions is crucial for cost-effective healthcare management.

Purpose of the Study:

  • To evaluate the impact of direct mailings on medical service utilization.
  • To determine the ROI of health plan mailings promoting influenza vaccinations versus nurse advice services.

Main Methods:

  • A randomized controlled trial involving 134,791 members aged 65+ across 5 states.
  • Comparison of administrative claims data for inpatient bed days, emergency department visits, and outpatient services between intervention and control groups.

Main Results:

  • The influenza mailing group showed a 2.87% reduction in inpatient bed days (P=.033) and a 7.25% decrease in ED visits (P=.101).
  • The nurse advice mailing group demonstrated a 7.65% reduction in inpatient bed days (P<.001) and a 6.75% decrease in ED visits (P=.125).
  • Estimated ROI was $2.51 per dollar for influenza mailings and $24.24 for nurse advice mailings.

Conclusions:

  • Health plan members respond to direct mail communications.
  • Targeted mailings can modify medical service utilization patterns.
  • Direct mail interventions offer a cost-effective strategy for health plans to generate savings.