The Fairest Test: How to Compare Two Treatments in Real Children
Experimental Design domain · Lesson 13 of 20 · Biomedical Innovations (BI)
Today's goal: Explain how randomization, blinding, and intention-to-treat make a two-treatment comparison fair, and identify each, plus equipoise, in a study description.
What a finished product looks like
This is a model of the work you should turn in. Use it to check your own: match the structure and the level of detail, do not copy it. Your wording should be your own.
1. Randomization: A web-based algorithm assigns each eligible infant to Surgery A or B by chance, 1:1, so neither family nor surgeon picks.
2. Blinding: Blind the outcome assessors who score the children later; the surgeon cannot be blinded because they always know which operation they performed.
3. Intention-to-treat: A child assigned to A but later switched to B is still analyzed in the A group, which protects the balance randomization created.
4. Equipoise: This trial is only ethical if the expert community genuinely does not yet know whether A or B is better.
How this was built, step by step
The finished product above did not appear all at once. Here is the path from the question to the turned-in work, so you can follow the same steps.
- 1Start from today's question: When you cannot control a child's biology, what makes a comparison of two treatments actually fair?
- 2Work the Model and the Explore questions to reason it out before writing anything.
- 3Pull the specific evidence the product needs from the reading and any database you used.
- 4Write it up in the required format: A colleague proposes: to find the better surgery, let each family pick Surgery A or B, then compare the groups after five years. As PI, redesign this into a fair trial. (1) Replace the family-picks step with one sentence describing randomization. (2) Add one sentence describing who you would blind and why the surgeon cannot be blinded. (3) State the intention-to-treat rule for a child assigned A whose family later switched to B. (4) Name the one condition (equipoise) that must be true before it is even ethical to randomize.
- 5Check it against the rubric, then submit.
| Criterion | Proficient | Developing | Beginning |
|---|---|---|---|
| Complete | Every required part of the artifact is present and filled in. | Most parts are present, but one is missing or left blank. | Several parts are missing. |
| Accurate | The science and data are correct and match the evidence. | Mostly correct, with a small factual slip. | Key science or data is wrong. |
| Scientific reasoning (CER) | States a claim, backs it with specific evidence, and explains the reasoning. | Has a claim and evidence, but the reasoning is thin or missing. | Gives an answer with no evidence or reasoning. |
| Professional communication | Clear, organized, and labeled the way a clinician or scientist would write it. | Readable but disorganized or missing labels. | Hard to follow. |
| Submitted | Turned in the right way (Schoology for routine work) and confirmed. | Turned in, but in the wrong place or unconfirmed. | Not turned in. |
- CompleteProficient: Nothing is left blank: the model fills every part of "A colleague proposes: to find the better cleft palate surgery, let each family pick Surgery A or B, then compare the groups after five years. As PI, redesign this into a fair trial. (1) Replace the family-picks step with one sentence describing randomization. (2) Add one sentence describing who you would blind and why the surgeon cannot be blinded. (3) State the intention-to-treat rule for a child assigned A whose family later switched to B. (4) Name the one condition (equipoise) that must be true before it is even ethical to randomize.".
- AccurateProficient: Every number and claim matches the case evidence.
- Scientific reasoning (CER)Proficient: It names a claim, cites the specific evidence, and explains the reasoning, not just the answer.
- Professional communicationProficient: It is organized and labeled like a real chart note.
- SubmittedProficient: It would be turned in on Schoology and confirmed.
WebXam problem for today's skill
One exam-style question that uses exactly what you practiced today. Try it before you reveal the answer, then read why each choice is right or wrong.
Tap an answer to see the full explanation. Nothing is recorded or graded.