Unit quiz: Skin as a measured surface: regional anatomy, instruments, and study design

Check understanding, separately from reading

5 questions · 80% to pass · no timer. This quiz checks the lessons in this unit. These authored questions assess recognition and application of the taught distinctions, not professional qualification. You may review the lessons and retry. Repeat attempts reuse the question bank; a remembered answer is not proof of transfer to a new situation.

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Question 1

A learner's forearm patch test for a new body lotion was negative, so she plans to use the same lotion on her eyelid area because the ingredients are identical. Using the regional anatomy from this unit, what is the correct reasoning?A negative forearm test says the forearm tolerated the formula; the eyelid is the thinnest skin on the body at 0.55 mm with easier allergen penetration, and periorbital use with a diagnosed corneal condition is a clinician question, not a site substitutionBecause the ingredient list is identical, tolerance at one site establishes tolerance at every site, so the forearm result can be extended to the eyelid

Question 2

A claim states that a moisturiser cut trans-epidermal water loss by 15 per cent after two weeks on the forearm, with no other detail. A learner wants to compare it with a claim of a 25 per cent hydration increase on the cheek. What is the correct appraisal?The 25 per cent hydration claim is stronger because the percentage is larger and the cheek is closer to the face than the forearmThe two numbers measure different properties on different sites with different instruments, so they cannot be ranked; each needs its own site reliability and measurement error before either is interpretable

Question 3

A brand markets a barrier serum, citing a trial in which 30 participants used the product and their barrier measurements improved significantly over eight weeks. There was no comparison group. What is the strongest reading?A significant within-group improvement over time is compatible with regression to the mean, seasonal change, changed cleansing habits and measurement drift, so it does not establish that the product caused the changeStatistical significance within the group shows the product improved barrier function, and the absence of a control group only affects how generalisable the finding is

Question 4

A 32-participant split-face study reports that the antioxidant side improved more than the placebo side, but it does not state the randomisation method, the blinding of the assessor, or the number analysed per side. What is the appropriate conclusion?Because a split-face design assigns both treatments within the same person, it is self-controlling and therefore reliable even when the reporting omits allocation and blinding detailsThe design is efficient for a topical question and the direction of the result is informative, but the appraisal is incomplete: without randomisation, assessor blinding and numbers analysed, the result remains modest support rather than settled fact

Question 5

A reviewer dismisses a trial because 12 of its 40 randomised participants did not complete the study, arguing that a per-protocol analysis of the 28 completers is the scientifically clean approach. How should that argument be assessed?Analysing only completers removes participants in a way related to tolerance and adherence, so it breaks the comparison randomisation created; intention-to-treat analysis by originally assigned group is the conservative default and the non-completion is itself reportable informationRemoving non-completers improves data quality because it excludes people who did not follow the protocol, so the per-protocol analysis is more accurate

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