Doctoring Data: How to sort out medical advice from medical nonsense
More product info
From Dr Malcolm Kendrick
Refresh the report to view the most up-to-date data available:
Report Card
Most Trusted Reviews
TRUST
- Verified Purchaser
- Take-Back Reviewer (1 deleted Review; avg. rating: 1.0)
- Overlapping Review History: reviewed 2 of 9 top products
- Easy Grader (avg. rating: 4.5)
Least Trusted Reviews
TRUST
- Verified Purchaser
- Overrepresented Participation (posted 3 Reviews)
- Easy Grader (avg. rating: 5.0)
Analysis Details
One-Hit Wonders
23 of the 158 reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, the discrepancy in ratings between the One-Hit Wonders and reviewers who have posted more than one review isn't significant enough to rule out the possibility of it being due to random chance.
Take-Back Reviewers
45 of the 158 reviewers have had at least one of their past reviews for another product deleted. This is an excessively large percentage of Take-Back Reviewers which may indicate unnatural reviews.
4.6 Product's Average Ease Score
4.4 Category's Average Ease Score
Read more about our Reviewer Ease test.
We discovered a total of 2 deleted Reviews for this product, with an average rating of 3.5. Even though deleted reviews don't affect the average rating, the fact that action was taken to delete reviews raises some red flags about the integrity of the reviews for the product as whole.
There are a few limitations to keep in mind regarding the Deleted Reviews test:
- We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
- We have no information on reviews that were never published in the first place.
- We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.
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- 17%
- Created over 8 days
We counted 158 reviews for this product over the span of 1,451 days, an average of 0.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 2 or fewer reviews on any given day.
However, we see the following 8 days exceeding this threshold:In total, we found that 27 reviews were created on just 8 days. This is an excessively high number of reviews submitted on these high volume days.
(5.0/5)
(5.0/5)
(4.6/5)
(4.8/5)
(5.0/5)
(5.0/5)
(4.7/5)
(4.3/5)
(5.0/5)
(5.0/5)
53 of the 158 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.
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- 59%
- From reviewers with an overrepresented participation
We see the following 2 participation groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 94 reviewers (or 59%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
4 of the 158 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.
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- 22%
- Have an overrepresented word count
In the graph above, we can see the distribution of review word counts for this product and the expected distribution for this category. We see the following 1 group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 35 reviews (or 22%) are within an overrepresented word count group. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
12% also reviewed:
The Great Cholesterol Con: The Truth About What... by Malcom Kendrick
7% also reviewed:
The Big Fat Surprise: Why Butter, Meat and Cheese... by Nina Teicholz
6% also reviewed:
Good Calories, Bad Calories by Gary Taubes
4% also reviewed:
Grain Brain: The Surprising Truth about Wheat,... by David Perlmutter
4% also reviewed:
Davidson's Tea Bulk by DAVIDSON'S
4% also reviewed:
Tripping over the Truth: How the Metabolic Theory... by Travis Christofferson
3% also reviewed:
Vitamin K2 and the Calcium Paradox: How a... by Kate Rheaume-Bleue
3% also reviewed:
Death by Food Pyramid: How Shoddy Science,... by Denise Minger
3% also reviewed:
"A Disgrace to the Profession" by Mark Steyn (editor)
46 of the 158 reviewers have substantial overlapping product review history. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Brand Repeaters
17 of the 158 reviewers have reviewed other products for this brand. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
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- 0%
- Admitted to receiving an incentive
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.