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BackJoy(バックジョイ) 骨盤サポートシート メディコアリリーフ...
More product info From BackJoy(バックジョイ)

Amazon Reviews for  BackJoy(バックジョイ) 骨盤サポートシート メディコアリリーフ レギュラーサイズ ブラック 【正規品】 BJSCT001
Rating:
183 Ratings
65 Reviews
("Ratings" vs. "Reviews")
0% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
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Report Info:
Last Updated: Nov 4, 2021
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Note: While Amazon.co.jp claims 183 Ratings, we counted 65 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

Fail Overall Grade
WARN Brand Repeats
WARN Suspicious Reviewers
WARN Word Count Comparison
PASS Rating Trend
PASS Unverified Purchases
PASS Overlapping Review History
PASS Reviewer Participation
PASS Reviewer Ease
PASS Deleted Reviews
N/A Phrase Repetition
N/A Incentivized Reviews

Most Trusted Reviews

5/5
User did not leave written text for this review. [Go to full review]
Dec 27, 2020      
73% TRUST
  • Verified Purchaser
  • Overrepresented word count (0 words)
  • Critical Reviewer (avg. rating: 4.2)


Least Trusted Reviews

5/5
User did not leave written text for this review. [Go to full review]
May 6, 2019      
45% TRUST
  • Verified Purchaser
  • Overrepresented word count (0 words)
  • Take-Back Reviewer (1 deleted Review; avg. rating: 4.0)
  • Brand Repeater (3 of 77 reviews for this brand; avg rating: 3.3)
  • Overlapping Review History: reviewed 3 of 9 top products
  • Easy Grader (avg. rating: 4.3)


Analysis Details

Warn Brand Repeats

Brand Repeaters


20 of the 65 reviewers have reviewed other products for this brand. While this is more Brand Repeaters than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from Brand Repeaters

from Non-Repeaters


4.5
4.5


Read more about our Brand Repeats test.

Warn Suspicious Reviewers

Take-Back Reviewers


26 of the 65 reviewers have had at least one of their past reviews for another product deleted. While this is more Take-Back Reviewers than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from take-back reviewers

from reviewers without previously deleted reviews


4.5
4.5


Read more about our Suspicious Reviewers test.

Warn Word Count Comparison
Word counts are approximated for Hanzi and Kanji


  • 100%
  • 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 65 reviews (or 100%) are within an overrepresented word count group. This is an excessively high number of reviews in overrepresented word count groups.

from reviews with an overrepresented word count

from reviews with a properly represented word count


4.5
N/A


Read more about our Word Count Comparison test.

Pass Rating Trend

  • 5%
  • Created over 1 day

We counted 65 reviews for this product over the span of 960 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 1 day exceeding this threshold:In total, we found that 3 reviews were created on just 1 day. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from reviews created on high volume days

from reviews created on normal volume days


5.0
4.5


Read more about our Rating Trend test.

Pass Unverified Purchases

1 of the 65 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.

from unverified purchasers

from verified purchases


5.0
4.5


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.

Pass Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:

29% also reviewed:
... by プリマソーレ(primasole)

26% also reviewed:
... by プリマソーレ(primasole)

Does not include products
from the same brand


28 of the 65 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.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.5
4.4


Read more about our Overlapping Review History test.

Pass Reviewer Participation

  • 0%
  • From reviewers with an overrepresented participation
We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Reviewer Participation test.

Pass Reviewer Ease
The ease score is the average rating for all reviews that a given reviewer submits. The average ease score for reviewers of this product is 4.3, while the average ease score for reviewers in this category is 4.2. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

4.3 Product's Average Ease Score

4.2 Category's Average Ease Score


4.3
4.2


Read more about our Reviewer Ease test.


Pass Deleted Reviews
  • 0
  • Reviews have been deleted
We have not discovered any deleted reviews for this product.

There are a few limitations to keep in mind regarding the Deleted Reviews test:
  1. 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.
  2. We have no information on reviews that were never published in the first place.
  3. 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.
Read more about our Deleted Reviews test.

N/A Phrase Repetition
We have not yet completed optimization for this test for Hanzi or Kanji.

N/A Incentivized Reviews
We have not yet completed optimization for this test for Hanzi or Kanji.