Determining the ability to differentiate results between independent sun protection factor tests using the ISO24444 method
IntroductionThe sun protection factor has nowadays become a familiar metric to understand sunscreen effectiveness. This value is displayed on the label of sunscreens and it is established by translating the results obtained from standardized testing methods to regulatory labeling criteria. The ISO24...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-02-01
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| Series: | Frontiers in Medicine |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmed.2023.1042565/full |
| _version_ | 1797902869644443648 |
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| author | Aleix Bacardit |
| author_facet | Aleix Bacardit |
| author_sort | Aleix Bacardit |
| collection | DOAJ |
| description | IntroductionThe sun protection factor has nowadays become a familiar metric to understand sunscreen effectiveness. This value is displayed on the label of sunscreens and it is established by translating the results obtained from standardized testing methods to regulatory labeling criteria. The ISO24444, a widely accepted method to measure the sun protection factor, is designed to determine the validity of a single test, but it lacks criteria to compare results and many regulators only endorse the method as a valid means to label sunscreens. This supposes a challenge for manufacturers and regulators routinely using the method to take decisions on product labeling when confronted with disparate results for the same product.MethodsAnalytical review of the statistical criteria used by the method to determine test validity.ResultsFor the same product, results from independent tests (of 10 subjects each) separated less than ×1.73 can be considered as the same from the point of view of compliance to the standard.ConclusionThis range of sun protection factor values far exceeds the ranges for labeling and categorizing sunscreens as per current regulations and thus opens the possibility that sunscreens are unknowingly mislabeled. These findings can be summarized in a “discriminability map” to assist comparing results from different tests and to better inform the labeling of sunscreen products and thus increase confidence to prescribers and consumers. |
| first_indexed | 2024-04-10T09:24:03Z |
| format | Article |
| id | doaj.art-25d3486923194be1a30430823fd8bd5c |
| institution | Directory Open Access Journal |
| issn | 2296-858X |
| language | English |
| last_indexed | 2024-04-10T09:24:03Z |
| publishDate | 2023-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Medicine |
| spelling | doaj.art-25d3486923194be1a30430823fd8bd5c2023-02-20T06:51:20ZengFrontiers Media S.A.Frontiers in Medicine2296-858X2023-02-011010.3389/fmed.2023.10425651042565Determining the ability to differentiate results between independent sun protection factor tests using the ISO24444 methodAleix BacarditIntroductionThe sun protection factor has nowadays become a familiar metric to understand sunscreen effectiveness. This value is displayed on the label of sunscreens and it is established by translating the results obtained from standardized testing methods to regulatory labeling criteria. The ISO24444, a widely accepted method to measure the sun protection factor, is designed to determine the validity of a single test, but it lacks criteria to compare results and many regulators only endorse the method as a valid means to label sunscreens. This supposes a challenge for manufacturers and regulators routinely using the method to take decisions on product labeling when confronted with disparate results for the same product.MethodsAnalytical review of the statistical criteria used by the method to determine test validity.ResultsFor the same product, results from independent tests (of 10 subjects each) separated less than ×1.73 can be considered as the same from the point of view of compliance to the standard.ConclusionThis range of sun protection factor values far exceeds the ranges for labeling and categorizing sunscreens as per current regulations and thus opens the possibility that sunscreens are unknowingly mislabeled. These findings can be summarized in a “discriminability map” to assist comparing results from different tests and to better inform the labeling of sunscreen products and thus increase confidence to prescribers and consumers.https://www.frontiersin.org/articles/10.3389/fmed.2023.1042565/fullsun protection factorSPF variabilityISO24444SPF methodsunscreen labeling |
| spellingShingle | Aleix Bacardit Determining the ability to differentiate results between independent sun protection factor tests using the ISO24444 method Frontiers in Medicine sun protection factor SPF variability ISO24444 SPF method sunscreen labeling |
| title | Determining the ability to differentiate results between independent sun protection factor tests using the ISO24444 method |
| title_full | Determining the ability to differentiate results between independent sun protection factor tests using the ISO24444 method |
| title_fullStr | Determining the ability to differentiate results between independent sun protection factor tests using the ISO24444 method |
| title_full_unstemmed | Determining the ability to differentiate results between independent sun protection factor tests using the ISO24444 method |
| title_short | Determining the ability to differentiate results between independent sun protection factor tests using the ISO24444 method |
| title_sort | determining the ability to differentiate results between independent sun protection factor tests using the iso24444 method |
| topic | sun protection factor SPF variability ISO24444 SPF method sunscreen labeling |
| url | https://www.frontiersin.org/articles/10.3389/fmed.2023.1042565/full |
| work_keys_str_mv | AT aleixbacardit determiningtheabilitytodifferentiateresultsbetweenindependentsunprotectionfactortestsusingtheiso24444method |