I have the scoring manual for the SF-12 v1 from 1998, but I have been told there is an error in the scoring for at least 1 of the items in the manual. Does anyone have information on which item, what the error is, and what the correction is?
Gretchen,
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I don't have knowledge about the SF-12 v1.
But the solution is: conduct a pilot study and score it in manual, try to find the artefact. With this experience, you may be in a position to find the error.
Thank you, Subhash. Unfortunately, this will not work in this case. The SF-12 is a measure used to assess global health and well-being. It has been validated used in thousands of studies. Responses are given specific weights and then added together with a constant to come up with score for physical and mental health.
The SF-12 scoring is propriety to Optum and not publicly available. However, the company is no longer offering v1 of the SF-12 (they currently offer v2, which has different responses and different scoring) and no information is available about v1 on the company's website.
What I want to know if if anyone who had a license for v1 knows if there were any corrections ever published to the SF-12 v1 scoring.
I have reviewed several studies and critiques of SF-12 version 1, I didn't find anything that stated official correction to the survey or the manual. There are however other criticisms that might suggest a problem with one of the items:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1361174/
http://p16277.typo3server.info/fileadmin/download/PschologyScience/1-2008/03_Maurischat.pdf
http://bmb.oxfordjournals.org/content/early/2011/12/29/bmb.ldr049.full
http://www.sciencedirect.com/science/article/pii/S1098301513000168
Hi,
How did you get on finding out about the errors Gretchen?
I'm confused about the method by which to score the SF-12 Version 1.
The 1998 Ware manual (Article How to score SF-12 items
) p.22 differs from other instructions I've found online - https://medicine.umich.edu/sites/default/files/content/downloads/Scoring%20Instructions%20for%20the%20EPIC%2026.pdfNamely Ware instructs multiplying each indicator variable "by its respective physical regression weight and summing the 35 products" then adding the respective constant, whereas the 2nd document (which refers to a specific study) simply suggests summing all standardized values (then adding 56.57706 for PCS and 60.75781 for MCS).
I'd be grateful if anyone could clarify!
For future reference - I contacted Quality Metric and received a version of their PRO CoRE Scoring Software for version 1. They stopped recommending hand scoring 'years ago' because of the propensity of errors made during hand scoring.
Comparing my hand scoring to the software scores I can certainly concur!
Victoria,
Can you share with us the software or the contact info on how to get it?
Victoria Singh, Nabeel Hamzeh, Anjali Sivaramakrishnan
Hello! I'm in the same situation re: SF12v1 scoring. Did anyone reach a conclusion and would like to share?
Christine M Abraham Did you find a way to score SF12v1? Thank you in advance!
Is it possible that you find the item 12 with 5 instead 6 responses? It is not an error, it is a modification (options 4 and 5 converge in just one option). Be aware of positive and negative direction of the items: I have detected many errors in papers assuming that all are direct indicators of QoL (and summing all of them as the response scale is ordered)!!!!
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