{smcl}
{* *! version 0.12 2021-04-21}{...}
{viewerjumpto "Syntax" "sf12##syntax"}{...}
{viewerjumpto "Description" "sf12##description"}{...}
{viewerjumpto "Examples" "sf12##examples"}{...}
{viewerjumpto "Acknowledgements" "sf12##acknowledgements"}{...}
{viewerjumpto "References" "sf12##references"}{...}
{viewerjumpto "Author" "sf12##author"}{...}
{title:Title}
{phang}
{bf:sf12} {hline 2} Validate sf12 input and calculate sf12 version 2 t scores
{marker syntax}{...}
{title:Syntax}
{p 8 17 2}
{cmdab:sf12} {it:varlist(min=12 max=12)}[{cmd:,} {it:options}]
{synoptset 20 tabbed}{...}
{synopthdr}
{synoptline}
{syntab:Main}
{synopt:{opt w:eights}} Choose between the (default) US general population 1990
{it:us1990} where the weights etc are the ones from {browse "https://labs.dgsom.ucla.edu/hays/pages/programs_utilities":Ronald D Hays webpage}
or {it:dk2018} for the danish 2018 weights, see
{browse "https://www.defactum.dk/siteassets/defactum/3-projektsite/hvordan-har-du-det/hhdd-2017/konference-marts-2018/bind-1/bilag.pdf":Hvordan har du det? 2017 – Sundhedsprofil for region og kommuner (Bind 1).}
{p_end}
{synopt:{opt noq:uietly}} Show output from code in log{p_end}
{synopt:{opt c:lear}} Delete existing sf12 variables before generating new variables{p_end}
{synopt:{opt p:refix}} Add string argument as prefix to the generated new variables{p_end}
{synoptline}
{p2colreset}{...}
{p 4 6 2}
{marker description}{...}
{title:Description}
{pstd}
{cmd:sf12} takes 12 variables in correct order (i1 i2a i2b i3a i3b i4a i4b i5
i6a i6b i6c i7), validate the variables with respect to sf12 requirements.
Only rows that are correct are used for calculating the sf12 t scores.{break}
The default underlying z-scores are based on US general population 1990 means
and sd's (They are not age/gender based).
{p_end}
{pstd}{red:It is important} for users to understand that the scaling should be
the exact same as indicated by the sf12 version 2 questionaire.{break}
Also it is important to know that answers for i1, i5, i6a, and i6b will be
reversed when using the command.
{p_end}
{pstd}The code is based on {browse "https://labs.dgsom.ucla.edu/hays/pages/programs_utilities":Ronald D Hays webpage},
especially the {browse "https://labs.dgsom.ucla.edu/hays/files/view/docs/programs-utilities/sf12v2-1.sas.rtf":SAS code version}.
{p_end}
{marker examples}{...}
{title:Examples}
Input example data by copying the following:
{cmd:. clear}
{cmd:. input} id i1 i2a i2b i3a i3b i4a i4b i5 i6a i6b i6c i7
1 1 1 1 1 1 1 1 1 1 1 1 1
2 1 1 3 3 3 3 3 3 3 3 3 3
3 1 1 . 3 3 3 3 3 3 3 3 3
4 5 5 1 1 1 . . . . . . .
end
Check that input data are loaded:
{cmd:. list}, noobs
+-------------------------------------------------------------------------+
| id i1 i2a i2b i3a i3b i4a i4b i5 i6a i6b i6c i7 |
|-------------------------------------------------------------------------|
| 1 1 1 1 1 1 1 1 1 1 1 1 1 |
| 2 2 1 1 3 3 3 3 3 3 3 3 3 |
| 3 3 1 1 . 3 3 3 3 3 3 3 3 |
| 4 4 5 5 1 1 1 . . . . . . |
+-------------------------------------------------------------------------+
Run {cmd:sf12} on example data:
{cmd:. sf12} i1 i2a i2b i3a i3b i4a i4b i5 i6a i6b i6c i7
List the generated variables:
{cmd:. list} id pf rp bp gh vt sf re mh agg_phys agg_ment, noobs
+------------------------------------------------------------------------------------------+
| id pf rp bp gh vt sf re mh agg_phys agg_ment |
|------------------------------------------------------------------------------------------|
| 1 22.11 20.32 57.44 61.99 67.88 16.18 11.35 40.16 43.47 32.72 |
| 2 39.29 38.75 37.06 61.99 47.75 36.37 33.71 40.16 45.73 38.88 |
| 3 . 38.75 37.06 61.99 47.75 36.37 33.71 40.16 . . |
| 4 . 20.32 . 18.87 . . . . . . |
+------------------------------------------------------------------------------------------+
To eg see generated variables and their labels:
{cmd:. ds i*, not detail}
storage display value
variable name type format label variable label
---------------------------------------------------------------------------------------------
pf double %10.0g * NEMC (US 1990) physical functioning t-score
rp double %10.0g * NEMC (US 1990) role limitation physical t-score
bp double %10.0g * NEMC (US 1990) pain t-score
gh double %10.0g * NEMC (US 1990) general health t-score
vt double %10.0g * NEMC (US 1990) vitality t-score
sf double %10.0g * NEMC (US 1990) social functioning t-score
re double %10.0g * NEMC (US 1990) role limitation emotional t-score
mh double %10.0g * NEMC (US 1990) mental health t-score
agg_phys double %10.0g * NEMC (US 1990) physical health t-score - sf12
agg_ment double %10.0g * NEMC (US 1990) mental health t-score - sf12
There are documenting comments in {cmd:notes}:
{cmd:. notes pf bp}
pf:
1. Based on i2a (i2a) and i2b (i2b)
bp:
1. Based on reversed i5 (i5)
To get the DEFACTUM weights
{cmd:. sf12 i1 i2a i2b i3a i3b i4a i4b i5 i6a i6b i6c i7, weights(dk2018) clear}
{cmd:. format pf-agg_ment %6.2f}
{cmd:. list id pf-agg_ment, noobs}
+------------------------------------------------------------------------------------------+
| id pf rp bp gh vt sf re mh agg_phys agg_ment |
|------------------------------------------------------------------------------------------|
| 1 20.39 20.79 57.78 62.94 67.79 14.49 17.98 40.28 34.99 36.10 |
| 2 38.23 39.22 39.57 62.94 48.54 35.34 37.80 40.28 42.13 41.43 |
| 3 . 39.22 39.57 62.94 48.54 35.34 37.80 40.28 . . |
| 4 . 20.79 . 22.42 . . . . . . |
+------------------------------------------------------------------------------------------+
{marker acknowledgements}{...}
{title:Acknowledgements}
{pstd}A special thanks to Finn Breinholt Larsen at DEFACTUM for helping with
the DEFACTUM scores and weights.
{p_end}
{marker references}{...}
{title:References}
{phang}
Hays RD, Sherbourne CD, Spritzer KL, & Dixon W J. (1996){break}
A Microcomputer Program (sf36.exe) that Generates SAS Code for Scoring the SF-36 Health Survey.{break}
Proceedings of the 22nd Annual SAS Users Group International Conference, 1128-1132.
{p_end}
{phang}
Ron D. Hays, Leo S. Morales (2001){break}
{browse "http://www.rand.org/content/dam/rand/pubs/reprints/2005/RAND_RP971.pdf":The RAND-36 Measure of Health-Related Quality of Life}{break}
Annals of Medicine, v. 33, 2001, pp. 350-357
{p_end}
{phang}
Larsen FB, Pedersen MH, Lasgaard M, Sørensen JB, Christiansen J, Lundberg A, Pedersen SE, Friis K.
{browse "https://www.defactum.dk/siteassets/defactum/3-projektsite/hvordan-har-du-det/hhdd-2017/konference-marts-2018/bind-1/bilag.pdf":Hvordan har du det? 2017 – Sundhedsprofil for region og kommuner (Bind 1).}
Aarhus: DEFACTUM, Region Midtjylland;
2018.
{p_end}
{phang}
Sepideh S Farivar, William E Cunningham and Ron D Hays (2007)
{browse "http://www.rand.org/content/dam/rand/pubs/reprints/2008/RAND_RP1309.pdf":Correlated physical and mental health summary scores for the SF-36 and SF-12 Health Survey, V.1}
Health and Quality of Life Outcomes 2007, 5:54
{p_end}
{marker author}{...}
{title:Author}
{p}
Niels Henrik Bruun,{break}Research data and statistics{break}Aalborg University Hospital.
Email {browse "mailto:niels.henrik.bruun@gmail.com":niels.henrik.bruun@gmail.com}