Can item response theory reduce patient burden when measuring health status in neurological disorders? Results from Rasch analysis of the SF-36 physical functioning scale (PF-10)

C Jenkinson; R Fitzpatrick; A Garratt; V Peto; S Stewart-Brown

doi:10.1136/jnnp.71.2.220

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Paper

Can item response theory reduce patient burden when measuring health status in neurological disorders? Results from Rasch analysis of the SF-36 physical functioning scale (PF-10)

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	Abstract	Full	Pdf
Jul 2001	34	38	14
Aug 2001	56	42	16
Sep 2001	35	20	6
Oct 2001	47	35	6
Nov 2001	37	27	3
Dec 2001	25	13	4
Jan 2002	35	22	7
Feb 2002	24	14	5
Mar 2002	30	20	6
Apr 2002	20	16	9
May 2002	27	16	7
Jun 2002	19	15	5
Jul 2002	26	18	2
Aug 2002	25	27	14
Sep 2002	18	9	21
Oct 2002	11	18	6
Nov 2002	4	13	10
Dec 2002	12	11	10
Jan 2003	9	8	11
Feb 2003	2	6	3
Mar 2003	8	15	13
Apr 2003	7	17	10
May 2003	13	14	9
Jun 2003	1	10	4
Jul 2003	1	10	9
Aug 2003	0	2	4
Sep 2003	10	6	2
Oct 2003	15	6	3
Nov 2003	6	7	12
Dec 2003	3	5	8
Jan 2004	12	7	8
Feb 2004	7	11	6
Mar 2004	15	10	14
Apr 2004	3	7	12
May 2004	2	5	7
Jun 2004	3	10	8
Jul 2004	52	57	16
Aug 2004	39	43	13
Sep 2004	20	46	22
Oct 2004	23	39	18
Nov 2004	11	53	16
Dec 2004	16	20	14
Jan 2005	16	40	12
Feb 2005	16	40	17
Mar 2005	21	34	22
Apr 2005	13	35	19
May 2005	6	41	20
Jun 2005	3	30	15
Jul 2005	18	19	19
Aug 2005	18	23	22
Sep 2005	8	25	22
Oct 2005	14	14	14
Nov 2005	20	42	15
Dec 2005	16	14	16
Jan 2006	3	28	16
Feb 2006	9	27	16
Mar 2006	7	26	10
Apr 2006	10	15	15
May 2006	17	21	10
Jun 2006	11	13	6
Jul 2006	9	13	9
Aug 2006	17	18	13
Sep 2006	13	17	17
Oct 2006	12	20	27
Nov 2006	14	19	13
Dec 2006	10	20	9
Jan 2007	11	20	12
Feb 2007	19	22	14
Mar 2007	6	18	17
Apr 2007	23	7	15
May 2007	11	3	9
Jun 2007	9	3	5
Jul 2007	16	3	6
Aug 2007	19	8	8
Sep 2007	12	3	4
Oct 2007	23	11	11
Nov 2007	20	2	2
Dec 2007	12	4	4
Jan 2008	11	2	2
Feb 2008	14	7	9
Mar 2008	31	5	7
Apr 2008	44	7	21
May 2008	16	2	3
Jun 2008	18	4	3
Jul 2008	18	1	3
Aug 2008	27	1	1
Sep 2008	20	2	5
Oct 2008	10	4	5
Nov 2008	11	2	1
Dec 2008	6	2	1
Jan 2009	20	3	9
Feb 2009	10	0	4
Mar 2009	11	3	3
Apr 2009	5	4	1
May 2009	9	5	6
Jun 2009	7	6	6
Jul 2009	13	4	2
Aug 2009	8	2	11
Sep 2009	10	8	5
Oct 2009	9	6	4
Nov 2009	14	1	6
Dec 2009	13	3	8
Jan 2010	17	2	11
Feb 2010	21	5	4
Mar 2010	26	8	12
Apr 2010	24	6	9
May 2010	15	2	11
Jun 2010	23	1	11
Jul 2010	15	4	14
Aug 2010	12	5	14
Sep 2010	21	6	17
Oct 2010	33	5	11
Nov 2010	48	3	11
Dec 2010	37	3	11
Jan 2011	38	6	22
Feb 2011	56	7	8
Mar 2011	35	1	12
Apr 2011	18	9	9
May 2011	20	12	1
Jun 2011	40	0	2
Jul 2011	17	1	1
Aug 2011	26	12	3
Sep 2011	19	2	1
Oct 2011	26	16	10
Nov 2011	17	6	6
Dec 2011	18	7	6
Jan 2012	13	29	5
Feb 2012	7	34	7
Mar 2012	11	32	8
Apr 2012	11	19	13
May 2012	11	22	13
Jun 2012	13	49	7
Jul 2012	14	25	11
Aug 2012	26	39	15
Sep 2012	13	68	10
Oct 2012	20	40	45
Nov 2012	33	53	68
Dec 2012	7	23	31
Jan 2013	12	43	48
Feb 2013	10	16	27
Mar 2013	17	14	51
Apr 2013	28	9	15
May 2013	13	16	21
Jun 2013	7	11	17
Jul 2013	8	11	13
Aug 2013	12	9	7
Sep 2013	13	0	2
Oct 2013	13	7	6
Nov 2013	18	6	10
Dec 2013	4	8	6
Jan 2014	12	10	3
Feb 2014	5	4	11
Mar 2014	20	18	15
Apr 2014	13	15	11
May 2014	20	10	10
Jun 2014	15	6	10
Jul 2014	27	8	6
Aug 2014	32	11	9
Sep 2014	23	8	5
Oct 2014	18	4	4
Nov 2014	14	4	2
Dec 2014	20	2	0
Jan 2015	23	2	3
Feb 2015	11	2	4
Mar 2015	16	8	7
Apr 2015	12	4	3
May 2015	6	8	1
Jun 2015	15	1	1
Jul 2015	6	10	4
Aug 2015	4	1	5
Sep 2015	16	2	4
Oct 2015	4	2	1
Nov 2015	7	1	2
Dec 2015	16	6	3
Jan 2016	9	3	3
Feb 2016	7	5	1
Mar 2016	8	2	1
Apr 2016	6	6	5
May 2016	8	7	6
Jun 2016	12	5	3
Jul 2016	5	5	5
Aug 2016	9	4	2
Sep 2016	9	5	8
Oct 2016	8	1	2
Nov 2016	18	5	3
Dec 2016	13	3	1
Jan 2017	14	2	3
Feb 2017	5	1	1
Mar 2017	6	6	3
Apr 2017	1	16	0
May 2017	2	11	4
Jun 2017	3	4	7
Jul 2017	10	8	2
Aug 2017	10	6	2
Sep 2017	11	9	0
Oct 2017	16	12	3
Nov 2017	18	16	2
Dec 2017	11	5	2
Jan 2018	21	17	6
Feb 2018	14	8	2
Mar 2018	24	18	13
Apr 2018	25	23	5
May 2018	23	23	3
Jun 2018	20	14	3
Jul 2018	14	14	3
Aug 2018	13	11	7
Sep 2018	16	14	2
Oct 2018	22	18	9
Nov 2018	14	14	2
Dec 2018	25	21	5
Jan 2019	13	11	1
Feb 2019	16	13	4
Mar 2019	19	19	6
Apr 2019	9	10	4
May 2019	10	10	3
Jun 2019	11	11	10
Jul 2019	11	9	20
Aug 2019	22	16	4
Sep 2019	4	2	5
Oct 2019	10	10	2
Nov 2019	22	12	7
Dec 2019	9	9	4
Jan 2020	12	12	7
Feb 2020	23	13	3
Mar 2020	5	5	2
Apr 2020	19	17	4
May 2020	16	16	5
Jun 2020	16	13	5
Jul 2020	33	25	8
Aug 2020	14	10	8
Sep 2020	25	13	7
Oct 2020	14	12	5
Nov 2020	15	15	7
Dec 2020	12	12	3
Jan 2021	9	7	3
Feb 2021	12	8	6
Mar 2021	15	11	4
Apr 2021	7	3	2
May 2021	5	3	5
Jun 2021	6	6	3
Jul 2021	8	8	5
Aug 2021	5	5	3
Sep 2021	9	9	9
Oct 2021	16	12	18
Nov 2021	17	15	18
Dec 2021	23	22	4
Jan 2022	20	13	4
Feb 2022	18	16	10
Mar 2022	21	21	8
Apr 2022	36	32	12
May 2022	44	44	19
Jun 2022	40	34	9
Jul 2022	28	22	6
Aug 2022	52	43	11
Sep 2022	41	37	9
Oct 2022	27	24	4
Nov 2022	39	30	11
Dec 2022	25	23	3
Jan 2023	49	41	11
Feb 2023	58	56	4
Mar 2023	26	20	4
Apr 2023	28	24	10
May 2023	49	42	11
Jun 2023	30	24	4
Jul 2023	46	43	13
Aug 2023	22	22	6
Sep 2023	41	33	12
Oct 2023	36	35	3
Nov 2023	36	38	10
Dec 2023	77	6	7
Jan 2024	33	1	2
Feb 2024	28	0	0
Mar 2024	181	1	0
Total	4984	3900	2343

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