Table BACKSIZE1 - 2004/05

Estimated prevalence and rates (%) of self-reported musculoskeletal disorders mainly affecting the back caused or made worse by current or most recent job, by workplace size, for people working in the last 12 months, 2004/05, 2003/04 and 2001/02

2004/05
2003/04
2001/02

Number of people in workplace +	Illness ascribed to their current/most recent job
	Sample cases	Estimated prevalence (thousands)			Rate per 100 employed in the last 12 months
		central	95% C.I.		central	95% C.I.
		central	lower	upper	central	lower	upper
Self employed on own or with partners but no employees	50	27	20	35	0.99	0.71	1.3

1-24 employees	99	51	41	61	0.55	0.44	0.66
25+ employees	238	126	110	143	0.75	0.65	0.85
Missing	1	..	..	..	..	..	..

1-49 employees	144	75	63	87	0.58	0.49	0.68
50+ employees	193	102	87	117	0.77	0.66	0.88
Missing	1	..	..	..	..	..	..
All persons	388	205	184	226	0.70	0.63	0.78

Notes:

Definitions and data reliability
.. Not applicable
+ Relates to the number of people at their workplace, which is not necessarily the same as the number of people working for the company.
See section 2.7 and Appendix 3.2 in the 'Self-reported work-related illness in 2004/05' (SWI04/05) report for more details on prevalence estimates and rates.
The estimates in this table take account of revisions made to the Great Britain population estimates following the 2001 Census.