BMC Public Health

Table 2 Data collection procedure and numbers of observations

From: Low back pain and physical activity – A 6.5 year follow-up among young adults in their transition from school to working life

	2002–2003			2003–2004			2004–2005			2005–2006			2006–2007			2007–2008			2008–2009
	T0^a	T1	T2^a	T3	T4^a	T5^a	T6	T7^a	T8	T9	T10	T11^a	T12	T13	T14^a	T15	T16	T17^a	T18	T19	T20^a
Tobacco	419	______________________________						203	______________			198	_________		146	_________		138	_________		191
Education	420	________________________________________________________________________________________________________________________________________________
Ethnicity	417	________________________________________________________________________________________________________________________________________________
Socioeconomic	415	________________________________________________________________________________________________________________________________________________
Low back pain	418	266	290	259	278	262	238	206	212	197	181	196	166	142	145	134	141	138	113	143	191
Physical activity	420	___	298	___	285	263	___	206	______________			195	________		145	_________		138	________		192
BMI	410	_______________________________						140	______________			87	__________________________					78	________		132
Physical work demands	420	________________________________________________________________________________________________________________________________________________

^aTime point included in analysis. Most participants with electrician/hairdresser education carried out their apprenticeship between T3 and T9. Between T10 and T20 most participants had entered working life

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ISSN: 1471-2458

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