Table 1: Sociodemographic information for the cohort of patients with a first lumbar disc herniation surgery in 2007-2009 when aged 25-60 years (n = 5842); among all and stratified for those with less or more than 180 sick-leave days in the first and second year after surgery date, respectively.

		All		First year after surgery date				Second year after surgery date
				≤ 180 sick-leave days		> 180 sick-leave days		≤ 180 sick-leave days		> 180 sick-leave days
		N	%	N	%	N	%	N	%	N	%
Age at surgery	< 45	2928	50	2195	52	733	44	2587	52	341	42
	45-55	1893	32	1300	31	593	36	1585	32	308	38
	> 55	1021	17	693	17	328	20	851	17	170	21
Sex	Women	2648	45	1746	42	902	55	2192	44	456	56
	Men	3194	55	2442	58	752	45	2831	56	363	44
Country of birth	Sweden	4967	85	3630	87	1337	81	4309	86	658	80
	Other	875	15	558	13	317	19	714	14	161	20
Level of education	Primary	949	16	600	14	349	21	773	15	176	21
	Secondary	3122	53	2209	53	913	55	2691	54	431	53
	University	1771	30	1379	33	392	24	1559	31	212	26
Sick-leave days one year prior to surgery	<= 90 days	3707	63	3139	75	568	34	3436	68	271	33
	> 90 days	2135	37	1049	25	1086	66	1587	32	548	67
Rehospitalisation first year after surgery	No	4486	77	3389	81	1097	66	3983	79	503	61
	Yes	1356	23	799	19	557	34	1040	21	316	39
		Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Number of sick-leave days	1^st year after surgery	140	123	67	46	310	64	112	103	302	104
	2^nd year after surgery	59	112	19	57	152	148	15	36	308	62
Total		5842		4188		1654		5023		819