Table 1

Background characteristics of the participants included in and excluded from the analyses based on missing values, aged 30–64, who held a job during the preceding year (weighted proportion)

	Subjects included in the multivariable analyses (no missing values in any of the covariates), n=3137		Subjects excluded from the multivariable analyses (missing values in one or more covariates), n=618–950
	N	%	N	%
Individual factors
Age (years)
30–39	1056	34	306	32
40–49	1115	35	335	35
50–64	966	31	309	33
Female gender	1512	48	473	50
Low education (maximum 9 years)	607	19	250	26
Severely overweight or obese (BMI≥28)	959	31	318	35
Psychological symptoms	647	21	182	24
Somatisation	280	9	90	13
Mild or severe sleep problems	1394	44	284	46
Considerably reduced functional capacity	399	13	137	15
Poor self-rated health	722	23	270	28
Somatic disease diagnosed by the physician	1472	47	351	46
Musculoskeletal disease diagnosed by the physician	961	31	231	30
Work-related factors
Physically demanding work	1259	40	441	47
Job insecurity	672	22	140	23
Psychosocial demands at work (scale 5–25), mean (SD)	16 (4)		16 (4)
Job control (scale 8–40), mean (SD)	31 (6)		31 (6)
Social support at work (scale 2–10), mean (SD)	8 (2)		8 (2)
Number of musculoskeletal pain sites
0	1031	33	245	33
1	1050	33	234	32
2	648	21	143	19
3	288	9	78	10
4	120	4	43	6
Work ability outcomes
Poor physical work ability	454	15	182	19
Poor mental work ability	405	13	151	16
Work ability likely to deteriorate	401	13	141	15
Not able to continue working in current job	235	8	97	10
Have thought about retiring early	568	18	177	19