Table 1

Baseline characteristics of the study population

Brief interventionNMultidisciplinary interventionN
n (%) or mean (SD)n (%) or mean (SD)
Sociodemographic variables
 Women (%)36 (43.4)8340 (52.0)77
 Age, mean (years) (SD)40.1 (11.2)8339.5 (10.0)77
 Married or cohabiting partner (%)62 (76.5)8162 (80.5)77
 Children (%)56 (68.3)8255 (71.4)77
 Completed vocational education (%)56 (68.3)8249 (63.6)77
Medication
 Weekly use of non-prescription medication70 (85.4)8264 (86.5)74
 Weekly use of strong analgesic medication11 (14.9)7422 (31.0)71
Low-back pain (the LBP Rating Scale)
 Level of low back pain at baseline, mean (SD)*5.3 (2.2)815.8 (2.4)77
 Average level of low back pain, mean (SD)*6.2 (2.0)816.4 (2.3)77
The level of physical pain within the last 4 weeks
 None (%)0 (0.0)800 (0.0)72
 Very light (%)2 (2.5)0 (0.0)
 Light (%)5 (6.3)7 (9.7)
 Medium (%)28 (35.0)21 (29.2)
 Severe (%)34 (42.5)29 (40.3)
 Very severe (%)11 (13.8)15 (20.8)
Previous sick leave due to LBP
 Never (%)21 (25.9)8123 (29.9)77
 1–2 times (%)12 (14.8)17 (22.1)
 3–4 times (%)15 (18.5)11 (14.3)
 >4 times (%)33 (40.7)26 (33.8)
Duration of sick leave due to LBP within the last 3 years
 Never (%)28 (34.6)8135 (45.5)77
 <1 month (%)18 (22.2)16 (20.8)
 1–3 months (%)17 (21.0)15 (19.5)
 4–6 months (%)6 (7.4)6 (7.8)
 >6 months (%)12 (14.8)5 (6.5)
General self-rated health (SF-36)
 Excellent (%)1 (1.23)811 (1.32)76
 Very good (%)9 (11.1)7 (9.2)
 Good (%)19 (23.5)12 (15.8)
 Fair (%)39 (48.2)33 (43.4)
 Poor (%)13 (16.0)23 (30.3)
Self-rated overall ability to work
 Excellent (%)3 (3.8)803 (4.0)75
 Very good (%)9 (11.3)10 (13.3)
 Good (%)14 (17.5)10 (13.3)
 Not so good (%)35 (43.8)25 (33.3)
 Bad (%)19 (23.8)27 (36.0)
Assessment of work ability in a year
 Much better (%)25 (31.3)8020 (27.8)72
 Somewhat better (%)23 (28.8)19 (26.4)
 About the same as now (%)26 (32.5)28 (38.9)
 Somewhat worse (%)4 (5.0)2 (2.8)
 Much worse (%)2 (2.5)3 (4.2)
  • *Scale from 1 to 10.

  • LBP, low back pain; SF-36, 36-Item Short Form Health Survey.