Subgroup analyses on return to work in sick-listed employees with low back pain in a randomised trial comparing brief and multidisciplinary intervention

Table 3 Effect of multidisciplinary team-intervention compared with brief intervention in subgroups from the original study group

	All participants			Claimants excluded
	HRR (95% CI)	P of interaction	n	HRR (95% CI)	P of interaction	n
Socio-demographic models**
No moderator*	0.88 (0.68-1.13)			0.93 (0.70-1.23)
Married	0.79 (0.59-1.05)	0.28	250	0.84 (0.61-1.17)	0.40	193
Single	0.95 (0.55-1.64)		83	1.02 (0.56-1.87)		64
Work-related models**
No moderator*	0.85 (0.66-1.11)			0.95 (0.70-1.28)
Job satisfaction, high	0.52 (0.35-0.76)	0.002	142	0.44 (0.27-0.71)	0.001	106
Job satisfaction, low	1.25 (0.88-1.78)		175	1.49 (1.00-2.23)		137
Influence on work planning	0.76 (0.57-1.03)	0.06	243	0.83 (0.59-1.16)	0.036	187
No influence on work planning	1.23 (0.67-2.25)		74	1.33 (0.68-2.62)		56
Interested in returning to current job	0.76 (0.57-1.01)	0.10	275	0.82 (0.59-1.13)	0.052	206
Not interested in returning to current job	1.45 (0.65-3.25)		42	1.63 (0.68-3.89)		37
Health and work-related models***
No moderator*	0.90 (0.69-1.17)			1.03 (0.76-1.39)
At risk of losing job because of current sick leave	1.15 (0.73-1.83)	0.17	117	1.60 (0.94-2.75)	0.031	88
Not at risk of losing job	0.77 (0.56-1.08)		190	0.78 (0.54-1.15)		146
Worried about losing job	1.02 (0.70-1.47)	0.28	165	1.25 (0.81-1.90)	0.19	126
Not worried about losing job	0.76 (0.51-1.11)		142	0.79 (0.51-1.25)		108
Permanently impaired work ability	0.97 (0.69-1.37)	0.47	200	1.13 (0.76-1.69)	0.38	148
Not permanently injured	0.76 (0.48-1.20)		107	0.89 (0.54-1.47)		86

*HRR was calculated in the multivariable model without the interaction term
**Adjusted for gender, age and physical and mental component scores (SF36).
***Adjusted for gender and age.
HRR (HR_{multidisciplinary group}/HR_{brief intervention}) was calculated for each level of the independent variable.

ISSN: 1471-2474