Plain English Summary
Background and study aims
People on long-term sickness absence have an increased risk of losing their jobs and being excluded from the labour market. Many of these people need help to get out of this situation, so that they can continue to enjoy a meaningful life at work.
The Danish National RTW-program includes three approaches that have been shown to have positive effect on return to work (RTW) for people on sickness absence:
1. Assessment of barriers and resources for returning to work
2. Increased coordination between worker, workplace, health care and social insurance systems
3. Early initiation of RTW-activities (counselling, education, on-the-job-training etc.)
The aims of the study are:
To improve municipal sickness benefit management
To evaluate the implementation process both from the beneficiaries, the RTW-teams and the external stakeholders point of views
The economic burden of this approach compared to normal sickness benefit management
The effects on the participants sickness absence duration, sustainability of RTW and on a range of secondary outcomes (sleep pattern, general health, workability etc.)
Who can participate?
Working-age adults on long-term sickness absence (at least four weeks).
What does the study involve?
The 22 municipalities involved in the project established RTW-teams comprising an RTW-coordinator (typically an experienced social worker who received extensive training), a psychologist and a physiotherapist/occupational therapist. The RTW teams established close links with psychiatrists and medical doctors. The RTW-coordinators then became the focal point for coordination between the relevant stakeholders, including employers, health care services, unions and unemployment funds and the RTW-team and the clinical unit. Data for the evaluation was obtained by questionnaires, focus-group interviews, individual interviews, municipal data and national register-data.
What are the possible benefits and risks of participating?
These improvements will hopefully reduce the average duration of sickness absence, provide a faster and more sustainable RTW and a positive development in health, sleep and workability for the participants. There are no known risks associated with taking part in this study.
Where is the study run from?
National Research Centre for the Working Environment, Copenhagen, Denmark
When is the study starting and how long is it expected to run for?
April 2010 to March 2012
Who is funding the study?
The Danish Prevention Fund and the Danish Ministry of Employment
Who is the main contact?
Dr Otto Mechior Poulsen
Dr Otto Melchior Poulsen
Lersø Parkallé 105
+45 (0)3916 5200
The Danish National RTW program: a stratified cluster controlled study of a coordinated and multidisciplinary return to work program in 22 municipalities aiming to reduce the duration of sickness absence and to enable earlier return to work for citizens on long-term sick leave
The overall objective of the intervention is to promote return to work (RTW) for citizens on long-term sick leave. The main hypothesis is that a coordinated and multidisciplinary RTW-program reduces the duration of sickness absence and promotes a faster and more sustainable RTW compared to standard municipal case management.
Specific hypotheses are that the intervention group:
1. Has a shorter duration of sickness absence
2. Is less likely to experience recurrent long-term sickness absence
3. Returns to work (become self-supporting) faster
4. Reports a more positive development in self-rated health, mental- and physical health, workability, pain and sleep patterns, and
5. The coordinated and multidisciplinary RTW-program is more cost-effective than standard municipal case management
The data collection is registered at the Danish Data Protection Agency (www.datatilsynet.dk, ref: 2009-54-08).
The Danish National Committee on Biomedical Research Ethics has in writing confirmed that the intervention does not need their approval. According to the Danish Law, only projects using biological material need approval from the Danish National Committee on Biomedical Research Ethics (http://www.cvk.im.dk/site.aspx?p=513).
Stratified cluster controlled study
Primary study design
Secondary study design
Cluster randomised trial
Patient information sheet
Not available in web format, please use the contact details below to request a participant information sheet
Long-term sickness absence
Current interventions as of 14/09/2011:
The municipalities were assigned to the control and intervention group using a stratified allocation procedure. The initial selection of municipalities was based on applications from 45 municipalities. All applications were assessed for quality and feasibility of implementation plans resulting in a total of 33 municipalities. Further, two municipalities were selected a prior due to the possibility of strong study designs (randomization of individuals and cluster allocation of sickness benefit offices within the sickness benefit offices).
All municipalities were grouped in distinct strata based on their size, socio-economic profile and organisation of the RTW-programme. Finally a stratified cluster selection was performed resulting in 13 municipalities in the intervention group and 9 municipalities (representing 12 offices) in the control group. All control municipalities were offered the intervention after the end of the study. After one year the control municipalities became intervention municipalities. Three of the municipalities are also part of an individual RCT-study (see www.controlled-trials.com/ISRCTN43004323).
The RTW-programme combines a RTW coordinator approach with a multidisciplinary approach. Four of the main strategies of the programme are:
1. Early and regular contact with citizens on sick leave
2. Multidisciplinary assessment of sick-listed citizens
3. Improved coordination between relevant stakeholders
4. Tailored rehabilitation including a combination of psychological and physiological counselling with work place modifications
The program is delivered by a case manager, a RTW-team consisting of rehabilitation professionals from physical therapy and psychology and a clinical unit consisting of a psychiatrist and one of the following medical specialties; occupational health, social medicine or general practice. The program is tailored specifically to meet the need of each participant. Both the control and the intervention group receive a baseline questionnaire at inclusion, a six months follow-up questionnaire and are followed-up in a national register of social transfers including sickness benefits.
The municipalities were assigned to the control and intervention group using a stratified allocation procedure. The initial selection of municipalities was based on applications from 43 municipalities. All applications were assessed for quality and feasibility of implementation plans resulting in a total of 33 municipalities. These municipalities were grouped in distinct strata based on their size, socio-economic profile and organisation of the RTW-programme. Finally a stratified cluster selection was performed resulting in 11 municipalities (representing 14 offices) in the intervention group and 8 municipalities (representing 12 offices) in the control group. All control municipalities were offered the intervention after the end of the study.
Primary outcome measure
1. Duration of sickness absence
2. Time until RTW (becoming self-supporting)
3. Time until reoccurrence of long-term sickness absence (greater than 3 weeks)
Measured from inclusion into the study until end of follow-up
Secondary outcome measures
1. Changes in self-rated health, mental and physical health and mental disorders (SF-12, SCL8-AD) six and twelve months after inclusion in the study
2. Changes in workability (single item), pain ('pain intensity', single 10 point Visual Analogue Scale (VAS) scale and 'pain beliefs' - 3 items modified from Tampera Scale of kinesiophobia), and sleep patterns (Karolinska Sleep Questionnaire) six and twelve months after inclusion in the study
3. Municipal sickness benefit expenses, the level of production (earnings) and municipal and central government transfer payment expenses
(Please note, twelve month measure in points 1 and 2 added 14/11/2011. Previously only six)
Overall trial start date
Overall trial end date
Reason abandoned (if study stopped)
Participant inclusion criteria
Citizens on long-term sickness absence (greater than 4 weeks) registered as a 'category 2 case' (citizens in category 2 are according to Danish legislation guidelines assumed to be unable to return to work within a three months period, but to be able to gradually return to work). Citizens of either sex and any age can be included.
Target number of participants
Intervention: approx 12,600: Control: approx 6,900
Participant exclusion criteria
1. Citizens on sickness absence related to pregnancy
2. Citizens on sickness absence longer than four months at inclusion
Recruitment start date
Recruitment end date
Countries of recruitment
Trial participating centre
Lersø Parkallé 105
Danish Prevention Fund (Forebyggelsesfonden) (Denmark)
Funding Body Type
Funding Body Subtype
Funding Body Type
Funding Body Subtype
Results and Publications
Publication and dissemination plan
Not provided at time of registration
Intention to publish date
Participant level data
Not provided at time of registration
Basic results (scientific)
Aust B, Helverskov T, Nielsen MB, Bjorner JB, Rugulies R, Nielsen K, Sørensen OH, Grundtvig G, Andersen MF, Hansen JV, Buchardt HL, Nielsen L, Lund TL, Andersen I, Andersen MH, Clausen AS, Heinesen E, Mortensen OS, Ektor-Andersen J, Ørbæk P, Winzor G, Bültmann U, Poulsen OM, The Danish national return-to-work program--aims, content, and design of the process and effect evaluation., Scand J Work Environ Health, 2012, 38, 2, 120-133, doi: 10.5271/sjweh.3272.