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Published in: BMC Public Health 1/2017

Open Access 01-12-2017 | Research article

Improving the effectiveness of sickness benefit case management through a public-private partnership? A difference-in-difference analysis in eighteen Danish municipalities

Authors: Malene Rode Larsen, Birgit Aust, Jan Høgelund

Published in: BMC Public Health | Issue 1/2017

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Abstract

Background

The aim of this study was to investigate whether a multidimensional public-private partnership intervention, focussing on improving the quality and efficiency of sickness benefit case management, reduced the sickness benefit duration and the duration until self-support.

Methods

We used a difference-in-difference (DID) design with six intervention municipalities and 12 matched control municipalities in Denmark. The study sample comprised 282,103 sickness benefit spells exceeding four weeks. The intervention group with 110,291 spells received the intervention, and the control group with 171,812 spells received ordinary sickness benefit case management. Using register data, we fitted Cox proportional hazard ratio models, estimating hazard ratios (HR) and confidence intervals (CI).

Results

We found no joint effect of the intervention on the sickness benefit duration (HR 1.02, CI 0.97–1.07) or the duration until self-support (HR 0.99, CI 0.96–1.02). The effect varied among the six municipalities, with sickness benefit HRs ranging from 0.96 (CI 0.93–1.00) to 1.13 (CI 1.08–1.18) and self-support HRs ranging from 0.91 (CI 0.82–1.00) to 1.11 (CI 1.06–1.17).

Conclusions

Compared to receiving ordinary sickness benefit management the intervention had on average no effect on the sickness benefit duration or duration until self-support. However, the effect varied considerably among the six municipalities possibly due to differences in the implementation or the complexity of the intervention.
Appendix
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Footnotes
1
In some cases a person had two sickness benefit spells interrupted by a few weeks without benefits, e.g. because of holidays. To avoid such misclassifications, we coded two spells separated by a period of under five weeks without sickness benefit as one consecutive spell
 
2
In both the intervention and control municipalities almost 12% of the spells had a duration exceeding 52 weeks
 
3
As the clustered (robust) SEs may also be biased with few clusters [35:313], we report the conventional (unclustered) SEs for the intervention effects of the separate analyses of each of the six intervention municipalities. As a robustness analysis we performed an analysis with only one control municipality for each of the six intervention municipalities, i.e. a cluster-specific fixed-effects model [43]
 
4
2nd year before the initiation of the intervention is reference year in both of the figures and the robustness test.
 
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Metadata
Title
Improving the effectiveness of sickness benefit case management through a public-private partnership? A difference-in-difference analysis in eighteen Danish municipalities
Authors
Malene Rode Larsen
Birgit Aust
Jan Høgelund
Publication date
01-12-2017
Publisher
BioMed Central
Published in
BMC Public Health / Issue 1/2017
Electronic ISSN: 1471-2458
DOI
https://doi.org/10.1186/s12889-017-4236-5

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