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‘Relieved Working’ study: intervention to decrease occupational quartz exposure at construction worksites


- candidate number17694
- NTR NumberNTR4586
- ISRCTNISRCTN no longer applicable
- Date ISRCTN created
- date ISRCTN requested
- Date Registered NTR7-mei-2014
- Secondary IDs 
- Public Title ‘Relieved Working’ study: intervention to decrease occupational quartz exposure at construction worksites
- Scientific Title ‘Relieved Working’ study: intervention to decrease occupational quartz exposure at construction worksites
- ACRONYMRelieved Working
- hypothesisOur hypothesis is that after the intervention the exposure assessment and behavioral factors (e.g. knowledge, skills and social influence) in the intervention group will be significantly higher than the outcomes of those in the control group at follow-up
- Healt Condition(s) or Problem(s) studiedOccupational diseases
- Inclusion criteria1. Construction workers
2. Availability: available for the study for the following 12 months
3. Permission: signed an informed consent
4. No co-intervention of other long term health programs
- Exclusion criteria1. Medical contraindication for participation
2. Not sufficiently capable of using the Dutch language
- mec approval receivedno
- multicenter trialno
- randomisedyes
- masking/blindingNone
- controlActive
- groupParallel
- Type2 or more arms, randomized
- Studytypeintervention
- planned startdate 1-jan-2012
- planned closingdate31-dec-2014
- Target number of participants120
- InterventionsThe intervention aimed to integrate technical, behavioural and organizational factors. The intervention consists of two plenary meetings for all employers within the company and individual visits at construction worksites including specific intervention materials. Additionally, a demonstration session about control measures is organized for all managers.
- Primary outcomePersonal respirable dust and quartz exposure
- Secondary outcomeBehavioural outcomes:
- beliefs
- skills
- intention
- risk perception
- TimepointsBaseline
Follow-up (1 year)
- Trial web site
- statusinclusion stopped: follow-up
- CONTACT FOR PUBLIC QUERIESMSc Karen Oude Hengel
- CONTACT for SCIENTIFIC QUERIESMSc Karen Oude Hengel
- Sponsor/Initiator Netherlands Organization for Applied Scientific Research (TNO)
- Funding
(Source(s) of Monetary or Material Support)
- PublicationsQuartz and Respirable Dust in the Dutch Construction Industry: A Baseline Exposure Assessment as Part of a Multidimensional Intervention Approach. van Deurssen E, Pronk A, Spaan S, Goede H, Tielemans E, Heederik D, Meijster T. Ann Occup Hyg. 2014 Apr 10. [Epub ahead of print]
- Brief summaryOccupational quartz exposure continues to be an important hazard in the construction industry. Until now, evidence-based interventions aimed at reducing quartz exposure are scarce. The aim of this study was to systematically develop an intervention and to describe the study to evaluate its effectiveness.

The intervention was developed according to the principles of the Intervention Mapping protocol, meaning that evidence from the literature was combined with information collected from stakeholders (e.g., construction workers, managers and researchers). The intervention aimed to integrate technical, behavioral and organizational factors. The intervention consists of two plenary meetings for all employers within the company and individual visits at construction worksites including specific intervention materials. Additionally, a demonstration session about control measures is organized for all managers. The effectiveness of the intervention will be evaluated in a cluster randomized controlled trial among eight construction companies, with measurements at baseline and follow-up. Outcome measures are personal respirable dust and quartz exposure by means of exposure assessment and behavioural and organizational determinants which will be assessed by means of questionnaires. Additionally, a process evaluation will shed light on whether, how and why the intervention (does not) work(s).
- Main changes (audit trail)4-jun-2014: NOTE: This study has been registered after patientinclusion closed! - AB
- RECORD7-mei-2014 - 4-jun-2014


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