Table 4.

Research agenda

Topic	Questions
Unpaid work participation	How can unpaid work participation as an outcome domain be defined? Which measurement instruments are valid to assess the domain unpaid work (in IA)?
Contextual factors	How to measure contextual factor domains relevant for work participation? What is the operational definition of a ‘key’ contextual factor (eg, if it has proven to behave consistently as: (a) Relevant effect modifier of interventions in work outcome studies, or (b) Consistently relevant covariate of work outcomes in observational studies.)? To what extent are contextual factors specific to certain setting (eg, specific for a certain outcome are a certain intervention)?
Interdependence and integration of the work outcome domains	How to deal with interdependence or competition between work participation outcomes (work status, absenteeism and presenteeism)? Can we redesign work outcome measurement that integrates work disability, absenteeism and presenteeism?
Analyses of skewed data	What is the comparative accuracy of methods to deal with different types of skewed or zero-inflated data?
Decent work and healthy workplaces	What is a healthy work and what is a healthy workplace? How can we measure it? What are the health effects of not taking sick leave and not adjusting productivity while at work (presenteeism)?

IA, inflammatory arthritis.