Abstract
Objectives
We analyze the impact of the positioning of shifts (morning, afternoon, night) on worker absenteeism in a large German automobile plant.
Methods
Using a completely balanced panel of 153 organizational units over the 2-year-period 2009 to 2010 (i.e. 104 consecutive weeks with 15,912 unit-week-observations) we estimate a series of GLM and Fixed Effects models.
Results
Our main finding is that during afternoon shifts absence rates are significantly higher than during either morning or night shifts and that absence rates are particularly high during the afternoon shift immediately following the 3 weeks of consecutive night shifts. We attribute our first finding to the “social opportunity costs” of working and the second one to a “tax evasion effect”.
Conclusions
When designing new shift models, firms should try to anticipate their workers’ reaction to avoid unintended incentives.
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Data availability
The data is proprietary and can, therefore, not be made available to other researchers.
Notes
In Germany, workers do not have to present a doctor’s certificate stating that they are unable to come to work for absence spells shorter than 3 days.
The collective bargaining agreements the company had signed with IG Metall stipulated that the compensation for working late hours is monetary and not in the form of days off.
The night shift premium in our particular case was 30% of hourly wages for the time between 8:00 pm and midnight, 45% for the time between midnight and 4:00 am and 30% for the time between 4:00 and 6:00 am [32]. This implies that not only night shifts (10:30 pm–6:30 am) were subject to a premium but also—to a lower extent—late shifts (in the time between 8:00 and 10:30 pm).
The German income tax act states that premiums of up to 25% of hourly wages for working late hours (8:00 pm–6:00 am) are exempt from income tax. Additionally, for the time between midnight and 4:00 am night work premiums of up to 40% of hourly wages are exempt from income tax.
The calculation of the monetary incentive to postpone a sickness spell is based on the average annual income of production workers in the company, the average income tax rate and the premium paid during the respective shift.
Detailed results are available from the authors upon request.
The difficulties of implementing field experiments in firms are discussed in Bandiera et al. [7]. Some of the most widely cited studies in this tradition (e.g. [6, 42] also fail to estimate difference-in-difference models as they also lack randomly selected control groups of workers for whom no change in the institutional setting was implemented.
The results are stable upon changes in the reference group.
The night work premium is a mandatory legal requirement in Germany [5]. However, the exact amount of the premium is specified in binding collective bargaining agreements.
In Germany, most employees are by law entitled to 6 weeks of sick pay covered by the employer.
The only exception here is the second night shift week (week 8) as it has significantly lower absence rates compared to all other weeks. This result remains puzzling and further analysis is required to identify the (potential) causes of this effect.
A major shortcoming of our data is—as already mentioned above—the lack of information on the age, gender, subjective health conditions and family obligations of the different team members. This is an issue insofar as Jacobsen and Fjeldbraaten [33] show that it is not shiftwork per se that is associated with worker absenteeism. Instead, there is an indirect effect particularly through work-life-conflict and perceived health.
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Frick, B., Simmons, R. & Stein, F. Timing matters: worker absenteeism in a weekly backward rotating shift model. Eur J Health Econ 21, 1399–1410 (2020). https://doi.org/10.1007/s10198-020-01232-6
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DOI: https://doi.org/10.1007/s10198-020-01232-6