Contact
If you are interested, you are welcome to contact Anne Emily Arup (aar@nfa.dk) or Kirsten Nabe-Nielsen (knn@nfa.dk).
For researchers
At the National Research Centre for the Working Environment (NFA), we have collected data for a research project about working hours and health hereby establishing the 1001 nights-cohort. Here, you can find more information about the initial research project and the cohort.
If you are interested in working with data from the project or if you have specific interests related to working hours and health, feel free to contact us (see contact information below). We also welcome bachelor and master students.
The 1001 night-cohort
For this cohort study we recruited healthy female employees working in the Danish hospital sector. The purpose of the cohort is to investigate the effect of working hours, particularly night shifts and shift work, on health outcomes. All female employees were eligible to participate regardless of their working hours as long as they worked a minimum of 28 hours per week.
On the day of enrolment, blood pressure, height, weight, hip and waist were measured, and a blood sample was taken. Background questionnaires covering personal life, working hours, sleep, health, and medication use, were distributed to the participants on the same day.
All participants were asked to complete sleep diaries for 14 consecutive days following enrolment. During the same period, the participants wore an actigraph. Furthermore, in subsamples we collected objective data on physical activity, light exposure, skin temperature, and continuous blood glucose for 7 days. Also in a subsample, saliva samples were collected across one day.
The study population consists of 1,075 females, with a mean age of 42.3 years and an average of 36.1 weekly working hours. Of these participants,
- 65.5 % worked shifts including night shifts,
- 18.5% had permanent day work,
- 8.3% worked shifts without night shifts,
- 6.9% had permanent night work,
- 0.9% had permanent evening shifts.