Shiftwork is the name of an additional questionnaire, which was an initiative from the National Institute for Public Health and the Environment (RIVM). Using QSHI, health effects of chronic circadian disturbance due to shift work or evening blue light exposure in adults are studied via self-reported questionnaire data. Self-reported data can be linked to the period where biological samples were collected in Visit 2 of General Assessment 2A, thereby creating opportunity to study biological effects of shiftwork and blue light exposure.
A similar questionnaire on blue light exposure and sleeping patterns was sent to underage participants.

PROTOCOL
Participants were asked about shiftwork and blue light exposure, specifically over the time period when they visited Lifelines for Visit 2 of General Assessment 2A (i.e. date of biomaterial donation). During the QSHI, questions about shiftwork were only presented to participants with a job >12h per week.

PERIOD
QSHI was sent out between October 2017 until January 2018.

78.292 participants were invited for QSHI
The response rate was [37]% (n=28.862).
The selection criteria were the following:

• Visited Lifelines for Visit 2 of General Assessment 2A
• Donated biomaterials collected in Visit 2 of General Assessment 2A
• 18 years or older

The following variables were collected: