Summary of Participation — What You Can Expect

• In-Home Visit
• Urine Sample Pick-Ups and Blood Collection

Listed below is a summary of the activities for persons enrolled in this study. During actual participation, the study staff will provide detailed instructions for each component and guide participants through the various steps. Participation takes place over approximately one week and includes one scheduled interview, collection of urine, and collection of blood samples.

In-Home Visit

The first step is for an Interviewer to meet with the study participant in his home or other location for approximately 30-45 minutes to:

• Explain the study in detail
  
  
• Review the study consent forms and sign forms
  
  
• Provide the study participant with a Participation Notebook that includes forms and questionnaires to be completed before and during the collection periods. The Notebook contains step-by-step instructions and the Interviewer provides additional instructions.
  
  
• Instruct the participant on when to do the urine collections and how to pack samples for Interviewer pick-up.
  
  
• Instruct the participant on how and when to wear the Actiwatch – a watch-like device that measures movement during sleep.
  
  
• Instruct the participant on how and when to take temperature measurements (Night Shift ONLY).
  
  
• Provide all equipment and supplies.

Urine Sample Pick-Ups and Blood Collection

These are brief, 20 minute Interviewer visits. Day Shift Workers have two Urine Pick-ups and blood collection appointments and Night Shift Workers have three. At each scheduled appointment the Interviewer will:

• Retrieve the urine samples from the participant's home or workplace
  
  
• Draw a blood sample from the participant
  
  
• Review and collect specific forms from the Participation Notebook.
  
  
• On the last Pick-up, the Interviewer will also collect any leftover supplies, the Participation Notebook and the Actiwatch