The telephone survey center is operated 7 days a week, usually from 9:00 am to 9:30 PM, with scheduled interviews occurring throughout the day. Call back interviews can be scheduled for any time during the day or evening. Experience has shown that the evening and weekend hours tend to be best for reaching subjects at home, and many of the center's interviewing hours are scheduled during these times. The volume of available workstations in operation is periodically adjusted to correspond to the rates of successful contact found throughout the day.
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