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working in and around their campuses. Most of these situations resulted in packages being sent
that contained:
1. RTI Institutional Review Board (IRB) information;
2. Office of Management and Budget (OMB) approval information;
3. descriptive information about the procedures and data collection plan; and
4. various descriptive study materials used with respondents during data collection.
Included with all letters and packets was an endorsement letter signed by the presidents of Duke
University and the University of North Carolina at Chapel Hill. In the end, all of the private
educational institutions expressing concerns cooperated in the C/L phase of the 2003 NSDUH.
2.5.2 Segments with Reassigned Quarters
Thirty segments were identified during the C/L phase as difficult to access during months
with unusual weather. Including 9 overlap segments from the 2002 study, there were a total of 39
segments in 2003 with access issues. Most involved roads made impassable by snow during the
winter months. Others involved roads inaccessible due to rain, and one or two isolated locations
involved water-only access that often froze during the winter months. If segments with weather
or geographic access problems were selected for a quarter in which the access would be a
problem (generally Quarters 1 or 4), the segment was switched with a segment in the same
region for an appropriately paired time period. For example, inaccessible first quarter segments
were switched with second quarter segments in the same region that would be more accessible
during the first quarter; fourth quarter segments were switched with more easily accessed third
quarter segments. Generally the "switched" segment was selected because it had more accessible
road surfaces, was more urban, or had fewer inaccessible roads.
In a few locations, such as some areas in Alaska, there were no segments that were better
for reassignment during the problematic time period. When that happened, staff made prompt
assignments, emphasized early completion of the work, and tried to plan around good weather
forecasts to accomplish the field work as early in the period as possible.
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