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7. Data Collection Results
7.1 Overview
By following the data collection procedures already discussed, 170,762 units were
selected. During the screening process, 143,485 units were identified as eligible, that is, the units
were not vacant or only occupied by active-duty military personnel, or other similar
circumstances. From this number of eligible cases, 130,605 were then screened successfully. The
selection procedure in the Newton yielded 81,631 sample eligible dwelling units (DU) members.
From this number, a total of 67,784 interviews were then completed.
7.2 Screening Response Rates
The screening response rate is the number of completed screenings divided by the Total
screened dwelling units (SDUs) minus those SDUs not eligible to be included in the National
Survey on Drug Use and Health (NSDUH). Ineligibles include vacants, not primary residence,
not a DU, group quarters unit (GQU) listed as housing unit (HU), HU listed as GQU, only
military, other ineligibles, and those SDUs where the residents will live there less than half of the
quarter.
As a brief summary, Table 7.1 lists the sample totals and the national screening and
interview response rates for the 2001, 2002, and 2003 surveys. Then, Tables 7.2 through 7.15
present the screening response rates for the 2003 sample nationwide. Within each pair of tables,
the first provides the unweighted percentages, while the second provides the weighted
percentages. The final national screening response rates for the 2003 NSDUH were 91.02
percent (unweighted) and 90.72 percent (weighted).
Tables 7.2 and 7.3 show the national totals for the various screening results codes as
broken down by population density. Tables 7.4 and 7.5 redistribute the complete and incomplete
screening results codes shown in the previous two tables. The next sets of tables list results for
each State, broken down by population density (7.6 and 7.7), eligibility rate (7.8 and 7.9),
completion rate (7.10 and 7.11), and nonresponse rate (7.12 and 7.13). Tables 7.14 and 7.15
show the reasons given for screening refusals for the national totals and then, in alphabetical
order, for each State. Both unweighted and weighted tables are presented together for each State.
7.3 Interview Response Rates
The interviewing response rate is the number of completed interviews divided by the total
number of eligible respondents chosen through screening. If there are any ineligible respondents
(under 12 or actually in the military), these are subtracted from the total. The national rates for
2001, 2002, and 2003 are shown in Table 7.1. The effect of the $30 cash incentive implemented
for 2002 and 2003 is apparent when comparing between survey years.
Tables 7.16 through 7.27 present the interview response rates for the national sample.
The final national interviewing response rates were 83.04 percent (unweighted) and 77.39
percent (weighted).
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