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Table 8.2 2003 NSDUH Phone Verification Results—Non-interview Cases<br />

Screening Cases<br />

Selected for Phone<br />

Results of Phone Verification of Non-interview Cases<br />

No Problem<br />

Error/Other*<br />

Unable to Contact/<br />

Unresolved<br />

Verification Count Percent Count Percent Count Percent<br />

Q1 3,854 2,948 76% 311 8% 595 15%<br />

Q2 3,764 2,783 74% 310 8% 671 18%<br />

Q3 2,931 2,224 76% 275 9% 432 15%<br />

Q4 2,877 2,084 72% 218 8% 575 20%<br />

TOTAL 13,426 10,039 75% 1,114 8% 2,273 17%<br />

* Included in the "Other" category are cases which were also selected for field verification (Q1-23, Q2-4, Q3-5, Q4-<br />

4) <strong>and</strong> also cases which, through telephone verification, were categorized as "invalid" due to discovered breaches of<br />

protocol that meant the data could not be used (Q3-1, Q4-2).<br />

Table 8.3 2003 NSDUH Phone Verification Results—Interview Cases<br />

Interview Cases<br />

Selected for Phone<br />

No Problem<br />

Results of Phone Verification of Interview Cases<br />

Error/Other*<br />

Unable to Contact/<br />

Unresolved<br />

Verification Count Percent Count Percent Count Percent<br />

Q1 4,494 3,669 82% 255 6% 570 13%<br />

Q2 4,474 3,511 78% 272 6% 691 15%<br />

Q3 4,060 3,416 84% 217 5% 427 11%<br />

Q4 3,866 3,054 79% 205 5% 607 16%<br />

TOTAL 16,894 13,650 81% 949 6% 2,295 14%<br />

* Included in the "Other" category are cases which were also selected for field verification (Q1-14, Q4-2) <strong>and</strong> also<br />

cases which, through telephone verification, were categorized as "invalid" due to discovered breaches of protocol<br />

that meant the data could not be used (Q1-2, Q3-2, Q4-2).<br />

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