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Table 6.20 2003 NSDUH CAI Audit Trail Timing Data: Prior Marijuana <strong>and</strong> Cigarette Use Section<br />

Age Category 12-17 18 +<br />

Year of Interest 2001 2002 2003 2001 2002 2003<br />

Sample Size N/A N/A 6,979 N/A N/A 30,669<br />

Summary Statistics (Minutes)<br />

Mean (F) N/A N/A 0.6 N/A N/A 0.7<br />

Variance (σ 2 ) N/A N/A 0.1 N/A N/A 0.3<br />

St<strong>and</strong>ard Deviation (σ) N/A N/A 0.4 N/A N/A 0.6<br />

Quartiles<br />

Maximum N/A N/A 6.7 N/A N/A 28.5<br />

Q3 N/A N/A 0.7 N/A N/A 0.9<br />

Median N/A N/A 0.5 N/A N/A 0.6<br />

Q1 N/A N/A 0.3 N/A N/A 0.4<br />

Minimum N/A N/A 0.0 N/A N/A 0.0<br />

Range N/A N/A 6.7 N/A N/A 28.5<br />

Mode N/A N/A 0.3 N/A N/A 0.3<br />

Percentiles<br />

Extremes<br />

99% N/A N/A 1.8 N/A N/A 2.5<br />

95% N/A N/A 1.2 N/A N/A 1.5<br />

90% N/A N/A 1.0 N/A N/A 1.2<br />

10% N/A N/A 0.2 N/A N/A 0.3<br />

5% N/A N/A 0.2 N/A N/A 0.2<br />

1% N/A N/A 0.1 N/A N/A 0.1<br />

5 Highest Values (Highest) N/A N/A 6.7 N/A N/A 28.5<br />

N/A N/A 6.5 N/A N/A 27.3<br />

N/A N/A 5.6 N/A N/A 14.6<br />

N/A N/A 5.5 N/A N/A 12.4<br />

N/A N/A 4.5 N/A N/A 11.7<br />

5 Lowest Values N/A N/A 0.0 N/A N/A 0.0<br />

N/A N/A 0.0 N/A N/A 0.0<br />

N/A N/A 0.0 N/A N/A 0.0<br />

N/A N/A 0.0 N/A N/A 0.0<br />

(Lowest) N/A N/A 0.0 N/A N/A 0.0<br />

Note: Time recording begins at LU01 <strong>and</strong> stops recording after LUCC10 in the Prior Marijuana <strong>and</strong> Cigarette Use<br />

Module. This Module is a new addition in 2003.<br />

91

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