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Table 6.21 2003 NSDUH CAI Audit Trail Timing Data: Special Topics, Drug Treatment and
Health Care Sections
Age Category 12-17 18 +
Year of Interest 2001 2002 2003 2001 2002 2003
Sample Size 7,560 22,832 21,854 15,208 42,781 43,451
Summary Statistics (Minutes)
Mean (F) 2.1 2.1 2.1 2.5 2.6 2.6
Variance (σ 2 ) 1.5 1.6 1.3 4.0 2.7 2.7
Standard Deviation (σ) 1.2 1.3 1.2 2.0 1.7 1.7
Quartiles
Maximum 21.8 41.4 19.8 152.7 50.7 40.3
Q3 2.4 2.4 2.4 2.9 2.9 3.0
Median 1.8 1.8 1.9 2.1 2.2 2.2
Q1 1.4 1.4 1.5 1.6 1.7 1.7
Minimum 0.0 0.0 0.0 0.0 0.0 0.0
Range 21.8 41.4 19.8 152.7 50.7 40.3
Mode 1.5 1.5 1.7 1.9 1.7 1.9
Percentiles
Extremes
99% 7.0 7.3 6.8 8.8 9.1 9.1
95% 4.0 4.0 4.0 5.1 5.3 5.3
90% 3.2 3.2 3.2 4.1 4.1 4.1
10% 1.1 1.2 1.2 1.2 1.3 1.3
5% 1.0 1.0 1.0 1.1 1.2 1.2
1% 0.7 0.8 0.8 0.8 0.9 0.9
5 Highest Values (Highest) 21.8 41.4 19.8 152.7 50.7 40.3
15.1 38.8 17.8 37.9 41.5 36.2
15.0 35.1 17.5 31.5 39.2 34.4
14.8 25.1 17.3 30.8 35.9 31.1
14.5 19.1 17.1 25.7 32.9 30.5
5 Lowest Values 0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
(Lowest) 0.0 0.0 0.0 0.0 0.0 0.0
Note: Time recording begins at INTROSP in the Special Topics Module and stops recording after PROBTYPE in
the Health Care Module. The Market Information for Marijuana and Prior Marijuana And Cigarette Use
Modules are embedded between Special Topics and Drug Treatment, but are not included in these timing
calculations.
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