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Table 15.3. The distribution of severity of 12-month DSM-IV disorders in the baseline
NCS (1990–92) and the NCS-R (2001–03) among respondents in the age
range 18–541
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Serious
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Moderate
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Mild
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None
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Any
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%
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(se)
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%
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(se)
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%
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(se)
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%
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(se)
|
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%
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(se)
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I. Prevalence
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1990–02
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5.3
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0.6
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12.3
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0.9
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11.8
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0.8
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70.6
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1.2
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29.4
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1.2
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2001–03
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6.3
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0.6
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13.5
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0.8
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10.8
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0.8
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69.5
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1.2
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30.5
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1.2
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II. NCS-R: NCS Risk Ratios2
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RR
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(se)
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RR
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(se)
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RR
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(se)
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RR
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(se)
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2001–03 compared to 1990–92
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1.18
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0.16
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1.1
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0.09
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0.91
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0.1
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—
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—
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1.04
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0.05
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1The retrospective classification of NCS data using DSM-IV criteria
was based on multiple imputation (MI). See the text for a discussion. Standard
errors are based on MI adjustments of design-based estimates. The association
between time and severity in the total sample is χ23 = 2.7,
p = .435.
2Risk ratios were calculated by dividing NCS-R prevalence by NCS prevalence.
As this was done using MI, the estimates reported here are the averages of the
ratios across the MI replicates. These do not necessarily equal the ratio of the
average prevalence estimates across replicates. This is why the slight discrepancies
exist between the RR estimates and the values one would obtain by calculating
the ratios of the prevalence estimates.
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