Department of Psychiatry
Penn Behavioral Health

HIV/AIDS Prevention Research Division

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Risk Assessment Battery (RAB)

Psychometrics

Studies conducted by the authors and others suggest that when properly administered, the RAB responses are equivalent to those collected via personal interview. Test-retest reliability has also been found to be relatively high. Importantly, the RAB has demonstrated discriminant validity in differentiating between respondents engaging in different drug use patterns and predictive validity in identifying seroconverters on the basis of higher risk scores.


Internal consistency

  • Drug risk score: Cronbach alpha = .82
  • Sex risk score: Cronbach alpha = .42


Factor/cluster analysis

  • Factor structure was examined in developing drug and sex risk scales


Reliability


Test-retest
Population Drug Risk Sex Risk
Methadone .80 .69
Cocaine .73 .88

 


Inter-method Comparison: NIDA AIDS Follow-up Assessment [AFA] and RAB
Item % Reporting
on RAB
% Reporting
on AFA
Exact Agreement Phi Kappa
Drug Risk
Injected 62.7 63.5 96.6 .93 .93
Shared Syringes 18.9 16.9 94.5 .81 .81
Shared w/ Multiple IDUs 4.7 4.5 96.6 .61 .61
Shared Cotton 30.6 25.1 88.9 .76 .75
Shared Cooker 34.1 33.6 92.7 .84 .84
Shared Rinse Water 28.1 24.4 88.5 .70 .70
Sex Risk
Sex w/ Multiple Partners 24.5 24.3 96.6 .91 .91
Always Use Condoms 28.9 20.4 85.8 .64 .62

 

 

Construct Validity

  • Significantly higher drug risk scores for methadone program patients as compared to cocaine users in treatment
  • Significantly higher sex risk scores for cocaine users as compared to IDUs


Predictive Validity

  • Compared risk scores of IDUs who seroconverted at any time point with IDUs who remained seronegative; by follow-up month (M)
RAB Seroconverted IDUs Who Remained Seronegative by Follow-up Month
Risk Score n=17 12M
n=137
18M
n=140
24M
n=139
30M
n=137
36M
n=135
42M
n=137
48M
n=142
Drug Risk 5.75 3.31* 2.66* 2.27* 1.99* 2.27* 2.23* 1.84*
Sex Risk 5.18 4.18 4.05 3.67 3.60 3.31* 3.34* 3.13*
RAB Total 10.94 7.59* 6.74* 5.96* 5.64* 5.61* 5.59* 4.95**

* p<.05; **p<.005

 

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