Subjects: CHI-squared test; COMPARATIVE studies; MENTAL depressionCALIFORNIA; MEXICO
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Subjects: HIV prevention; SUBSTANCE abuse treatment; INTRAVENOUS drug abuseMEXICO; UNITED States
Subjects: CHI-squared test; CONFIDENCE intervals; FISHER exact testCALIFORNIA; MEXICO; UNITED States
Subjects: HIV prevention; INTRAVENOUS drug abuse; DRUG abuse risk factorsMEXICO; UNITED States
Subjects: UNDOCUMENTED immigrants; AGE distribution; CHI-squared testMEXICO; CALIFORNIA