Subjects: *STATISTICS; *FRIENDSHIP; *MOTION picturesGEORGIA
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Subjects: *CHI-squared test; *CONFIDENCE intervals; *DRINKING (Physiology)
Subjects: *EDUCATIONAL attainment; *CHI-squared test; *HEALTH behavior in adolescenceUNITED States
Subjects: *CHI-squared test; *COMMUNICATION; *CONFIDENCE intervalsMASSACHUSETTS
Subjects: *BEHAVIOR disorders in children; *ANALYSIS of variance; *CHI-squared testCHINA
Subjects: *TEENAGERS; *THAI people; *HEALTH