Results of the multivariate analysis examining the association of questionnaire domain and unusable data.

CES-D: Center for Epidemiologic Studies Depression Scale.
AUDIT: Alcohol Use Disorders Identification.
STDs: Sexually Transmitted Diseases.
ACASI: Audio Computer Assisted Self-Interview.
SAQ: Self-Administered Questionnaire.
Relative risks >1 indicate that SAQ users were more likely to have unusable data than ACASI users.
Unusable data is defined as answering less than 75% of the questions for the particular domain.