Vocal Acoustic Biomarkers in Depression (Speech2)

• Motoric and frequency-based change in the vocal acoustic properties of speech associated with clinical improvement measured by the Quick Inventory of Depressive Symptomatology - IVR (QIDS-IVR). [ Time Frame: baseline, week 4 & week 8 ] [ Designated as safety issue: Yes ]
  

• Multivariate logistic regression models of vocal acoustic properties optimized for sensitivity to treatment response and prediction of the response likelihood fitted to data obtained in NCT00407952. [ Time Frame: baseline, week 4, week 8 ] [ Designated as safety issue: Yes ]
  

This study will incorporate IVR data collection procedures developed in a prior pilot study into a multi-site industry-sponsored Phase 4 randomized, double-blind, placebo-controlled study (NCT00406952) using an established antidepressant at a therapeutically efficacious dose. The analytic procedures used to extract the vocal acoustic measures will be automated to facilitate near rapid turn around between speech sample acquisition and delivery of biomarker outcomes data. Multivariate models of vocal acoustic information to enhance the sensitivity of treatment response measurement and prediction of patient response likelihood will be further refined.

A total of 150 subjects will be recruited in the proposed studies, a sample of 50 from each of three targeted depressed patient populations - young adults (18-25 years old), elderly patients (60 years and older), and recent Asian immigrants with financial, linguistic, and cultural barriers to health care access. Eligible subjects will meet diagnostic criteria for Major Depressive Disorder, provide written informed consent, and will have baseline depression severity scores of 10 or greater on the QIDS. Pregnant women, women of child bearing potential not using a medically accepted means of contraception, suicidal or homicidal patients, or those with unstable medical illness including cardiovascular, hepatic, renal, respiratory, endocrine, neurological, hematological disease, or with clinical or laboratory evidence of hypothyroidism will be excluded. Patients beginning a new treatment for depression will be clinically evaluated (QIDS-C) during face-to-face interviews at the beginning of treatment (Baseline), and followed up 4 (study midpoint) and 8 weeks later (end-point). After completing the clinical interviews study participants will complete a series of IVR-based assessments using a standard desktop touch-tone telephone.