Early outcomes, associated factors and predictive values of clinical outcomes of tandospirone in generalized anxiety disorder: a post-hoc analysis of a randomized, controlled, multicenter clinical trial

Abstract

Objective To examine the early outcomes, associated factors and predictive values of clinical outcomes of different tandospirone doses in patients with a generalized anxiety disorder (GAD). Methods This was a posthoc analysis of “a randomized, controlled multicenter clinical trial of the efficacy and safety of different doses of tandospirone on GAD”. A total of 274 patients with GAD were included and randomized into the high-dose (tandospirone 60 mg/d) and low-dose (tandospirone 30 mg/d) groups for a 6-week treatment. The Hamilton Anxiety (HAMA), Clinical Global Impression-Severity (CGI-S), Short-Form-12 (SF-12) scales were used for assessment. The trial was registered at clinical trail.gov (NCT01614041). Results (1) In the first week of treatment, 35.8% of patients in the high-dose group fulfilled the early onset criteria, which was significantly higher than 19.0% found in the low-dose group (p = 0.002). In the second week of treatment, 22.6% of patients in the high-dose group achieved an early response, versus 12.4% in the low-dose group, indicating a significant difference (p = .026). (2) Factors associated with early onset at week 1 included baseline HAMA total score (OR = 0.916, 95%CI 0.882–0.952), age (OR = 0.974, 95%CI 0.950–0.998), drug dose (30 mg vs. 60 mg; OR = 0.298, 95%CI 0.156–0.568) and SF-12 physiological total score (OR = 1.030, 95%CI 1.010–1.050). (3) Early onset was significantly associated with response rate (OR = 18.34, 95%CI 12.10–27.81), remarkable response rate (OR = 27.56, 95%CI 11.65–65.17) and recovery rate (OR = 11.85, 95%CI 4.98–28.18). Group (high dose group vs. low dose group) (χ 2 = 8.535, p = .003) and baseline HAMA total score (χ 2 = 70.840, p < .001) were independent predictors of onset time. Conclusions The early outcomes of high-dose tandospirone in the treatment of GAD are better than those of the low-dose group. Patients with younger age at onset, milder anxiety symptoms and better physiological functions administered high-dose tandospirone showed rapid onset, great early outcomes, high recovery rate and good prognosis. Drug onset time had a good predictive effect on treatment outcome.