Patients with major depressive disorder (MDD) are known to be at a heightened risk of suicide. Research indicates that comorbid anxiety may further elevate this risk. However, studies specifically examining the prevalence of anxiety and its associated factors among patients with MDD and history of a recent suicide attempt (RSA) remain limited.

To investigate the prevalence of anxiety and the factors associated with its severity in patients with MDD.

A total of 1718 patients with MDD were included. Hypothesis testing and binary logistic regression were employed to examine differences in anxiety severity and clinical factors between patients with and without an RSA, as well as the association between anxiety severity and RSA. Subsequently, patients with MDD were categorised into three subgroups based on anxiety severity. One-way analysis of variance and multivariate logistic regression were then conducted to identify factors associated with anxiety symptoms.

Anxiety severity was identified as an independent correlate of RSA. Compared with patients with anxiety, patients with MDD and significant or severe anxiety had a 2.9-fold and 11.8-fold increased risk of RSA, respectively. Furthermore, Hamilton Rating Scale for Depression score, Positive and Negative Syndrome Scale positive subscale score, and thyroid function indices (free triiodothyronine and thyroid-stimulating hormone levels) were also determined to be independent correlates of anxiety severity.

Anxiety is associated with risk of RSA in patients with MDD, and depressive symptoms, positive psychotic symptoms and thyroid function may be related factors for severity of anxiety.