Managing Rumination and worry: A randomised controlled trial of an internet intervention targeting repetitive negative thinking delivered with and without clinician guidance

Background: Rumination and worry, forms of repetitive negative thinking (RNT), are implicated in the onset, maintenance, severity, and relapse risk of depression and anxiety disorders. This randomised controlled trial evaluated an internet intervention targeting both rumination and worry in adults compared to treatment-as-usual (TAU) and compared treatment effects and adherence when delivered with and without clinician guidance. Methods: Adults (N = 137) with elevated RNT were randomly allocated to a 3-lesson clinician guided (n = 45) or self-help (n = 47) online program delivered over 6 weeks, or a TAU control group which waited 18 weeks to receive the program (n = 45). The clinician guided group received semi-structured phone support after each lesson. All three groups continued any pre-trial TAU. RNT, anxiety, depression, and psychological distress were assessed at baseline, post-treatment (week 7), and 3-month follow-up. Results: Intention-to-treat linear mixed models showed that participants in the self-help and clinician guided groups had significantly lower RNT, anxiety, depression, and distress at post-treatment and 3-month follow-up compared to TAU. Treatment effects were significantly larger in the clinician guided group compared to selfhelp (between-group gs = 0.41-0.97). No significant between-group differences were found in adherence/program completion (guided: 76%; self-guided: 79%) or treatment satisfaction (1-5 scale: guided: M = 4.17, SD = 1.20; self-guided: M = 3.89, SD = 0.93). Total time spent on clinician guidance was M = 48.64 min (SD = 21.28). Conclusion: This brief online intervention for RNT is acceptable and efficacious in reducing RNT, anxiety, depression, and distress in both clinician guided and self-help formats. The program appeared most effective when delivered with clinician guidance. Larger definitive trials comparing guided and self-guided programs are needed. Australian and New Zealand Clinical Trials Registration number: ACTRN12620000959976.