What affects how well a child responds to OCD treatment?

When a child has obsessive-compulsive disorder (OCD), the recommended psychological treatment is cognitive behavioural therapy (CBT) with exposure and response prevention. It helps a great many children. But it does not help everyone equally — less than half of those treated with CBT alone reach adequate remission of their symptoms. A fair question for any parent is: what makes the difference, and is there anything that tells us which treatment to start with?

What the research looked at

This systematic review set out to answer exactly that. The authors searched the major databases for randomised controlled trials that reported on what shaped CBT outcomes for children and adolescents with OCD. Five trials, covering 365 young people, had examined this kind of question, looking at seventeen possible factors.

It is worth being upfront about what kind of evidence this is. Most of these findings come from single trials with small numbers, analysed after the fact. The review treats them as signals worth investigating further, not settled rules.

What it found

Three factors stood out as shaping which treatment worked best.

Family history of OCD. Compared with placebo, CBT on its own was effective for children without a family history of OCD, but not for those who had one. For children with a family history, adding sertraline to CBT still helped, though the effect was somewhat reduced.

The presence of tics. For children who also had tics, CBT remained more effective than placebo while medication alone did not. But there was a twist: when a child with tics had not responded to an initial course of CBT, switching to sertraline did better than continuing CBT. For children without tics, continuing made no such difference.

Alongside these, the review identified factors that tended to predict a harder course overall: older age, more severe symptoms and impairment, additional co-occurring conditions, and family accommodation — the very natural way families adjust around the OCD to reduce a child's distress, which can inadvertently keep it going.

What this means for your family

The practical message is that treatment choices for paediatric OCD are not one-size-fits-all, and details like family history and tics are worth weighing carefully at the assessment stage. This is also why a thorough assessment matters — it is not a formality, but where these factors get considered before a plan is set. The authors were clear that these findings need replicating, so they are best understood as factors a clinician keeps in mind, not fixed predictions.

For referrers, the take-home is that a child with tics, a family history of OCD, or significant family accommodation may need a more carefully sequenced plan.

Reference Turner, C., O'Gorman, B., Nair, A., & O'Kearney, R. (2018). Moderators and predictors of response to cognitive behaviour therapy for pediatric obsessive-compulsive disorder: A systematic review. Psychiatry Research, 261, 50–60. https://doi.org/10.1016/j.psychres.2017.12.034

Led by Dr Cynthia Turner, Clinical Psychologist, The Moore Centre.

This article is general information, not a substitute for individual assessment. If a child's OCD is affecting home or school, get in touch — we see children, adolescents and adults in person at the Annerley rooms, by telephone, or by Zoom.