The prognostic value of a screening tool for psychological risk factors after mild traumatic brain injury: prospective studies in Canada and New Zealand.

OBJECTIVE

To investigate the prognostic value of the Subgroups for Targeted Treatment (STarT) Screening Tool adapted for concussion (STarT-C) on persistent symptoms and disability at 6-9 months following mild traumatic brain injury (mTBI).

DESIGN

Secondary analysis of two prospective studies: an observational cohort study in New Zealand and usual care control arm of a clinical trial in Canada (ClinicalTrials.gov Registry (NCT04704037)).

SETTING

Participants in the New Zealand cohort were recruited from concussion clinics (five sites) and those in the Canadian cohort were recruited from emergency departments/urgent care centres (eight sites).

PARTICIPANTS

New Zealand participants (n=93, median age 37 years, 60% women) were assessed at median=6 weeks post-injury (T1) and 6 months later (T2). Canadian participants (n=223, median age 38 years, 56% women) were assessed at median=2 weeks (T1) and 6 months later (T2).

MAIN OUTCOME MEASURES: Symptoms at T2 were assessed using the validated Rivermead Postconcussion Symptoms Questionnaire (RPQ) and disability using the WHO Disability Assessment Schedule 2.0 12-item Interview.

RESULTS

In linear regression analyses, the STarT-C predicted symptom burden (R2=18-36%) and disability (R2=15-18%) at T2 in both cohorts. While the additional prognostic value over and above baseline variables was substantial (delta R2 8-40%), the additional prognostic value over the RPQ at T1 was variable and generally lower (delta R2=1-9%).

CONCLUSION

The STarT-C-a brief screening tool-predicted persistent symptoms and disability in adults following mTBI. The incremental prognostic value of the STarT-C over the RPQ may be variable, but regardless, the tool may be useful for identifying those at risk of prolonged recovery who may benefit from early psychological intervention.