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CHEERS checklist.

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Prices health care units and productivity losses.

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Indirect medical costs (travel costs).

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Total reported units of healthcare utilization and total reported days of absenteeism and presenteeism in the ACT-group and CBT-group at over assessments.

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Mean and median incremental costs and effects of the 2,500 bootstraps.

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CONSORT 2010 checklist of information to include when reporting a randomised trial.

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Cost-effectiveness planes of the sensitivity analyses.

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Flowchart of study participants.

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Cost-effectiveness plane reflecting the probability that blended ACT is cost-effective compared to CBT in terms of treatment responders.

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Cost-effectiveness plane reflecting the probability that blended ACT is cost-effective compared to CBT in terms of QALYs (cost-utility).