Comparison 2. Acceptance and commitment therapy (ACT) vs TAU.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
2.1 Primary: BPD symptom severity (continuous), at end of treatment	1		Mean Difference (IV, Fixed, 95% CI)	Subtotals only
2.2 Secondary: affective instability (continuous), at end of treatment	1		Mean Difference (IV, Fixed, 95% CI)	Subtotals only
2.3 Secondary: depression (continuous), at end of treatment	1		Mean Difference (IV, Fixed, 95% CI)	Subtotals only
2.4 Secondary: attrition (dichotomous), at end of treatment	1		Risk Ratio (M‐H, Fixed, 95% CI)	Subtotals only