Detailed statistical analysis plan for the short-term versus long-term mentalisation-based therapy for outpatients with subthreshold or diagnosed borderline personality disorder randomised clinical trial (MBT-RCT)

Table 3 Power estimations of secondary dichotomous outcomes

Outcome	Expected proportion in the control group	Alpha significance level	Power	Reference
Severe self-harm incidents^a	15%	5	14%	Simonsen et al. [22]; Bateman and Fonagy [23]

^aEven though the expected power is only 14%, we define severe self-harm incidents as a secondary outcome, because it is considered very important for this population

ISSN: 1745-6215