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Table 2 Power estimations for the secondary continuous outcomes

From: 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)

Outcome

Minimal clinically important difference

Expected standard deviation

Alpha

Sample size

Power

Reference

δ

σ

α

n

1−β

Functional impairment (WSAS)

4.5

10

5

166

82

Phillips et. al. [19]

Quality of life (SF-36—mental component)

5

11

5

166

83

Rollman et al. [20]

Global functioning (GAF)

4

8.5

5

166

85

Jørgensen et al. [21]

  1. GAF Global Assessment of Functioning, SF-36 Short-Form Health Survey 36, WSAS Work and Social Adjustment Scale