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Table 1 Power calculations for the secondary outcomes

From: Collaborative care for panic disorder, generalised anxiety disorder and social phobia in general practice: study protocol for three cluster-randomised, superiority trials

Secondary outcomes Mean difference (MD) Standard deviation (SD) of the pooled mean Type 1 error Calculated power
BDI-II 4 [77] 11 [36, 77] 5% 93%
GAF-F 5a 11 [71] 5% 99%
SCL-90-R 23 [72] 50 [72] 5% 99%
  1. aFor the GAF-F the expected mean difference has been conservatively estimated to be 5 points as this is considered clinically relevant
  2. BDI Beck Depression Inventory, GAF Global Assessment of Functioning, SCL Symptom Checklist