General Practice
A randomised controlled trial and economic evaluation of a referrals facilitator between primary care and the voluntary sector
BMJ 2000; 320 doi: https://doi.org/10.1136/bmj.320.7232.419 (Published 12 February 2000) Cite this as: BMJ 2000;320:419
Data supplement
- Sample size
Our sample of 161 provides 89% power, at the two sided 5% level, to detect a difference of 2.0 points on the hospital anxiety and depression scale, based on a standard deviation of 4.0. This standard deviation was based on data from a similar patient population.1 A difference of two points on the hospital anxiety and depression scale was the minimum considered clinically significant.
- Harvey I, Nelson SJ, Lyons RA, Unwin C, Monaghan S, Peters TJ. A randomised controlled trial and economic evaluation of counselling in primary care. Br J Gen Pract 1998;48:1043-8.
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