Variations in the quality and costs of end-of-life care, preferences and palliative outcomes for cancer patients by place of death: the QUALYCARE study.

Applying these to Altman's nomogram (power of 80%, significance of 0.05), it was estimated that a sample of 30 would be sufficient to detect differences in preferences of the same magnitude as in the previous London survey, 60 would allow detection of differences in the use of community nursing but a much bigger sample size 800 would be needed to detect the same differences in satisfaction with GP care (0.11 amongst home deaths and 0.19 amongst deaths elsewhere were dissatisfied with GP care, with a trend towards significance in the previous study).

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