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Letters to the editor
Retinal haemorrhages and convulsions
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Editor,—The paper by Sandramouli et alsuggested that convulsions rarely, if ever, give rise to retinal haemorrhages.1 This was based on a series of 33 patients with convulsions, none of whom would seem to have had retinal haemorrhages. The statistical analysis they undertook was based on Hanley’s rule of 3.2 Its use can be summarised by their statement ‘It is a good estimate of the worst case that is compatible with the observed data’.
Applying the rule to the series …