What exactly were the hazard ratios?
• Pascale Barberger-Gateau, senior lecturer Université Bordeaux 2, 33076 Bordeaux Cedex, France The baseline category used for the estimation of the hazard ratios for the risk of dementia as a function of fish or meat consumption included all those who ate respectively fish or meat less than once a week. Very few subjects never ate fish or meat indeed, so we lacked vegetarians in our sample to conduct a specific study on this group. The PAQUID participants were representative in terms of age and sex of the local community dwellers aged 65 and over at baseline. When the never consumers were excluded from the analyses, the age- and sex- adjusted hazard ratio of dementia for weekly fish consumers was almost unchanged : 0.69 with a slightly wider 95% confidence interval (0.47 to 1.00) because of the smaller sample size. For meat consumption, the p for trend was even less significant (0.83) when the 6 subjects who never ate meat were excluded. Competing interests: None declared Submit rapid
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