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Pet ownership reported by the mother in the ALSPAC cohort. (There are no data on categories ‘fish’ or ‘tortoises/turtles’ for the first two data points and so these and ‘other pets’ category have been excluded from the analysis). Total chi-squared P < 0.001 for all pet types, chi-squared for linear trend P<0.001 for all except dogs (P = 0.05).
