The association for the younger age group became slightly stronger after excluding information provided by proxy respondents (OR for two pesticides was 3.69, 95 % CI 1.12–12.15). For GABA eceptors-gated chloride channel inhibitors, the OR was increased for use of two or more of such pesticides (OR 2.45, 95 % CI 0.47–12.92), but there were only two exposed cases and the increase was not statistically significant.