Relative risk of positive psychotic-like symptoms in relation to estimated dietary intake of all fish and seafood 4. 1Relative risk (RR) and 95% confidence interval evaluated by multinomial logistic regression, adjusted for age, total energy intake and dietary intake of vegetables, vitamin B12 and alcohol. 2 The group with no or low level of psychotic symptoms was used as reference group. 3 Participants categorized into levels; no/low, middle, high frequency of psychotic-like symptoms. 4 Total intake of all fish and seafood were grouped into six categories; none, 1-3 times per month, once per week, twice per week, 3-4 times per week and 5 times per week or more.