Odds ratios with 95% confidence intervals (95%CI) for occurrence of depressive episodes during the previous 12 months1 by quartiles of fish consumption (1st quartile as a reference) in the Health 2000 Survey and the Fishermen Study men.

FFQ = Food Frequency Questionnaire.1In the Health 2000 Survey, major depressive episodes (MDE) measured by a Finnish translation of the German, computerized version of the M-CIDI interview with DSM-IV[10] sub-threshold cases included. In the Fishermen Study, depressive episodes measured by the CIDI-SF stem questions ‘During the previous 12 months, have you felt sad, blue or depressed for at least 2 weeks?’ and ‘During the previous 12 months, have you lost interest in most things like work or hobbies or things you usually like to do for fun for at least two weeks?[16]. A person was considered to have depressive episodes if she/he answered ‘yes’ to both questions.2Adjusted for age as continuous, total energy intake for fish consumption g/day as continuous, Body Mass Index as continuous (self-reported for consumption of fish times/month), level of education, marital status, smoking history, physical activity, alcohol intake (ethanol, g/day) for fish consumption g/day as continuous, alcohol induced intoxication for consumption of fish times/month, fish oil supplement use for fish consumption g/day, current medication for depression or psychiatric disorders, occurrence of severe illness, bronchial asthma, or back pain or illness.3Adjusted as in footnote 2 but without current medication for depression or psychiatric disorders4Self-reported Body Mass Index.