Adjusted<sup>1</sup> odds ratios with 95% confidence intervals (95% CI) for occurrence of major depressive episode during the previous 12 months<sup>2</sup> by quartiles of fish consumption (1<sup>st</sup> quartile as a reference) stratified by alcohol consumption tertiles<sup>3</sup>, smoking and physical activity in the Health 2000 Survey.

1<p>Adjusted for age as continuous, total energy intake as continuous, level of education, marital status, smoking history, physical activity, alcohol intake (ethanol, g/day) as continuous, Body Mass Index as continuous, fish oil supplement use, current medication for depression or psychiatric disorders, occurrence of severe illness, bronchial asthma, or back pain or illness.</p>2<p>A Finnish translation of the German, computerized version of the M-CIDI interview with DSM-IV<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010530#pone.0010530-Wittchen1" target="_blank">[10]</a> sub-threshold cases included.</p>3<p>Mean (Standard Error): In men: 1<sup>st</sup> tertile 0.7 (0.03), 2<sup>nd</sup> tertile 4.6 (0.1), 3<sup>rd</sup> tertile 18 (1.0), In women: 1<sup>st</sup> tertile 0.1 (0.004), 2<sup>nd</sup> tertile 1.6 (0.02), 3<sup>rd</sup> tertile 7.4 (0.2).</p>