Meta-regression revealed a strong trend towards shorter duration trials demonstrating a
greater efficacy of omega-3 fatty acids in the treatment of depression (β=-0.11 ± 0.04,
95%CI: (-0.20, -0.01), p=0.028, R2=0.37) (see Figure 4). However, this association did not
reach the strict threshold of statistical significance set forth for secondary analyses in this meta-analysis.