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. Author manuscript; available in PMC: 2021 May 10.

Published in final edited form as: Psychol Med. 2019 Oct 4;50(14):2425–2434. doi: 10.1017/S0033291719002617

Table 3.

Effects of fish oil supplementation on four domains of neuropsychological performance^a

	Week 0	Week 18	Change
		Mean (s.d.)		Cohen’s d (CI)	Between groups Cohen’s d (CI)^a
Psychomotor speed^b
Fish oil	0.040 (0.634)^c	0.125 (0.536)	0.085 (0.439)	0.145 (−0.096 to 0.386)	0.025 (−0.214 to 0.264)
Placebo	−0.038 (0.603)	0.007 (0.570)	0.044 (0.449)	0.075 (−0.162 to 0.312)	0.025 (−0.214 to 0.264)
Executive function
Fish oil	−0.019 (0.566)	0.072 (0.618)	0.090 (0.518)	0.152 (−0.089 to 0.393)	0.147 (−0.092 to 0.386)
Placebo	0.018 (0.470)	0.034 (0.626)	0.018 (0.470)	0.028 (−0.208 to 0.265)	0.147 (−0.092 to 0.386)
Learning/memory
Fish oil	0.014 (0.866)	0.177 (0.854)	0.163 (0.532)	0.190 (−0.051 to 0.431)	0.064 (−0.175 to 0.303)
Placebo	−0.012 (0.860)	0.117 (0.869)	0.129 (0.523)	0.149 (−0.088 to 0.387)	0.064 (−0.175 to 0.303)
Fluid intelligence
Fish oil	−0.017 (.847)	−0.005 (0.820)	0.012 (0.376)	0.014 (−0.226 to 0.255)	−0.062 (−0.301 to 0.177)
Placebo	0.017 (.895)	0.054 (0.829)	0.037 (0.429)	0.043 (−0.194 to 0.280)	−0.062 (−0.301 to 0.177)

^a

No comparison between groups over time reached statistical significance.

^b

Psychomotor speed is reverse scored in order that higher values indicate better performance.

^c

Performance data constitutes the averaged, standardized scores of the tests in each domain.