TABLE 3.

A descriptive summary of statistical significance levels

Author, year	Risk of bias (Appendix 1)	Intervention	PPD	CAL	Control
El‐Sharkawy et al. (2010)	Low	SRP + ω‐3 + ASA	+	+	SRP + placebo
Elkhouli (2011)	Low	SRP + ω‐3 + ASA	+	+	SRP + placebo
Deore et al. (2014)	Low	SRP + ω‐3	+	+	SRP + placebo
Salman et al. (2014)	High	SRP + ω‐3	+	□	SRP + placebo
Martinez et al. (2014)	Moderate	SRP + ω‐3	○	○	SRP + placebo
Keskiner et al. (2017)	Low	SRP + ω‐3	○	○	SRP + placebo
Umrania et al. (2017)	Low	SRP + ω‐3	○	○	SRP + placebo
Elgendy and Kazem (2018)	Low	SRP + ω‐3	+	+	SRP + placebo
Kujur et al. (2020)	Low	SRP + ω‐3	+	+	SRP
Stańdo et al. (2020)	Low	SRP + ω‐3	○	+	SRP

Note: +: Significant difference in favour of SRP + ω‐3. ○: No significant difference between groups. □: not evaluated.

Abbreviations: ASA, aspirin; CAL, clinical attachment level; PPD, probing pocket depth; SRP, scaling and root planing; ω‐3, omega‐3 fatty acids.