4. Sensitivity analysis for strength of correlation of imputed standard deviations for change scores in our secondary outcome naming nouns.

Analysis	Studies with imputed SDs for change scores	Strength of mean correlation for experimental and control group	Analysis results
1.3	Polanowska 2013; Spielmann 2016; Turkeltaub 2017	0.976 (observed)	SMD 0.42, 95% CI 0.19 to 0.66; 298 participants; 11 studies; I² = 0%
		0.8	SMD 0.31, 95% CI 0.07 to 0.54; 298 participants; 11 studies; I² = 0%
		0.6	SMD 0.29, 95% CI 0.05 to 0.52; 298 participants; 11 studies; I² = 0%
1.4	Spielmann 2016	1.0 (observed)	SMD 0.87, 95% CI 0.25 to 1.48; 80 participants; 2 studies; I² = 32%
		0.8	SMD 0.69, 95% CI −0.40 to 1.77; 80 participants; 2 studies; I² = 76%
		0.6	SMD 0.66, 95% CI −0.48 to 1.80; 80 participants; 2 studies; I² = 78%

SD: standard deviation

The correlation coefficients have been obtained from Meinzer 2016, which presented both total values and change scores for our secondary outcome naming performance in naming nouns.