TABLE 1.

Existing meta-analyses investigating the factor feedback.

Authors	Year	Status	Access to effect sizes and sample sizes
Azevedo and Bernard	1995	Included	From meta-analysis
Bangert-Drowns et al.	1991	Included	From meta-analysis
Biber et al.	2011	Included	From meta-analysis
Brown	2014	Excluded	Data not available
Getsie et al.	1985	Excluded	No effect sizes indicated; no individual references provided
Graham et al.	2015	Partially included	From meta-analysis
Kang and Han	2015	Included	From meta-analysis
Kluger and DeNisi	1996	Partially included	Original data received from authors; studies that do not deal with educational context excluded
Kulik and Kulik	1988	Partially included	33 sample size values missing; reconstruction from the primary studies not possible
L’Hommedieu et al.	1990	Included	From meta-analysis
Li	2010	Included	From meta-analysis
Lysakowski and Walberg	1980	Excluded	No effect sizes indicated, effect sizes and sample sizes not reconstructable from original studies
Lysakowski and Walberg	1981	Partially included	44 of 54 primary studies excluded because they do not deal with feedback on the relevant outcomes effect sizes reconstructed from primary studies
Lyster and Saito	2010	Partially included	Effect sizes reconstructed from original studies
Menges and Brinko	1986	Partially included	Missing values reconstructed from primary studies
Miller	2003	Included	Updated set of studies was used (Miller and Pan, 2012), instead of the eleven effects from eight studies used by Miller (2003), 31 effects from 13 studies were integrated
Neubert	1998	Partially included	Effect sizes/sample sizes reconstructed from primary studies
Rummel and Feinberg	1988	Partially included	38 of 45 studies excluded because they do not deal with the relevant outcomes
Russell and Spada	2006	included	From meta-analysis
Schimmel	1983	Excluded	Data not available
Skiba, Casey, and Center	1985	Excluded	Data no longer available (even directly from authors)
Standley	1996	Partially included	82 of 98 studies excluded because they do not deal with a school context
Swanson and Lussier	2001	Partially included	Effect sizes/sample sizes reconstructed from primary studies
Tenenbaum and Goldring	1989	Included	Statistical data from meta-analysis, but no references of integrated studies provided
Travlos and Pratt	1995	Partially included	From meta-analysis
Truscott	2007	Included	From meta-analysis
van der Kleij et al.	2015	Included	From meta-analysis
Walberg	1982	Excluded	No effect sizes and sample sizes indicated; reconstruction of data no longer possible
Wiersma	1992	Partially included	10 of 20 studies excluded because they do not deal with an educational context
Wilkinson	1981	Excluded	Data not available
Witt et al.	2006	Excluded	No data on feedback effects
Yeany and Miller	1983	Partially included	45 of 49 studies excluded because data was not reconstructable