Table 2. Effect sizes and p-values of comparisons.

Absent prior experiences with effects sizes in this field conventions for the interpretation of standardized mean differences (Cohen’s d) are: 0.2 (weak effect), 0.5 (medium effect), 0.8 (strong effect). Cohen’s d was approximated from χ² and N (df:1). Bonferroni correction for multiple testing (assuming 18 comparisons) results in an adjusted p-value of 0.0028.

Comparison	Effect size (Cohen’s d)	p-value
Authors
DA 12 v DA 10	0.46	<0.00001
DMW 12 v DMW 10	0.10	0.074
Ner 12 v Ner 10	−0.11	0.079
DA 10 v DMW 10	0.30	<0.00001
DA 10 v Ner 10	0.13	0.060
DMW 10 v Ner 10	0.43	<0.00001
DA 12 v DMW 12	0.68	<0.00001
DA 12 v Ner 12	0.44	<0.00001
DMW 12 ver Ner 12	0.11	0.00017
Articles
DA 12 v DA 10	0.82	<0.00001
DMW 12 v DMW 10	0.10	0.356
Ner 12 v Ner 10	−0.18	0.113
DA 10 v DMW 10	0.40	0.002
DA 10 v Ner 10	0.15	0.264
DMW 10 v Ner 10	0.56	<0.00001
DA 12 v DMW 12	1.15	<0.00001
DA 12 v Ner 12	0.83	<0.00001
DMW 12 ver Ner 12	0.26	0.016