Table 1.

Conversion of Cohen’s d scores to percentiles⁵

COHEN’S d	PERCENTAGE OF CONTROL GROUP WHO WOULD HAVE A SCORE BELOW THE AVERAGE SUBJECT IN THE EXPERIMENTAL GROUP
0.0	50
0.1	54
0.2	58
0.3	62
0.4	66
0.5	69
0.6	73
0.7	76
0.8	79
0.9	82
1.0	84
1.2	88
1.4	92
1.6	95
1.8	96
2.0	98
2.5	99
3.0	99.9