Erratum for McLeod LD et al. Best (but oft-forgotten) practices: expressing and interpreting associations and effect sizes in clinical outcome assessments. Am J Clin Nutr 2016;103:685–93

Erratum for McLeod LD et al. Best (but oft-forgotten) practices: expressing and interpreting associations and effect sizes in clinical outcome assessments. Am J Clin Nutr 2016;103:685–93.

On page 688 of the above article, Table 1 presented incorrect formulas. The corrected table has been provided.

TABLE 1.

Common effect size formulas¹

Formula	Method	Example
	Cohen’s d
	Hedges’s g approximate
	Glass’s
	Effect size estimate of change
	Standardized response mean
	Guyatt’s responsiveness statistic

¹In the example, there are 2 groups: group 1 and group 2. Group 1 is the treatment group, and group 2 is considered the control group. mean_group1 = 5, mean_group2 = 4, n_group1 = 120, n_group2 = 220, SD_group1 = 2, SD_group2 = 3, mean_follow-up = 10, mean_baseline = 5, SD_baseline = 5, SD_change = 2, SD_{change in stable group} = 3.