Table ES.2. Impacts on Reading Achievement, Cohort 1 Follow-Up Respondent Sample, by First-Year Implementation Issues

Table ES.2. Impacts on Reading Achievement, Cohort 1 Follow-Up Respondent Sample, by First-Year Implementation Issues
Outcome	ERO	Non-ERO Group	Estimated Impact	Estimated Impact Effect Size	P-Value for Estimated Impact

Moderately or well-aligned implementation and longer duration

Reading comprehension
Average standard score	90.7	89.0	1.8 *	0.17 *	0.002
Corresponding grade equivalent	6.2	5.9
Corresponding percentile	26	23

Reading vocabulary
Average standard score	93.6	93.5	0.1	0.01	0.848
Corresponding grade equivalent	7.8	7.7
Corresponding percentile	32	32

Sample size	656	488

Poorly aligned implementation or shorter duration

Reading comprehension
Average standard score	89.6	89.5	0.1	0.01	0.811
Corresponding grade equivalent	6.0	6.0
Corresponding percentile	24	24

Reading vocabulary
Average standard score	93.3	92.9	0.4	0.04	0.412
Corresponding grade equivalent	7.7	7.7
Corresponding percentile	32	31

Sample size	752	517

Difference in Impacts Between Subgroups			Difference in Impacts	Difference in Impact Effect Sizes	P-Value for Difference

Differences in impacts

Reading comprehension standard score			1.6 *	0.16 *	0.035

Reading vocabulary standard score			-0.3	-0.03	0.667

NOTE: The statistical significance level is indicated (*) when the p-value is less than or equal to 5 percent.