Table 2.

Estimates of screening program impact on gifted share of third graders

	Mean, 2004–2005	Mean, 2006–2007	Model 1: Difference	Model 2: Trend-Adjusted	Model 3: Trend-Adjusted Logit
School level
District vs. comparison	0.003	0.019	0.016 (0.003)**	0.016 (0.003)**
Student level
All students	0.033	0.055	0.022 (0.001)**	0.015 (0.003)**	1.451 (0.136)**
Plan A eligible	0.051	0.066	0.015 (0.002)**	0.006 (0.005)	1.108 (0.115)
Plan B eligible	0.014	0.043	0.029 (0.002)**	0.025 (0.004)**	2.743 (0.446)**
White (non-Hispanic)	0.058	0.076	0.018 (0.003)**	0.007 (0.007)	1.123 (0.128)
Black (non-Hispanic)	0.011	0.027	0.016 (0.002)**	0.009 (0.004)*	1.741 (0.462)*
Hispanic	0.021	0.057	0.036 (0.003)**	0.027 (0.006)**	2.183 (0.349)**

First row shows sample means in the pre and post years of the gap in the fraction gifted between District schools and comparison group schools in other districts, and estimates of the program impact based on the difference in differences. Remaining rows show sample means and linear probability estimates (models 1 and 2) or odds ratios (model 3) using students in District schools only (see Table 1 for sample sizes). Parentheses contain SEs, clustered by school in all models. (**P < 0.01; *P < 0.05.)