TABLE 4.

Summary of class and student-level variables

	Comparison	THSB novice	THSB experienced
Number of classes	9	10	9
Gifted and talented classes	67%	50%	44%
Number of students	196	194	184
Average pretest score (logits)	−0.15	−0.45	−0.70
Chapters of THSB completed
Range	0	2.8–3.3	3.2–4
Mean	0	2.9	3.7
Gender
Male	56%	55%	55%
Female	44%	45%	45%
Ethnicity
White	45%	41%	42%
Asian	27%	29%	22%
Black	14%	11%	23%
Hispanic	9%	10%	6%
Two or more ethnicities	6%	9%	7%
Primary language
English	89%	92%	93%
Other	11%	8%	7%