Table 3.

Treatment intensity conditions.

Intensity	Treatment (five books, 30 words)		Untreated control (five books, 30 words)		Treatment time (two to three sessions/week)
	Dose	Dose frequency	Dose	Dose frequency	Sessions	Weeks
12	3	4	0	0	10	4–5
24	4	6	0	0	15	5–8
36	6	6	0	0	15	5–8
48	6	8	0	0	20	7–10

Note. Children were randomized to intensities in blocks such that four children were enrolled in a block and each child was randomized to a different intensity. For a given child, half the books and words were randomly assigned to the treatment condition and the other half were assigned to an untreated control condition. Dose is the number of exposures to a target word in a book; dose frequency is the number of repeated readings of a book across time.