Table 2.

Means (SDs) and ranges on all outcome measures at t1, t2 and t3 for the control and experimental groups

Outcome measure (maximum)	Reliability	Test point	Control		Experimental
			Mean	Range	Mean	Range
Letter knowledge (32)	.98a	t1	28.59 (4.59)	8–32	27.53 (3.79)	14–32
		t2	29.68 (4.05)	6–32	30.09 (2.70)	17–32
		t3	30.71 (3.13)	11–32	30.68 (2.20)	19–32
Phoneme awareness (12)	.64–.78b	t1	8.91 (2.93)	0–12	7.97 (2.88)	0–12
		t2	9.38 (3.09)	0–12	10.30 (2.04)	2–12
		t3	10.73 (2.30)	1–12	10.97 (1.8)9	1–12
Sound deletion (12)	.93a	t1	5.63 (2.65)	0–12	5.74 (2.03)	1–10
		t2	6.84 (2.24)	2–11	6.57 (2.45)	0–11
		t3	7.60 (2.68)	0–12	7.55 (2.26)	1–12
Early word reading (30)	.98a	t1	16.13 (8.50)	0–29	16.70 (8.34)	1–30
		t2	19.41 (8.57)	0–30	20.97 (7.07)	4–30
		t3	23.09 (7.90)	0–30	23.74 (6.55)	1–30
Single word reading (60)	.98a	t1	9.43 (7.56)	0–28	9.60 (7.65)	0–32
		t2	13.35 (9.49)	0–36	13.96 (8.33)	0–33
		t3	18.38 (10.71)	0–40	18.62 (9.95)	0–40
Nonword reading (20)	.96a	t1	4.46 (4.89)	0–16	3.67 (4.01)	0–14
		t2	6.29 (5.66)	0–19	5.69 (4.57)	0–18
		t3	8.19 (5.70)	0–20	8.17 (5.49)	0–20
Prose reading accuracy (48)†	.75–.87a	t1	36.62 (10.27)	9–48	37.23 (9.27)	10–48
		t2	30.41 (13.94)	2–48	28.97 (12.77)	3–48
		t3	22.18 (15.10)	0–48	22.18 (14.34)	0–46
Orthographic spelling (10)	.66–.76	t1	2.62 (1.73)	0–7	3.14 (1.73)	0–10
		t2	3.47 (1.72)	0–8	3.74 (1.83)	0–9
		t3	4.40 (2.39)	0–10	4.55 (2.12)	0–10
Phonetic spelling (92)	.87–.92b	t1	72.24 (22.83)	0–92	78.21 (18.08)	0–92
	.99c	t2	80.34 (17.65)	0–92	82.96 (13.23)	0–92
		t3	81.79 (19.87)	0–92	86.08 (11.45)	0–92
Expressive vocabulary (54)	.85a	t1	25.66 (9.26)	2–46	26.56 (9.51)	2–47
		t2	29.12 (9.22)	2–44	29.31 (8.29)	10–48
		t3	31.29 (9.27)	2–50	31.05 (8.88)	6–50
Taught vocabulary weeks 1–9 (36)	.73–.84b	t1	13.28 (5.21)	0–26	13.21 (5.02)	0–23
		t2	14.87 (5.69)	0–27	17.06 (5.29)	2–29
		t3	18.34 (5.45)	0–27	17.26 (5.45)	2–28
Taught vocabulary weeks 10–18 (36)	.73–.84b	t1	14.88 (4.83)	0–25	14.12 (5.13)	0–25
	.83–.90d	t2	16.00 (5.17)	0–27	16.06 (4.74)	5–25
		t3	17.81 (5.23)	0–28	18.36 (5.53)	0–30
Listening comprehension (17)	.65–.71b	t1	7.15 (2.97)	0–14	7.22 (2.76)	2–13
		t2	8.71 (3.06)	0–14	8.60 (2.40)	4–14
		t3	9.00 (2.78)	1–15	9.16 (2.70)	2–14
Reading comprehension (24)	.62–.77a	t1	6.28 (5.50)	0–21	5.89 (4.46)	0–18
		t2	8.94 (6.22)	0–21	9.58 (5.90)	0–23
		t3	11.68 (6.14)	0–21	12.17 (5.99)	0–22
Sessions attended (45)		t1–t2	0.00 (0.00)	0–0	36.18 (7.64)	0–46
		t2–t3	39.10 (4.99)	24–46	33.01 (13.39)	0–47

^†Lower scores denote fewer errors and therefore greater accuracy.

^aInternal reliability (α).

^bTest/retest reliability.

^cIntrarater reliability.

^dInterrater reliability.