. 2018 Jul 11;9:1187. doi: 10.3389/fpsyg.2018.01187

Table 3.

Performance at pretest, post-test and follow-up scores and mean differences.

Group	Math (N = 69)		R (N = 85)		C (N = 69)		Paired comparison
	M	SD	M	SD	M	SD	Math vs. C	Math vs. R
Fact retrieval
Pre	8.59	4.31	15.73	3.40	NA	NA		Math < R; F(1,139) = 73.66^∗∗∗a
Post	15.59	2.80	17.05	2.81	NA	NA		Math < R; F(1,138) = 3.14 ns^a
Follow-up	14.82	3.36	17.03	3.41	NA	NA		Math < R; F(1,132) = 7.10^∗∗a
Addition
Pre1	15.84	5.56	29.96	11.28	20.16	5.00	Math < C; t(136) = −4.82^∗∗∗	Math < R; F(1,141) = 39.25^∗∗∗a
Pre2	19.30	5.67	31.04	11.94	23.07	5.61	Math < C; t(126) = −3.78^∗∗∗	Math < R; F(1,137) = 21.37^∗∗∗a
Post	26.40	8.86	36.01	14.70	27.32	7.26	Math = C; t(126) = −0.64 ns	Math < R; F(1,140) = 4.13^∗a
Follow-up	26.13	8.68	39.40	14.60	30.53	9.02	Math < C; t(126) = −2.81^∗∗	Math < R; F(1,135) = 16.22^∗∗∗a
Subtraction
Pre1	14.01	5.54	25.52	9.99	18.39	6.34	Math < C; t(136) = −4.32^∗∗∗	Math < R; F(1,142) = 33.86^∗∗∗a
Pre2	14.76	6.12	23.27	10.10	17.41	6.62	Math < C; t(127) = −2.36^∗	Math < R; F(1,137) = 15.39^∗∗∗a
Post	16.15	5.64	26.99	10.78	21.97	6.85	Math < C; t(126) = −5.28^∗∗∗	Math < R; F(1,140) = 25.56^∗∗∗a
Follow-up	18.88	6.88	30.99	12.70	24.07	8.40	Math < C; t(126) = −3.84^∗∗∗	Math < R; F(1,135) = 22.45^∗∗∗a
Arithmetic
Pre	8.13	3.59	13.33	4.08	10.71	4.71	Math < C; t(125.12) = −4.59^∗∗∗	Math < R; F(1,139) = 30.29^∗∗∗a
Post	10.50	4.30	13.85	5.12	12.68	3.72	Math < C; t(126) = −3.05^∗∗	Math < R; F(1,140) = 5.27^∗a
Follow-up	11.82	4.03	15.24	4.29	13.98	4.12	Math < C; t(126) = −3.00^∗∗	Math < R; F(1,139) = 30.29^∗∗∗a

Math, math intervention group; R, reading intervention group; C, business-as-usual controls. ^aage and gender as covariate. ^∗p < 0.05, ^∗∗p < 0.01, ^∗∗∗p < 0.001.