Table 1.

Descriptive Statistics of the Study Variables

Study 1 WRRMP
Variables	M	SD	Skewness	Kurtosis	Min	Max	N
SES risks	.09	.16	2.12	5.17	.00	1.00	419*
Effortful control	5.28	.61	−.22	−.07	3.22	6.75	429
Negative affect	3.86	.67	−.05	.24	1.48	5.84	429
Surgency	4.48	.74	−.12	.09	2.09	6.64	429
Reading1	422.80	29.72	.39	−.51	340.00	502.33	618
Reading2	461.62	26.21	−.65	−.04	390.00	508.67	551
Reading3	483.65	20.75	−1.03	1.61	395.50	528.00	600
Reading4	500.25	15.09	−.87	1.54	434.33	534.33	576
Reading5	506.87	13.80	−.63	.86	450.00	544.50	527
Reading6	512.57	12.82	−.72	1.03	462.00	544.33	524
Math4	503.61	12.49	−.27	.05	460.50	544.00	567
Math5	511.30	12.59	−.59	1.96	444.00	555.00	517
Math6	517.48	13.34	.11	.92	473.67	566.00	512
Study 2 SECCYD
SES risks	.22	.29	1.22	.56	.00	1.00	1323
Effortful control	4.69	.71	−.33	−.06	2.33	6.54	1054
Negative affect	4.28	.62	−.21	.01	2.10	6.26	1001
Surgency	4.81	.60	.01	.33	2.46	6.75	1041
Reading 1st grade	468.16	15.50	−.12	.27	408.50	511.50	1026
Reading 3rd grade	495.41	13.50	−.95	2.88	403.50	529.50	1016
Reading 5th grade	507.99	13.33	−.97	4.01	419.00	544.00	993
Math 1st grade	470.05	15.54	−.04	−.07	408.00	516.00	1023
Math 3rd grade	497.33	13.19	−1.54	5.59	408.00	528.00	1013
Math 5th grade	509.82	12.85	−1.30	5.39	424.00	547.00	993

Note: M = mean, SD = standard deviation, Min = minimum value, Max = maximum value, N = number of individuals.

^*= number of families.