Table 1.

Descriptive statistics for the 29 individual difference variables and the two comprehension measures.

Variables	N	Minimum	Maximum	Mean	Standard Deviation
Decoding & Phono. Awareness
Orthographic Decision (ms)	261	523.207	157.653	762.638	141.630
Phonological Decision (ms)	252	1157.615	8084.414	2659.039	1106.412
Non-word Naming (ms)	243	139.750	6479.044	1053.328	483.228
Phoneme Transposition*	224	0.040	1.000	0..876	0.131
Working-Memory Capacity
Reading Span*	285	0.270	0.930	0.640	0.135
Alphabet Span*	284	0.130	0.970	0.733	0.121
Minus Span*	281	0.100	1.000	0.834	0.136
Visual Number Span*	278	0.000	0.710	0.345	0.073
Suppression/Inhibition
Go-No-Go*	256	0.000	0.700	0.138	0.136
Stroop Interference (ms)	245	−257.809	1052.417	96.981	102.886
Print Exp. & Background Know.
Author Recognition Test*	279	0.000	0.500	0.175	0.104
Reading Questionnaire	330	1.000	5.000	3.580	0.962
Cultural Intelligence*	262	0.120	0.910	0.573	0.138
Scientist Recognition Test*	279	0.000	0.640	0.247	0.109
Vocabulary
Extended Range Vocabulary*	278	−0.090	0.720	0.319	0.148
Advanced Vocabulary*	270	0.000	0.690	0.345	0.143
Nelson-Denny Vocabulary*	283	0.630	0.980	0.866	0.079
General Reasoning
Raven’s Progressive Matrices*	280	0.290	1.000	0.723	0.129
Arithmetic Aptitude Test*	278	0.070	0.990	0.498	0.194
Mathematic Aptitude Test*	261	−0.150	0.960	0.366	0.154
Necessary Arithmetic Ops.*	274	−0.040	0.960	0.516	0.179
Perceptual Speed
Letter Comparison*	274	0.040	0.740	0.191	0.054
Finding As*	274	0.080	0.690	0.312	0.083
Number Comparison*	275	0.100	0.530	0.284	0.063
Pattern Comparison*	262	0.570	1.000	0.962	0.061
Identical Pictures*	260	0.320	1.000	0.707	0.138
Verbal Fluency
Word Beginnings	276	9.000	57.000	26.360	7.916
Word Endings	262	4.000	53.000	31.500	8.128
Word Beginnings & Endings	277	0.000	58.000	19.230	6.944
Comprehension
Nelson-Denny*	263	0.222	1.000	0.788	0.157
Investigator-Generated*	303	0.460	0.922	0.773	0.091

^*reported as proportions