Table 1.

Descriptive statistics for academic achievement variables.

Variables	Mean	SD	Median	Range
Letter-word identification (reading)
Grade equivalent	1.4	1.1	1.0	<0.0–5.4
Age equivalent	79.7	14.6	76	38–129
W score	401.5	46.2	388	305–511
Applied problems (math)
Grade equivalent	1.5	1.2	1.3	<0.0–4.7
Age equivalent	80.1	15.4	78	55–122
W score	446.7	23.8	444	405–504

Note: Age equivalent score is in months.