TABLE 1B.

Means, SDs, and/or percentages for demographic variables for the Montessori and conventional samples.

	Montessori	Conventional
Mean Age (SD)	31.95 (9.6)	41.0 (14.1)
Gender     Male	23.3	19.0
Female	76.7	81.0
Race/Ethnicity  White	83.8	82.4
Black or African American	1.8	4.6
American Indian or Alaska Native	0.2	0.7
Hispanic or Latino	3.7	3.7
Asian	4.1	4.9
Native Hawaiian or Pacific Islander	0.5	0.0
Multiple	5.4	2.6
Other	0.2	1.0
Preferred not to answer	0.2	0.1
Maternal education
Less than high school diploma	1.4	7.0
High school diploma	5.0	24.0
Some college or vocational training	9.1	16.1
2-year college degree	4.4	9.1
4-year college degree	35.1	26.5
Post-college degree	44.8	17.4
Social class during childhood
Lower/working	5.2	16.5
Lower middle	10.8	19.4
Middle	40.2	38.6
Upper middle	38.8	22.7
Upper	5.0	2.8
Proportion private schooling	0.67	0.37
Years in Montessori	8.03 (3.7)	0.02 (0.13)
Years in conventional	7.22 (3.8)	14.0 (1.34)

Standard deviations (SDs) are in italics.