Table 1.

Demographic and nonverbal intelligence data for the Montessori—(M) and traditionally—(T) schooled children.

	Group		X2 or t test	p values	Cohen’s d
	M	T
N (girls)	36 (16)	31 (16)	0.34	0.58
Age [years]	9.1 (2.3)	8.6 (2.0)	1.03	0.31	0.25
min, max	5.5–14.6	5.2–12.3
Nonverbal Intelligence [score]	33.2 (3.45)	32.2 (3.59)	2.28	0.30	0.81
SES [score]	7.03 (1.41)	6.83 (1.46)	0.54	0.59	0.14

Mean and SD in parentheses.