Table 1.

Descriptive statistics of teacher and classroom characteristics at baseline

	Full sample	Treatment group	Control group
	n = 90	n = 48	n = 42
Teacher characteristics
Age	39.77 (12.03)	39.00 (12.23)	40.59 (11.91)
African American	0.71 (0.46)	0.67 (0.48)	0.76 (0.43)
Immigrant	0.16 (0.37)	0.23 (0.42)	0.08 (0.27)+
Head teacher	0.34 (0.48)	0.33 (0.48)	0.36 (0.48)
Bachelor or higher degree	0.27 (0.45)	0.30 (0.46)	0.25 (0.44)
≤ 3 years of preschool teaching	0.30 (0.46)	0.36 (0.49)	0.23 (0.42)
Married	0.37 (0.49)	0.36 (0.49)	0.38 (0.49)
Living with ≥ 4 people	0.45 (0.50)	0.42 (0.50)	0.49 (0.51)
Household primary income earner	0.64 (0.48)	0.63 (0.49)	0.65 (0.48)
Pretreatment scores
Job control	3.32 (0.71)	3.42 (0.73)	3.21 (0.69)
Job resources	3.91 (0.70)	4.05 (0.69)	3.78 (0.70)+
Job demands	2.73 (0.69)	2.89 (0.71)	2.58 (0.63)*
Confidence	-1.82 (0.80)	-1.99 (0.83)	-1.65 (0.75)+
Classroom characteristics	n = 35	n = 18	n = 17
Positive climate	5.25 (1.00)	4.96 (1.02)	5.56 (0.90)+
Teacher behavior management	4.86 (1.07)	4.56 (1.11)	5.18 (0.96)+
Class size	16.03 (2.92)	16.06 (3.08)	16.00 (2.83)
Number of adults in class	2.36 (0.69)	2.41 (0.78)	2.31 (0.59)
Percentage of boys	46.35 (10.58)	50.32 (10.46)	42.15 (9.24)*
Percentage of African American	67.14 (39.04)	67.23 (37.58)	67.05 (41.69)
Children’s average poverty risks	1.08 (0.38)	1.13 (0.42)	1.03 (0.33)
Children’s average BPI	6.58 (3.22)	6.93 (2.93)	6.21 (3.56)

Notes: means with standard deviations in parentheses;

^*p < 0.05,

⁺p < 0.10 for two-tailed t-statistics testing mean differences between control and treatment groups.