Table 4.

Nearest-neighbour propensity score matching: common support and bias reduction*

	Matched BFP			Matched Non-BFP			Bias	Bias	Bias reduction
	On support		Off support	On support		Off support	Before matching	After matching
	N		N	N		N	Mean	Mean	%
Externalising problems:
SDQ-Externalising problems†	849	24		1190	0		31.2	5.1	76.1
SDQ-Less prosocial‡	849	24		1190	0		31.2	5.1	76.1
Violent behaviour§	819	33		1155	0		31.3	4.4	80.9
Socio-emotional competencies:
Social aptitudes	847	21		1184	0		31.1	6.1	63.3
Positive attributes	850	22		1190	0		31.2	4.0	77.2
Locus of control‖	806	21		1132	0		31.1	5.9	72.5

BFP – Bolsa Família Programme, N – number of observations, SDQ – Strengths and Difficulties Questionnaire

*Matched by sex, ethnicity, maternal schooling, household wealth score, maternal age at childbirth, maternal depressive symptoms, and number of live children at birth.

†Conduct plus hyperactivity items.

‡Prosocial subscale is reverse scored.

§Any 12-month physical aggression that caused injuries, N = 2007 adolescent report.

‖N = 1959 adolescent report.