Table A1.

Measures of sample attrition and selection bias, children aged 10–16 in metropolitan Brazil, PME 1982–99

Sample	Number of observations	Percent of Sample A	Mean child schooling month 1	Percent children working month 1	Mean father’s schooling month 1	Percent fathers working month 1
A. Child present in month 1	277,021	100%	4.36	11.0%	-	-
B. Child and father present in month 1	227,139	82%	4.41	10.4%	5.48	87.5%
C. Child in sample in months 1–13	162,142	59%	4.51	9.9%	-	-
D. Child and father in sample in months 1–13	156,733	57%	4.52	9.8%	5.52	87.8%
Sample conditional on month 1 activity
E. Child in school, child not working, head working in	165,572	60%	4.43	0%	6.03	100%
F. Same as E plus all sample restrictions for regression in	99,184	36%	4.53	0%	6.12	100%