Figure A1.

Attrition from the WLS Sample across Waves

Note: 1975 respondents include those who participated in the 1975 telephone survey; 1993 respondents include those who participated in the 1993 telephone and mail surveys; and 2004 respondents include those who participated in the 2004 telephone and mail surveys. At each wave, non-respondents include individuals who were not located and individuals who were located but who were unwilling to participate. Of the 5,300 respondents in 2004, 10 were dropped from the analyses because they were not in the modal birth cohort.