Variables used in propensity score models as predictors of treatment.

Variable	Question	Survey years	Values
Health limitations†,Ω	Does health limit (a) the kind or (b) the amount of work R can do?	1979	1=yes, 0=no
Poverty status†,Ω	Family income for the family size is below the federal poverty income guidelines for the prior year.	1979	1=In poverty
Rotter scale score†,Ω (sum of all pairs of questions of the Rotter scale)	What happens to me is my own doing… Sometimes I feel that I don't have enough control over the question my life is taking	1979	1=in control, 2=not in control
	When I make plans, I am almost certain that I can make them work…or it is not always wise to plan too far ahead, because many things turn out to be a matter of good or bad fortune anyhow	1979	1=R's plans work, 2=matter of luck
	In my case, getting what I want has little or nothing to do with luck…many times we might as well decide what to do by flipping a coin	1979	1=luck not factor, 2=flip a coin
	Many times I feel that I have little influence over the things that happen to me…or it is impossible for me to believe that chance or luck plays an important role in my life	1979	1=luck big role, 2=luck no role
AFQT score†,Ω (summed raw scores sections of the Armed Services Vocational Aptitude Battery (ASVAB) test Race †,Ω	The AFQT assesses verbal, math, and reading skills (NLSY79 User's Guide).	1980	Continuous scale from 1-99
	In what country were you born?	1979	1=Non-Hispanic Black; 0=Non-Hispanic White; 1=Hispanic; 0=Non-Hispanic White.
Nativity†,Ω		1979	0=US native; 1 = Foreign born
Maternal Education†,Ω	What is the highest grade or year of regular school that your mother ever completed?	1979	Continuous scale from 0 (none) to 20 (eighth year college or more)
Marital Status of parents†,Ω	Please take a look at this card and tell me with whom you (are/were) living (when you were 14 years old).	1979	1=lives with biological mother and father; 0=some other arrangement
Age at first birthΩ	Calculated using mother's and first child's birthdays.	1979-2008	Rounded down to nearest integer.
Sex of first childΩ	NLS-created variable from “Fertility and Relationship Histories” files	1979-2008	1=male, 0=female
Gender role orientation†	1) A woman's place is in the home, not the office or shop.2) A wife with a family has no time for outside employment.3) A working wife feels more useful than one who doesn't hold a job.*4) Employment of wives leads to more juvenile delinquency.5) Employment of both parents is necessary to keep up with the high cost of living.*6) It is much better if the man is the achiever outside the home and the woman takes care of the home and family.7) Men should share the work around the house with women.*8) Women are much happier if they stay home and take care of children.	1979	Scores range from 1-4, where 1=strongly disagree, and 4=strongly agree (* indicates measures were reverse coded). Measures were summed, with higher values indicating more traditional attitudes. Cronbach's Alpha = 0.68.
Expectations†	Do you expect to be in school 5 years from now?	1979	1=yes, 0=no
	Altogether, how many (more) children do you expect to have?	1979	Continuous scale from 0 (no children) to 10 children, recoded so that 1=no children, and 0=all others.
	What is the highest grade or year of regular school, that is, elementary school, high school, college, or graduate school that you would like to complete?	1979	Scale ranges from 1=1st grade to 18=6th+ year college, scale is recoded so that 1=4th year college or more, and 0=all others.
	What would you like to be doing when you are 35 years old?	1979	1=Marriage/Family, 0=Present job, some occupation, or other.
Cohabitation Status (at birth of child,Ω	Single mother cohabits with biological father at birth of child	All	1=yes, 0=no
	Single mother cohabits with someone other than biological father at birth	All	1=yes, 0=no

^†Variable used in propensity score matching analysis in Table 4;

^ΩVariable used in propensity score matching analysis in Table 6.