Independent Variables
	b	SE	β
Constant	23.85	1.40
BUILD Scholar (ref.: control group)	1.29	0.43	0.05*
Pre-test: Science Identity	0.41	0.02	0.45*
Race: Black	0.53	0.55	0.04
Race: Asian	1.54	0.52	0.15*
Race: Native American	−3.65	1.74	−0.20
Race: Multiracial	0.37	0.52	0.03
Race: Latino	0.89	0.59	0.07
Race: Other	0.55	1.00	0.03
Race: Unknown	−0.68	2.38	−0.04
Race: White	0.44	0.49	0.04
Gender: Women (ref.: men)	−0.48	0.28	−0.03
First-Generation Student (y/n)	0.07	0.31	0.01
Site: A (ref.: site D)	0.49	0.50	0.02
Site: B (ref.: site D)	−0.25	0.33	−0.02
Site: C (ref.: site D)	0.73	0.49	0.04
Cohort 2 (ref.: cohort 1)	−0.55	0.38	−0.03
Cohort 3 (ref.: cohort 1)	0.33	0.44	0.02
Cohort 4 (ref.: cohort 1)	−1.18	0.32	−0.08*
Major: Natural sciences (ref.: non-science major)	2.75	0.43	0.15*
Major: Social sciences (ref.: non-science major)	1.56	0.59	0.06*
Financial concerns	−0.23	0.20	−0.02
Pell Recipient (ref.: did not receive Pell grant)	0.19	0.23	−0.02
Biomedical science research career: Definitely no (ref.: Uncertain)	−0.44	0.50	−0.02
Biomedical science research career: Probably no (ref.: Uncertain)	−0.77	0.43	−0.04
Biomedical science research career: Probably yes (ref.: Uncertain)	0.34	0.38	0.02
Biomedical science research career: Definitely yes (ref.: Uncertain)	0.65	0.39	0.04
High school GPA	0.21	0.11	0.04
Science self-efficacy from TFS	0.06	0.01	0.08*
Aspiration: Master’s degree (ref: bachelor’s degree aspiration)	0.11	0.42	0.01
Aspiration: Medical doctorate (ref: bachelor’s degree aspiration)	1.97	0.45	0.12*
Aspiration: Ph.D. or other Professional Doctorate (ref: bachelor’s degree aspiration)	1.45	0.44	0.09*
Aspiration: Missing (ref: bachelor’s degree aspiration)	0.67	1.27	0.01
Summer training for mentors and mentees (y/n)	0.69	0.40	0.03
Conducted hands-on research (y/n)	0.80	0.34	0.04
Conducted hands-on research (missing)	1.23	0.57	0.04
Had at least one mentor during first year (y/n)	1.55	0.28	0.10*
Had a least one mentor during first year (missing)	−0.34	0.62	−0.01*

^*indicates p < 0.01