Table 7.

Results of stepwise multiple regression analyses: science identity (sophomore year; criterion variable)

Predictor variables	Model 1: step R2 change	Model 2: final equation Beta	Model 2: final step R2 change	Model 3: final equation beta	Model 3: final step R2 change
Step 1: covariates	0.198**	—		—	—
Step 2: sense of community (Summer Bridge)	—	0.24**	0.056**	0.12	—
Step 3: perceived program benefit (freshman year)	—			0.31**	0.072**

Steps 2 and 3 establish support for full mediation by perceived program benefit on the relation between sense of community and science identity.

**p < 0.01 (two-tailed).