Table 1.

Comparison of all students to consenting students on mean exam scores^a

Year	All students	Students consenting for written work	p	Students consenting for audio recording	p
1	76 (1.3)	NA	NA	78 (1.6)	0.227
2	76 (0.9)	78 (0.9)	0.130	80 (1.1)	0.030

^aNumbers in parentheses represent SE. Student’s t tests were used to generate p values.