Table 1.

Scores on 11 knowledge questions for pre- and postsurveys^a (n = 409)

Question	Subject matter	Correct pre-GCAT (%)	Correct post-GCAT (%)	Increase (%)
1	Microarray experimental error–dye bias	23.1	59.3	36.2
2	Microarrary experimental error–gradient	32.7	43.2	10.5
3	Microarray negative controls	28.9	39.2	10.3
4	Microarray experimental design	33.9	72.1	38.2
5	Gene expression ratios using a graph	5.0	10.8	5.8
6	Gene expression–probability	20.9	21.1	0.2
7	Gene expression–gene clusters	30.0	52.3	22.3
8	Gene expression–regulatory cascade	28.4	43.3	14.9
9	Gene expression–gene circuit graphs	37.9	49.7	11.8
10	Interpreting microarray results	40.0	59.0	19.0
11	Diagnosis with microarrays	54.9	67.4	12.5

^a Performance increased significantly (p < 0.05) on all questions except item 6.