. Author manuscript; available in PMC: 2022 Sep 16.

Published in final edited form as: J Health Commun. 2019 Apr 29;24(5):503–511. doi: 10.1080/10810730.2019.1609139

Table 1.

Analysis approach for testing differences in regression coefficients using z-tests

Regression Model	Outcome	Ad Exposure Frequency Comparison	Coefficient Comparison Using Z-Test
Model 1a	Risk recall	1 vs. 2	Model 1a vs. Model 1b
Model 1b	Benefit recall	1 vs. 2	Model 1a vs. Model 1b

Model 2a	Risk recall	2 vs. 4	Model 2a vs. Model 2b
Model 2b	Benefit recall	2 vs. 4	Model 2a vs. Model 2b

Model 3a	Risk recognition	1 vs. 2	Model 3a vs. Model 3b
Model 3b	Benefit recognition	1 vs. 2	Model 3a vs. Model 3b

Model 4a	Risk recognition	2 vs. 4	Model 4a vs. Model 4b
Model 4b	Benefit recognition	2 vs. 4	Model 4a vs. Model 4b