Table 3:

Results of T-Tests

Outcome	Comparison Pre and Post for CDC Poster (N=466)	Comparison Pre and Post for Patient- Centered Poster (N=470)	Comparison Between Posters
Primary Outcome: Mean Change in Contraceptive Knowledge Score (99% Confidence Interval) Range: −25 to 25	0.90** (0.66–1.13)	1.6** (1.31–1.90)	Patient-centered performed better**
Absolute Percentage Point Change	3.6	6.4
Primary Outcome: Mean Accuracy of Perceived Pregnancy Risk Score (99% Confidence Interval) Range: −1 to 1	0 (−0.02–0.02)	0.013 (−0.01–0.04)	Fail to reject the null hypothesis
Absolute Percentage Point Change	0	1.3
Primary Outcome: Mean Change in Most Likely Method Score (99% Confidence Interval) Range: −3 to 3	0.09** (0.02–0.17)	0.09* (0.01–0.17)	Fail to reject the null hypothesis
Absolute Percentage Point Change	3	3
Positive Control: Mean Change in Questions Addressed by Posters (99% Confidence Interval) Range: −11 to 11	0.64** (0.50–0.78)	1.31** (1.11–1.51)	Patient-centered performed better**
Absolute Percentage Point Change	5.8	11.9
Change in % Correct	68.5% to 74.4%	68.6% to 80.5%
Negative Control: Mean Change in Questions Not Addressed by Either Poster (99% Confidence Interval) Range: −14 to 14	0.26** (0.10–0.42)	0.29** (0.12–0.47)	Fail to reject the null hypothesis
Absolute Percentage Point Change	1.8	2.1
Change in % Correct	64.9% to 66.6%	65.5% to 67.6%

^*p<0.01,

^**p<0.001 to account for multiple comparisons