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Table 2 Testing post-pre difference of approaches

From: Alternatives to project-specific consent for access to personal information for health research: Insights from a public dialogue

Approach Mean (SD) Pre* Post* Post minus Pre P-value for difference (paired t-test)**
1. Consent for each use Mean (SD) 0.34 (1.95) 0.14 (2.07) -0.21 (2.02) 0.315 (df = 95***)
2. Assumed consent Mean (SD) 0.44 (1.99) 0.18 (2.10) -0.29 (1.82) 0.122 (df = 96)
3. Broad Consent Mean (SD) 1.55 (1.64) 1.21 (1.55) -0.32 (1.54) 0.048 (df = 94)
  1. * 7 Point scale where 3 = strongly like, 0 = neutral, & 3 = strongly dislike
  2. ** Bonferroni correction: Alpha = 0.017 (0.05/3)
  3. *** df: Degree of freedom;