Table 2

Testing post-pre difference of approaches

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)


* 7 Point scale where 3 = strongly like, 0 = neutral, & 3 = strongly dislike

** Bonferroni correction: Alpha = 0.017 (0.05/3)

*** df: Degree of freedom;

Willison et al. BMC Medical Ethics 2008 9:18   doi:10.1186/1472-6939-9-18

Open Data