Table 3 Most Recent (2011) Cochrane Collaboration Review of PtDAs [30]: Randomized Controlled Trials that Involved Internet Delivery [72–75]

RCT, n = 226 randomized to view video during appointment at clinic or website at home before clinic visit

For both groups:

- Knowledge scores were similar;

- Ratings of effort required, convenience, and satisfaction were similar.

Viewing the video at the clinic:

- Increased the likelihood of viewing the complete PtDA

RCT, n = 174 men randomized to either informational website or Colorectal Web

Viewing Colorectal Web:

- increased immediate reporting of preferred test, but no difference at 2, 8, or 24 weeks

- increased screening

Clustered RCT, n = 497 randomized to paper PtDA, website PtDA, or no pre-visit education

Viewing either PtDA:

- Increased decisional control

- Increased knowledge scores

- Decreased screening

RCT, n = 611 randomized to web-based didactic PtDA, disease model + time trade-off exercise, both, or public PSA websites

Knowledge scores were:

- Highest for didactic PtDA

- Lowest for public websites Post-PtDA screening preferences differed across groups.