Publicly available, interactive Option GridTM patient decision aid shifts user preferences about the PSA test, increases knowledge and reduces decisional conflict
Date Submitted: May 21, 2018
Open Peer Review Period: May 21, 2018 - Jul 16, 2018
Background: Randomized trials of web-based decision aids for prostate specific antigen (PSA) testing indicate that these interventions improve knowledge and reduce decisional conflict. However, we do not know about these tools’ impact on people who spontaneously use a PSA testing patient decision aid on the internet. Objective: 1) Determine the impact of publicly available web-based PSA Option Grid patient decision aids on preference shift, knowledge, and decisional conflict; 2) identify which frequently asked questions (FAQs) are associated with preference shift; 3) explore the possible relationships between these outcomes. Methods: Data were collected between January 1, 2016 and December 30, 2017. Users who accessed the online, interactive PSA Option Grid were provided with three options – have a PSA test, no PSA test, unsure. Users first declared their initial preference, completed five knowledge questions, and a four-item (yes or no) validated decisional conflict scale (SURE). Next, users were presented with ten FAQs and asked to identify their preference for each question based on the information provided. At the end, users declared their final preference and completed the same knowledge and decisional conflict questions. Paired sample t-tests were employed to compare before-and-after knowledge and decisional conflict scores. A multinomial regression analysis was conducted to determine which FAQs were associated with a shift in screening preference. Results: Of the 467 people who accessed the PSA Option Grid, 186 (40%) completed the interactive journey and associated surveys. After excluding 22 female users, we analyzed 164 responses. At completion, users shifted their preference to ‘not having the PSA test’ (26% vs 71%; P <.01), had higher levels of knowledge (68% vs 89%, P < .01), and lower decisional conflict (57% vs 11%, P < .01). Three FAQs were associated with preference shift: What does the test involve? If my PSA level is high, what are the chances that I have prostate cancer? What are the risks? No relationships were present between knowledge, decisional conflict, and preference shift. Conclusions: Unprompted use of the interactive PSA Option Grid leads to preference shift, increased knowledge, and reduced decisional conflict which confirms the ability of these tools to influence decision-making, even when used outside clinical encounters.