Understanding and Discouraging Overuse of Potentially Harmful Screening Tests

Eksperimentel: Quantitative

In the quantitative arm, we will present harms as absolute risks in the Quantitative Information Sheet. Compared with other risk formats, absolute risks have been shown to improve understanding relative to other common risk formats.

Adfærdsmæssigt: Quantitative Information Sheet

Patients will read an information sheet about one of the three exemplar services in one of four presentations: quantitative, qualitative, narrative, or framed. In the quantitative information sheet, harms will be communicated in absolute risks with accompanying fact box (i.e. box containing key facts and rates). In addition to information about harms, the information sheet will include the following information: a description of the disease to be detected and the screening test, a description of the possible benefits of the service, and a statement encouraging decision. As an adjunct to numerical information in paragraph form, fact boxes engage individuals to process information and improve understanding.

Aktiv komparator: Qualitative

In the qualitative arm, we will describe harms using verbal descriptors (such as rare, uncommon, fairly common, and common) in the Qualitative Information Sheet.

Adfærdsmæssigt: Qualitative Information Sheet

Patients will read an information sheet about one of the three exemplar services in one of four presentations: quantitative, qualitative, narrative, or framed. In the qualitative information sheet, harms will be communicated using verbal descriptors. In addition to information about harms, the information sheet will include the following information: a description of the disease to be detected and screening test, a description of the possible benefits of the service, and a statement encouraging decision.

Eksperimentel: Narrative

In the narrative arm, we will present harms using patient narratives (i.e. descriptions in which patients describe their experience with decision making about potentially harmful screening services)in the Narrative Information Sheet. To address concerns in the literature that characteristics of the narrator independently influence narrative effect, we will present narratives in paper format with a banner of culturally diverse age-appropriate pictures shown at the top.

Adfærdsmæssigt: Narrative Information Sheet

Patients will read an information sheet about one of the three exemplar services in one of four presentations: quantitative, qualitative, narrative, or framed. In the narrative information sheet, harms will be communicated using patient narratives with accompanying fact box. In addition to information about harms, the information sheet will include the following information: a description of the disease to be detected and screening test, a description of the possible benefits of the service, and a statement encouraging decision.

Eksperimentel: Framed

In the framed arm, we will frame not screening with potentially harmful services as beneficial (i.e. use a gain frame). In the Framed Information Sheet, we will highlight the harms that could be avoided by not getting screened.

Adfærdsmæssigt: Framed Information Sheet

Patients will read an information sheet about one of the three exemplar services in one of four presentations: quantitative, qualitative, narrative, or framed. In the framed information sheet, harms will be communicated using a gain frame (as described in the arm section above) with accompanying fact box. In addition to information about harms, the information sheet will include the following information: a description of the disease to be detected and screening test, a description of the possible benefits of the service, and a statement encouraging decision.

Change from Baseline in Intent to Accept Screening Immediately Post-intervention

Following the example of others, we will measure intent to accept screening services with possible or clear net harm with a single item "I plan to get screened for (name of screening test) in the next year." Because the recommended screening intervals for services under study are variable and not all participants will be due for screening in the next year, we will additionally query participants about plans for screening within the recommended screening interval (e.g. osteoporosis screening--5 years; CRC--10 years). Responses will range from "strongly disagree" to strongly agree". All outcomes will be measured before and after participants receive the information sheet. All data will be collected at the one study visit.

Change from Baseline in Perceived Disease Risk Immediately Post-Intervention

Perceived risk or susceptibility of disease will be measured for each disease state under study using one item that reads, "How likely is that you will get (insert prostate cancer, osteoporosis, or colon cancer) in the next 10 years?" Answers will be on a likert scale from "not at all likely" to "very likely."

Change from Baseline in Perceived Disease Severity Immediately Post-Intervention

Perceived Disease Severity will be measured for each disease state under study using the Revised Illness Perceptions Questionnaire for Healthy People. It includes the following four questions: 1) x (insert prostate cancer, osteoporosis, or colon cancer) has serious financial consequences; 2) x strongly affects the way the patient sees himself as a person; 3) x causes difficulties to those close to the patient; 4) x is very serious. Answers will be on a 5-point scale from "strongly disagree" to "strongly agree."

Change from Baseline in Disease Specific Knowledge Immediately Post-Intervention

Two questions central to understanding each exemplar service (i.e. prostate cancer screening, osteoporosis screening, colon cancer screening) were selected to assess specific knowledge. Response options include true, false, or don't know.

Questions for prostate cancer screening are:

1. Some men can live long, normal lives with untreated prostate cancer.
2. Problems with sexual function and urination are common side effects of prostate cancer treatments.

Questions for colon cancer screening are:

1. Most polyps in the bowel never become cancer.
2. Bleeding and perforations are complications of a colonoscopy.

Questions for Osteoporosis screening are:

1. Broken hip bones are uncommon before age 65.
2. Treatments for osteoporosis can sometimes result in bone damage.

Change from Baseline in Disease-Specific Screening Attitudes Immediately Post-Intervention

Six questions will assess participants' attitudes about each screening service under study.

Questions include:

1. Screening for x(insert prostate cancer, colon cancer, osteoporosis) in healthy persons my age is a good idea.
2. There is little harm to screening for x.
3. I owe it to people close to me to get screened for x.
4. I owe it to my doctor to get screened for x.
5. I would regret not being screened for x.
6. I do not feel any special responsibility to get screened for x.

Response options range from "strongly disagree" to "strongly agree".

Change from Baseline in Decisional Balance Immediately Post-Intervention

Decisional balance will be measured by a single item for each screening service under study. Participants will be asked, "Which best describes how you feel right now?" Participants will select one of the following answers: 1) The benefits of X (insert prostate cancer, colon cancer, osteoporosis) screening greatly outweigh the harms; 2) The benefits of X screening somewhat outweigh the harms; 3) The benefits and harms of X screening are about the same; 4) The harms of X screening somewhat outweigh the benefits; and 5) The harms of X screening greatly outweigh the benefits.

Change from Baseline in Values Clarity Immediately Post-Intervention

Values Clarity will be measured with three items for the values subscale of the decisional conflict scale.

Items include:

1. I am clear about which benefits matter most to me;
2. I am clear about which harms and side effects matter most to me;
3. I am clear about which is more important to me (the benefits or the harms);

Response options range from strongly disagree to strongly agree.

Change from Baseline in General Screening Knowledge Immediately Post-Intervention

General screening knowledge will be assessed using 8 items developed by investigators.

Questions include:

1. Screening means detecting disease before someone can see or feel any problem.
2. Some diseases detected by screening won't cause any problems in a person's lifetime.
3. In some cases, screening can lead to treatment that is not necessary.
4. Screening never harms anyone.
5. An abnormal screening test means I have the health condition for sure.
6. A normal screening test means that I have am free of the health condition for sure.
7. Screening can only decrease your chances of getting sick or dying if effective treatments are available.
8. Screening can only decrease your chances of getting sick or dying if you live long enough for treatments to work.

Response options are true, false, or don't know.

Change from Baseline in General Screening Attitudes Immediately Post-Intervention

General Screening Attitudes will be assessed at baseline by 38 questions that were developed by investigators and assessed for content validity by panel of experts. Questions assess the following sub-constructs:

General approach to screening, Value of Screening, Need to Know about Disease, Early Detection/Treatment, Benefits, Harms, Anticipated Regret in Choosing for/against screening, Duty/Responsibility to be screened, Effect on screening on MD/patient relationship.

Response options range from "strongly disagree" to "strongly agree" on a 5-point scale.

At post intervention, a subset of 12 of the 38 questions (1-2 from each subconstruct) will be used to assess changes in general screening attitudes.

Key moderating variables

Multiple variables will be measured to examine whether they moderate the effect of the intervention on the primary outcome intent for screening.

These variables include:

1. self-efficacy for screening (1 question)
2. cues to action (6-questions on sources of health information)
3. perceived ambiguity of recommendations for screening (1 question)
4. personality traits (10-item personality index)
5. optimism (3 question subscale of life orientation test)
6. need for cognition (3 items from need for cognition scale)
7. health numeracy (3 items from Schwarz and Woloshin numeracy score)
8. prior screening status (1 item per service)
9. study site
10. health insurance status