Ovarian Cancer Patient-Centered Decision Aid

Satisfaction with Decision scale (SWD) is a 6-item scale measuring satisfaction with health care decisions, developed and validated in the context of women making decisions about hormone replacement therapy, and subsequently validated in adults with depression making decisions about treatment. The scale has good internal consistency reliability (alpha = 0.85), evidence of construct validity, relevance to designing and assessing patient-centered decision support interventions, and is sensitive to changes in information in trials of decision aids. The scale uses a 1-5 rating (1=strongly disagree; 5 = strongly agree). Scores from these 6 items were linearly transformed to a 0-100 scale. A higher score reflects a higher level of satisfaction with the decision.

The Decision Regret Scale is a 5-item scale which is a reliable and valid indicator of health care decision regret at a given point in time, with excellent psychometric properties. In this study, the question stem will ask "about the decision you made about selecting IP/IV treatment." Total scores were linearly transformed to a 0-100 scale. The lowest possible score, 0, means no regret. The highest possible score, 100, means high regret. This outcome will be measured from T2 - T4, but is not appropriate to ask at the time of the T1 assessment, which is just after the treatment decision has been made, but prior to treatment delivery. Use of this measure will allow us to evaluate whether the PCOA, compared to usual care, helps to reduce regret during and after cancer treatment.

The 9-item Shared Decision Making Questionnaire (SDM-Q-9) was developed and psychometrically tested for use in clinical encounters. It has strong reliability and validity, and use is advocated in studies investigating the effectiveness of interventions aimed at implementing shared decision-making. The question stem indicated the medical decision (IP/IV) with 6 levels of agreement from 'completely disagree to completely agree' (e.g., "My doctor and I selected a treatment option together"). Total scores were linearly transformed to range from 0 to 100, where 0 indicates the lowest possible level of SDM and 100 indicates the highest extent of SDM. SDM was assessed at T1 only, since this was the most proximal in time to when the decision was made.

Satisfaction with Care was measured using the EORTC IN-PATSAT32, which assessed cancer patients' appraisal of doctors and nurses, as well as aspects of care organization and services. The measure also discriminated between cancer patients with different care expectations. Scores from these 32 items were linearly transformed to a 0-100 scale. A higher score reflects a higher level of satisfaction. This measure has excellent internal consistency and convergent validity, although some scales are highly correlated. Test-retest reliability is acceptable.

While the EORTC IN-PATSAT32, assessed cancer patients' appraisal of doctors, nurses, and services, the Satisfaction with Cancer Treatment Questionnaire assessed patients' satisfaction specifically with their most recent therapy (i.e. IV or pills). The scale contained 21 items assessing seven domains. Total scores were linearly transformed to a 0-100 scale. A higher score reflects a higher level of satisfaction with their most recent therapy.

This has been validated on adults with many cancer types and treatments.

Usability and acceptability of PCOA data will be gathered only from the intervention arm. The usability and acceptability of the PCOA program will be determined both through objective data gathered as patients use the application, and through subjective data gathered through a short, self-report survey that will appear on the PCOA application at the end of the session.