Table 2 Measurements in part 2 of the OnVaCT project
Outcome | Instrument | Source |
|---|---|---|
Baseline measurements | ||
Patient’s health literacy | Set of Brief Screening Questions (SBSQ-D): Dutch version [32, 33] of the 3-item health literacy scale of Chew et al. [30] on 5-point Likert scales. | Questionnaire at T1 |
Sense of hope | Herth Hope Index (HHI) [34, 35]: Items on a 4-point Likert scale on three dimensions: temporality and future, positive readiness and expectancy, and interconnectedness. | Questionnaire at T1 |
Technology acceptance | Measurements from the Technology Acceptance Model (TAM), adapted in the Unified Theory of Acceptance and Use of Technology (UTAUT) [36,37,38]. In total, 15 items on a 7-point Likert scale are included. | Questionnaire at T1, only in post-test |
Satisfaction with the tool | Website Satisfaction Scale [39,40,41,42]: A Dutch version of the Website Satisfaction Scale will be used, consisting of the subscales ‘satisfaction with comprehensibility’ (3 items), ‘satisfaction with attractiveness’ (5 items) and ‘satisfaction with emotional support’ (4 items), all on a 7-point Likert scale. | Questionnaire at T1, only in post-test |
Quality of life | QLQ-C30 version 3.0 [43] of the European Organisation for Research and Treatment of Cancer (EORTC): 28 items on a 4-point Likert scale and 2 items on a 7-point Likert scale. | Questionnaire at T1 |
Primary outcome | ||
Decisional conflict | Decisional Conflict Scale (DCS) [25]: 16 items on a 5-point Likert scale from 0 to 4. The items are summed, divided by 16 and multiplied by 25 to get a total score for decisional conflict on a 0–100 scale. | Questionnaire at T3 |
Secondary outcomes | ||
Extent to which caregivers involve patients in shared decision-making | Adapted Observer OPTIONMCC [44] based on the OPTION5 [45]: in each recorded consultation, 7 behavioural competences for the medical oncologists regarding goal talk (1 item), option talk (2 items), team talk (1 item), decision talk (2 items) and evaluation talk (1 item) will be coded on a 5-point Likert Scale (0 = ‘the behaviour is not observed’ – 4 = ‘the behaviour is observed and executed to a high standard’). Following OPTION5 guidelines, these scores will be transformed to a 0–100 score. | Analysis of recorded consultation |
Discussion of patient preferences and values | All values and preferences discussed during the consultation will be coded by using a codebook that will be developed specifically for this study, distinguishing between the contribution of the patient, relative (s) and caregiver. This codebook will be (partly) based on the values and preferences that are distinguished in part 1 of the OnVaCT-project. | Analysis of recorded consultation |
Duration of the consultation | The length of the consultation will be assessed by measuring the length of the recorded consultation in minutes. | Analysis of recorded consultation |
Actual usage of the tool | To analyse the actual usage of the tool, Google Analytics will be used to log the number of website visits (i.e. the number of times someone visited/used the tool), the time spent on the website (i.e. the accumulated time someone used the tool) and the number and kind of pages viewed. | Tracking data at T1, only in post-test |