t0-physician | t0-patient | t1-patient | t2-patient | t3-patient | t1-physician | t2-physician | |
---|---|---|---|---|---|---|---|
Secondary outcomes (survey data) | |||||||
Self-reported self-efficacy (patient) | |||||||
Perceived Efficacy in Patient-Physician Interactions (PEPPI)-Questionnaire [48] | X | X | |||||
One Item of Perceived Efficacy in Patient-Physician Interactions (PEPPI)-Questionnaire [48] | X | ||||||
Health Literacy (patient) | |||||||
X | X | ||||||
Health literacy global questions | X | ||||||
Pain intensity (patient) | |||||||
Visual analog scale (VAS) [50] | X | X | |||||
Accordance of provided and needed information (physician) | |||||||
Domains “Adequacy of information” and “Usability of information” of the Decision Attitude Scalea,b [51] | X | ||||||
Self-developed item whether content fits expectations | X | ||||||
Usability (physician) | |||||||
System Usability Scale (SUS)a,b [52] | X | ||||||
Self-developed items on usability | X | ||||||
Use of portal (physician) | |||||||
Self-developed items on actual use of portalb | X | X | |||||
Secondary outcomes (routine data) | |||||||
Patient’s days of sick leave | X | ||||||
Patient’s back pain related costs for the health care system | X | ||||||
Control variables (survey data) | |||||||
Patient | |||||||
Back Belief Questionnaire [53] | X | ||||||
Sociodemographic data | X | X | X | ||||
Internet Use | X | ||||||
Medical data | X | X | |||||
Physician | |||||||
Sociodemographic data | X | ||||||
Structural features of the practice (kind of practice, patients per quarter, number of employees, location and region) | X | ||||||
Control variable (web analytics) | |||||||
Portal use by patients | Throughout the intervention phase (after consultation) | ||||||
Portal use by physicians | Throughout the intervention phase |