Understanding Consumers Quality Evaluation of Online Health Information: Using a Mixed-Method Approach
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1 Understanding Consumers Quality Evaluation of Online Health Information: Using a Mixed-Method Approach Yan Zhang Jacek Gwizdka Information experience Lab, Co-director yanz@ischool.utexas.edu jgwizdka@acm.org School of Information, University of Texas at Austin
2 The Team UT Austin, School of Information Yan Zhang, Assistant Professor and Jacek Gwizdka, Assistant Professor University of Porto, Dept. of Informatics Engineering, Faculty of Engineering Carla Teixeira Lopes, Assistant Professor Jacek Gwizdka jsg.tel 2
3 Yan Zhang: Prior Work on Health Information Seeking Consumer health information seeking: context and individual differences Zhang, Y. (2013). The effects of preference for information on consumers online health information search behavior. Journal of Medical Internet Research, 15(11), e234. Available at: /11/e234/ Zhang, Y. (2013). Toward a layered model of context for health information searching: An analysis of consumer-generated questions. Journal of the American Society for Information Science & Technology, 64(6), Zhang, Y., Broussard, R., Ke, W., & Gong, X. (2014). The evaluation of a Scatter/Gather interface for supporting distinct health information search tasks. Journal of the Association for Information Science & Technology, 65(5), Zhang, Y. (2014). Searching for specific health-related information in MedlinePlus: Behavioral patterns and user experience. Journal of the Association for Information Science & Technology, 65(1), Quality of online health information Zhang, Y. (2014). Beyond quality and accessibility: Source selection in consumer health information searching. Journal of the Association for Information Science & Technology, 65(5), Zhang, Y., Sun, Y., and Xie, B. (In Press). Quality of health information for consumers on the Web: A systematic review of indicators, criteria, tools, and evaluation results. Journal of the Association for Information Science and Technology. Jacek Gwizdka jsg.tel 3
4 Jacek Gwizdka: Prior Work on Human-Information Interaction Information evaluation relevance cognitive and multidimensional perspective Perceived information relevance and eye-movement patterns Gwizdka, J. (2014). Characterizing Relevance with Eye-tracking Measures. Proceedings of Information Interaction in Context (IIiX 2014). Regensburg, Germany. ACM Press Zhang, Y., Zhang, J., Lease, M., & Gwizdka, J. (2014). Multidimensional Relevance Modeling via Psychometrics and Crowdsourcing. In Proceedings of the 37th International ACM SIGIR Conference on Research and Development in Information Retrieval (pp ). New York, NY, USA: ACM Press. Gwizdka, J. (2014). News Stories Relevance Effects on Eye-Movements. In Proceedings of the Symposium on Eye Tracking Research and Applications (ETRA 2014). March 26-28, , Safety Harbor, FL. ACM Press. Gwizdka, J. (2014). Tracking Information Relevance. Paper presented at the Gmunden Retreat on NeuroIS Gmunden, Austria. Users domain knowledge Inferring differences in domain knowledge from eye tracking data Cole, M., Gwizdka, J., Liu, C., Belkin, NJ, Zhang, Z. (2013). Inferring user knowledge level from eye movement patterns. Information Processing and Management. DOI: /j.ipm Jacek Gwizdka jsg.tel 4
5 Motivation for The Project Jacek Gwizdka jsg.tel 5
6 Consumer health information searching on the web 72% of web users in the U.S. and 71% in Europe have looked online for health information (Pew Internet & American Life, 2013; WHO ehealth survey, 2007) Ø Track diets, healthy lifestyles, weight loss Ø Prevention Ø Symptoms, treatments, and self-diagnoses
7 Critical role of information for consumer health 60% of respondents reported that online information affected a treatment decision (Pew Internet & American Life, 2012) Improve: Attitudes towards diseases and coping, sense of control, decision making, better comply with treatment, and better management of disease (Gray et al., 2009; Tan, Mello, & Hornik, 2012; Moldovan-Johnson et al., 2014) Information seeking is significantly associated with preventative behaviors, such as healthy eating (McKinley & Wright, 2014) 7
8 All the positive outcomes hinges on Quality 8
9 However Zhang, Sun, & Xie, B. (In Press) 165 articles in which health care professionals evaluated the quality of consumer-oriented online health information on a wide range of medical subjects (more info: quality indicators on separate slides) 9
10 Consumers evaluation of online health information quality -- Which one is right? Consumers evaluate the quality of online health information, they use: Ø Source indicators: Author, affiliation, and design (Eysenbach & Kohler, 2002; Sillence, et al., 2004; Zhang, 2014) Ø Message indicators: Whether it sounds logic; cross validation (Broussard & Zhang, 2013; Sillence, et al., 2004) Consumers do not evaluate the quality of online health information: Ø Do not use quality indicators (Eysenbach & Kohler, 2002 ; Williams, et al., 2002) Ø Having difficulties in evaluating the quality (Arora & Hesse, 2008; Feufel, 2012; Eysenbach & Kohler, 2002 ; Williams, et al., 2002) 10
11 So, it is worthwhile to investigate: Do consumers indeed evaluate the quality of online health information? If so, how do they evaluate? Which quality indicators do they use? Do individual differences, such as age and ehealth literacy, have an impact on the evaluation? Jacek Gwizdka jsg.tel 11
12 Hypotheses Hypothesis 1. Older adults are a) less likely to evaluate the quality of health information online, and b) if they do, they make use of fewer interface and content elements, than young adults. Hypothesis 2. Those with high ehealth literacy are: a) more likely to evaluate the quality of health information online than those with low ehealth literacy, and b) able to make more effective use of interface and content elements in the evaluation Jacek Gwizdka jsg.tel 12
13 Plan of work 1. Preparations for experiment experiment design system design and development instrumenting health-related web sites for data capture 2. Lab experiment with human participants 3. Data analysis data cleaning and processing data analysis qualitative and quantitative 4. Writing up Jacek Gwizdka jsg.tel 13
14 Motivation for Method Previous studies most often relied on self-reported user accounts hence were potentially biased To address the issues and gaps in previous studies we will use mixed-method approach combining objective data from eye-movements with subjective data from interviews and survey instruments we will use retrospective think aloud protocol (RTAP) Jacek Gwizdka jsg.tel 14
15 Lab Experiment Design Mixed-2x2x2 design (within- and between-subjects) 3 independent variables, at 2-levels each: 1. health information search task type For example, looking for treatment and looking for self-diagnosis withinsubjects variable; 2. participant age (younger and older) between-subjects variable; and 3. participant level of ehealth literacy (low and high) between-subjects variable Health literacy will be measured using eheals (8-item scale à next slide) Participant s self-reported familiarity with and interest in the assigned tasks will also be recorded. Jacek Gwizdka jsg.tel 15
16 eheals: ehealth Literacy Scale 1. How useful do you feel the Internet is in helping you in making decisions about your health? 2. How important is it for you to be able to access health resources on the Internet? 3. I know what health resources are available on the Internet 4. I know where to find helpful health resources on the Internet 5. I know how to find helpful health resources on the Internet 6. I know how to use the Internet to answer my questions about health 7. I know how to use the health information I find on the Internet to help me 8. I have the skills I need to evaluate the health resources I find on the Internet 9. I can tell high quality health resources from low quality health resources on the Internet 10. I feel confident in using information from the Internet to make health decisions Norman, C. D. and H. A. Skinner (2006). "eheals: The ehealth Literacy Scale." Journal of Medical Internet Research 8(4). Jacek Gwizdka jsg.tel 16
17 Lab Experiment Design continued The dependent variables will include behavioral measures (e.g., time spent on different types of web pages, interaction with different elements of web pages (clicks and eye gaze), transition between web pages, and transitions within web pages, and eye movements measures patterns of eye movement fixation duration pupil dilation Jacek Gwizdka jsg.tel 17
18 A Digression - Eye movements and eye-tracking Jacek Gwizdka jsg.tel 18
19 Human Vision Fundamentals Eye-mind link hypothesis: attention is where eyes are focused (Just & Carpenter, 1980; 1987) Jacek Gwizdka 19
20 Eye Movement and Visual Acuity Foveal, Parafoveal and Peripheral areas Figure source: Tobii website Jacek Gwizdka 20
21 Visual Acuity and Reading 2 o (70px) foveal region sharp image parafoveal region 2 o (70px) foveal region parafoveal region Jacek Gwizdka 21
22 Modern Eye-tracking Equipment Current eye-trackers are computerized and easy to use infrared light sources and cameras (low-accuracy possible using web cams) use corneal light reflection stationary ( remote ) and mobile (wearable) Example Tobii eye- trackers Jacek Gwizdka 22
23 Pupil Dilation Pupils dilate in reaction to light and as a result of increased mental effort or arousal Eye-trackers measure pupil dilation Jacek Gwizdka 23
24 Example Web Page 24
25 Eye Movement Patterns on a Web Page Variety of patterns Dong et al
26 Eye-Movements Patterns Differ - Relevance 1. Irrelevant doc Text relevance affects: How the text is read Cognitive load 2. Topical doc Eye-movement à relevance reading patterns, eye-movement measures, pupil dilation: 65%-74% classification accuracy of predicting binary relevance 3. Relevant doc (Gwizdka, J., 2014) Jacek Gwizdka 26
27 Preliminary Analysis Framework Layered model of information evaluation usability level à page elements do people see the elements that they should consider in evaluating information evidence: eye fixations on page elements + interview readability level à text/images inside page elements do people read and understand different elements that affect information evaluation evidence: eye movement patterns within elements + interview cognitive level à relations between elements do people know how to relate and make sense of page elements in evaluating information evidence: eye movement patterns between elements + interview WebMD test blah blah WebMD test blah blah test blah blah test blah blah How does age, ehealth literacy affect the above? Jacek Gwizdka jsg.tel 27
28 Expected Project Outcomes Learn if consumers actually evaluate quality of online health information If they do evaluate it, how they do it Learn about differences in online health information evaluation between younger and older adults between people low and high on ehealth literacy Inform design of online health sites to promote information evaluation Tailor training materials to users in different age groups and with different levels of ehealth literacy Jacek Gwizdka jsg.tel 28
29 Thank you! Questions? Dr. Yan Zhang Dr. Jacek Gwizdka IX Lab Jacek Gwizdka jsg.tel 29
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