- freely available
Int. J. Environ. Res. Public Health 2014, 11(2), 2003-2013; doi:10.3390/ijerph110202003
Published: 14 February 2014
Abstract: Objective: The purpose of this study was to identify patient preferences for different components of a local diabetes prevention program that would improve reach.A secondary purpose was to determine if patient characteristics were related to program preferences. Methods: Participants were identified through electronic medical records from two family medicine clinics in Virginia. Participants completed a mailed survey addressing demographics, economic status, risk factors for diabetes, and preferences regarding diabetes prevention interventions—delivery mode, program length, and duration. Results: Twenty-nine percent of eligible participants responded (n = 142); 83% of participants were at risk for diabetes and 82% had a household income <$20,000.When presented with the choice between a class-based vs. a technology-based program, 83% preferred a technology-based program. Whites were less likely to choose the technology-based program, with no significant differences based on age, education, income, or gender. Conclusions: Contrary to beliefs that lower income individuals may not use technology-based interventions, lower socioeconomic patients indicated a preference for a technology- and telephone-supported diabetes prevention program over in-person class approaches. Findings provide formative data to support the design of a patient-centered, technology-enhanced diabetes prevention program in a real-world setting, thereby increasing potential participation and reach.
With the ever quickening pace of life in modern societies, individuals are bombarded with information and choices. Additionally, given that human beings seek out pleasure, avoid pain, and are designed to do these things as efficiently as possible , it is imperative that when designing health behavior change interventions that they are as aligned as possible with the preferences of the participants.
This effort is particularly important because the predicted trends in the prevalence of type 2 diabetes (T2DM) pose an enormous public health concern. Approximately 8% of USA adults are currently diagnosed with T2DM with an additional 5% having undiagnosed T2DM. Estimates indicate that by 2050 one in three adults will have T2DM . People at greatest risk for diabetes are those who are overweight and or obese, and have higher than normal blood glucose concentrations, or prediabetes [3,4]. Consequently, these individuals are also at higher risk for cardiovascular disease , and may spend 42% more in annual medical costs than their healthy-weight counterparts .
However, prediabetes and T2DM do not equally affect geographies and populations across the USA . In Virginia, the prevalence is greater among African Americans (13.5%), persons with incomes below $24,000 (15.4%), and those with less than a high school education (15.0%) . This disproportionate burden of diabetes on low socioeconomic status (SES) populations highlights the need to develop cost-effective, wide-reaching diabetes prevention interventions [8,9].
1.1. Generalizability of Diabetes Prevention Programs
The Diabetes Prevention Program (DPP) demonstrated that modest weight loss achieved through diet and exercise was superior to medication in delaying the onset of T2DM . The DPP found that 30 min of physical activity (PA) per day 5 times a week, coupled with a 5%–10% weight loss, resulted in a 58% reduction in the incidence of diabetes .
Subsequently, many researchers have endeavored to translate the DPP into community and clinical settings [11,12,13,14,15,16,17,18,19,20,21,22], yet establishing wide reaching DPP-based interventions in clinical settings remains a challenge, and prevalence rates continue to rise [2,7,23].
Laws and colleagues recently published a review of DPP interventions and concluded that the lack of reporting on external validity dimensions has significantly limited the ability to generalize findings  Furthermore, less than 20% of studies they reviewed described how representative subjects were of the target population, and few reported on key components of reach , such as the associations between SES , morbidity and mortality, prevention and risk factors, and access to proper health care .
1.2. Interactive Technology and Diabetes Prevention Programs
Diabetes prevention programs face several challenges including providing individual participants with the right mixture of intensity, personalization, and flexibility to maximize effect; reaching those at greatest risk; and delivering effective interventions in a sustainable format . Intensive interventions are often expensive and offer little flexibility in the timing and availability of sessions, often resulting in low participation rates among those who could benefit the most . This generally makes program adoption and sustainability within healthcare settings unfeasible. Interactive technologies may offer alternative avenues for the delivery of intervention content to high-risk individuals at convenient times and locations, thus providing possible solutions to DPP challenges [25,26,27,28,29,30,31,32,33]. However, limited data exists on patient-centered approaches to determine the utility of these intervention delivery channels for T2DM prevention. Further, much remains to be learned about what interventions are most appealing to which people.Therefore, the purpose of this study was to identify patient preferences for different components of a proposed local diabetes prevention program that would improve the reach of those at greatest need (low SES and minorities) and be sustainable in local healthcare clinics. A secondary purpose was to determine if the preferences for different program components was related to patient characteristics.
2.1. Study Setting and Population
Patients at risk for developing T2DM were identified through electronic medical records (EMR) of two family medicine clinics serving the Roanoke, VA area. A total of 490 patients were identified using the following ICD-9 diagnoses: prediabetes; glucose intolerance; hyperinsulinism; metabolic syndrome; obesity, morbid; simple Obesity; and/or abnormal weight gain .Identified patients received a letter from their physician with a survey, a $2.00 cash gift, and a return envelope. Approximately 10 days after the mailing, potential participants were called to follow up. This study and procedures were approved by the Carilion Clinic Institutional Review Board.
2.2. Key Outcome Measures
Participants were asked about their willingness to participate in two technology-based programs: (a) an educational DVD followed by automated interactive voice response (IVR) telephone calls, or (b) an in-person small group session followed by IVR calls. Additionally, participants were asked their preference for program length, the frequency and duration of IVR phone calls. The survey also included items from the diabetes risk assessment, which included height, weight, race, ethnicity, family diabetes history, and physical activity behaviors . Analyses were conducted using SPSS statistical software, version 21.0. Simple descriptive and frequency statistics were used to characterize the sample. Chi-square tests were used to evaluate the representativeness of study participants when compared to the surrounding communities served by both clinics and the larger Roanoke population. Logistic regression was used to investigate differences in willingness to participate and program of choice adjusting for standard demographic variables. Finally, chi-square analyses evaluated differences in program length and duration of calls. All significance levels were set at p < 0.05.
One hundred and forty two surveys, 29% of those mailed, were returned. The average age of respondents was 52.7, with 77% female, 43% African-American, and 44% earning $10,000 or less over the last year (Table 1).
|Table 1. Representativeness of participants compared to Roanoke, Virginia.|
(n = 142)
|Census Tract c|
(n = 8,435)
(n = 75,278)
|High Risk for Diabetes (%)a||83.1||n/a||n/a|
|Less than high school graduate||25.2||22.8||11.7***|
|High school graduate or higher no Bachelors’ degree||66.6||64.3||52.2***|
|Bachelors’ degree or higher||8.2||13.0||36.1***|
|Employment Status (%)|
|Full-time or part-time||23.0***||56.0||56.2|
|Other (retired, homemaker)||22.2||26.8||12.9***|
|On Disability (SSI)||37.8***||12.0||7.2|
|Current Tobacco Smokers (%)||26.6||n/a||26.0|
|Annual Income < $20,000 (%)b||67.7||27.7 b||32.6 b|
|Health Insurance Status (%)|
|Access to Telephone (%)||98.6||n/a||n/a|
|Access to DVD Player (%)||90.0||n/a||n/a|
Notes: a  Heikes, K.E.; Eddy, D.M.; Arondekar, B.; Schlessinger, L. Diabetes Risk Calculator: a simple tool for detecting undiagnosed diabetes and pre-diabetes. Diabetes care. 2008; 31:1040–1045; b This value is not on the same threshold. 32.6% of people in the City of Roanoke earn <$25,000; c Combined census tract data from the American Community Survey 2012 ; * < 0.05; ** < 0.01; *** < 0.001.
The average BMI was 39.7and 83% of respondents were at high risk for developing T2DM (i.e., scored ≥ 5 on diabetes risk assessment ). Compared to the greater Roanoke area, study participants were more likely to be female (77.0% vs. 53.3%), black (42.5% vs. 35.0%), and less educated (Bachelors’ degree or higher, 8.1% vs. 36.1%) (Table 1). Furthermore, when compared to the census tract data from the surrounding communities served by both clinics, study participants were more likely to be female and black, while there were no differences in educational level (Table 1).
Eighty-five percent of respondents were willing to participate in either of the two programs.Of those, over 75% indicated preference for weekly calls for the first 2–3 months, then bi-weekly calls for months 4–6, and then monthly calls through 12 months. Chi-Square tests revealed that male respondents (55% vs. 31% 12+months, x2(5) = 14.363, p < 0.01) and those with no health insurance (28% vs. 10% 18+ months, x2(4) = 9.721, p < 0.05) thought the frequency of calls should last longer. There were no differences according to disability status, education, income, or race. Finally, 85% of respondents indicated that call duration should be less than 10 minutes with no significant differences according to sex, insurance status, disability status, education, income, or race.
Additionally, logistic regression results showed that older respondents (OR = 0.91; CI = 0.86–0.97) and those with a higher number of children living in the household (OR = 0.73; CI = 0.56–0.94) were less likely to be interested in participating. There were no differences in interest based on education, income, race, and sex (Table 2).
|Table 2. Logistic regression results for willingness to participate.|
|Number of Children||0.73*||0.09||0.56–0.94|
|Number of People in Household||1.07||0.22||0.71–1.60|
Notes: Wald Chi2(10) = 18.81, p < 0.05; SE = Standard Error; OR = Odds Ratio (the OR here is OR adjusting for the demographic variables shown in the table); CI = Confidence Interval; *p< 0.05, **p <0.01.
Of those that indicated a willingness to participate in either program, 83% preferred the DVD-based over the small group-based version. Logistic regression results demonstrated that whites were significantly less likely to choose the DVD option (OR = 0.23; CI = 0.06–0.81). There were no differences regarding age, education, income, and sex (Table 3).
|Table 3. Logistic regression results for DVD-based program preference.|
Notes: Wald Chi2(5) = 10.22, p < 0.1; SE = Standard Error; OR = Odds Ratio (the OR here is OR adjusting for the demographic variables shown in the table); CI = Confidence Interval; *p < 0.05.
This project sought to determine participants’ preferences for technology-based diabetes prevention programs, and how demographic characteristics may be related to those choices. Current literature and growing epidemiological data has suggested that lower SES individuals are less likely to participate in such programs [38,39]. Technology-based programs nevertheless continue to show promise [26,40,41,42,43,44,45], and our study indicated that a large proportion (85%) of respondents were amenable to technology-based programs to prevent diabetes. More importantly, there were no associations between willingness to participate and SES status (i.e., income, education), suggesting that members of lower SES groups, who suffer from a disproportionate burden associated with T2DM, would be just as likely to participate in technology-based programs. Our study sample included a higher proportion of lower SES individuals indicating that technology-based programs could be a promising avenue for reaching this population.
Most respondents willing to participate in a future program preferred a DVD and IVR-based program. Furthermore, there were no differences in program preference based on SES, which may not be surprising since the vast majority of participants had access to a telephone (98.6%) and a DVD player (90%). A large majority preferred a program lasting at least 12 months, with ongoing follow-up throughout the year. These results suggest patient preferences are consistent with the literature that recommends that programs last at least one year .
The cross-sectional nature of the data does not allow for causal inferences to be made or whether these interventions would be effective. Further, the survey responses indicate a potential interest in future programs, but not actual participation in such programs. Nonetheless, intention to engage in a particular behavior (i.e., participate in a program) has been shown to be predictors of future behavior (i.e., participation) . Additionally, the study included patients from only two clinics; therefore, the results may not generalize to a broader population or even beyond the 29% of patients that responded. Finally, our modest response rate could indicate that only those who are most motivated responded to the mailings. Nevertheless, our findings are of particular note because of the substantial proportion of participants who come from SES categories that are traditionally less likely to participate in surveys and scientific studies .
The findings from this investigation provide formative data to support the development and implementation of a patient-centered, technology-enhanced, diabetes prevention program within areal-world primary health care setting with the goal to increase the reach of such interventions.In particular, the high proportion of lower SES respondents provides important information regarding program characteristics that may be more attractive to them. In fact, potential participants appear to prefer brief follow-up phone calls, using a schedule that thins over the course of the program.The willingness of individuals from lower SES status, who are at high risk for developing T2DM to participate in technology-based programs also indicate that these strategies may be a viable alternative to traditional in-person diabetes prevention efforts. Finally, these interventions could be delivered at a lower cost using fewer clinical resources, thereby reducing the financial burden on both individuals and the health care system.
Research reported in this publication was supported by the National Institute of Diabetes and Digestive and Kidney Diseases of the National Institutes of Health under award number R18DK091811 (Almeida, PI, USA). The content is solely of the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.The work presented in this article has also been supported by Virginia Tech’s Open Access Subvention Fund.
Richard W. Seidel: Contributed to the conception of the study; participated in the study design; participated in the interpretation of results; and led the writing of the manuscript.
Kimberlee A. Pardo: Participated in the study design; contributed to data analyses; and contributed to the manuscript drafts.
Paul A. Estabrooks: Conceptualized the study; participated in its design; participated in the interpretation of results; and contributed to the manuscript drafts.
Wen You: Contributed to the conception of the study; led data analyses; participated in the interpretation of results; participated in the study design; and contributed to the manuscript drafts.
Sarah S. Wall: Participated in the study design; and contributed to the manuscript drafts.
Brenda M. Davy: Contributed to the conception of the study; participated in the study design; and contributed to the manuscript drafts.
Fabio A. Almeida: Conceptualized the study; participated in the study design; contributed to data analyses; participated in the interpretation of results; and contributed to the manuscript drafts.
All authors have read and approved the final manuscript.
Conflicts of Interest
The authors declare no conflict of interest.
- Lisle, D.J.; Goldhamer, A. The Pleasure Trap: Mastering the Hidden Force that Undermines Health and Happiness; Healthy Living Publications: Summertown, TN, USA, 2003; p. 240.
- Chronic Disease Prevention and Health Promotion: Obesity. Available online: http://www.cdc.gov/chronicdisease/resources/publications/AAG/obesity.htm (accessed on 10 January 2014).
- Boyle, J.P.; Honeycutt, A.A.; Narayan, K.M.; Hoerger, T.J.; Geiss, L.S.; Chen, H.; Thompson, T.J. Projection of diabetes burden through 2050: Impact of changing demography and disease prevalence in the USA. Diabetes Care 2001, 24, 1936–1940, doi:10.2337/diacare.24.11.1936. 11679460
- National Diabetes Fact Sheet: National Estimates and General Information on Diabetes and Prediabetes in the United States; United States Department of Health and Human Services, Centers for Disease Control and Prevention: Atlanta, GA, USA, 2011.
- Gerstein, H.C.; Santaguida, P.; Raina, P.; Morrison, K.M.; Balion, C.; Hunt, D.; Yazdi, H.; Booker, L. Annual incidence and relative risk of diabetes in people with various categories of dysglycemia: A systematic overview and meta-analysis of prospective studies. Diabetes Res. Clin. Pract. 2007, 78, 305–312, doi:10.1016/j.diabres.2007.05.004.
- Finkelstein, E.A.; Trogdon, J.G.; Cohen, J.W.; Dietz, W. Annual medical spending attributable to obesity: Payer-and service-specific estimates. Health Affair. 2009, 28, 822–831, doi:10.1377/hlthaff.28.5.w822.
- Behavior Risk Factor Surveillance System, 2004–2010. Available online: http://www.vdh.virginia.gov/ofhs/prevention/diabetes/documents/2011/pdf/factsheets/Diabetes%20Prevalence/Prevalence%20of%20Diabetes%20in%20VA.pdf (accessed on 27 March 2014).
- Prevention Makes Common “Cents”; U.S. Department of Health and Human Services: Washington, DC, USA, 2003.
- American Diabetes Association (ADA). Available online: http://www.diabetes.org/diabetes-basics/diabetes-statistics/ (accessed on 10 January 2014).
- Knowler, W.C.; Barrett-Connor, E.; Fowler, S.E.; Hamman, R.F.; Lachin, J.M.; Walker, E.A.; Nathan, D.M. iabetes Prevention Program Research Group. Reduction in the incidence of type 2 diabetes with lifestyle intervention or metformin. N. Engl. J. Med. 2002, 346, 393–403, doi:10.1056/NEJMoa012512.
- Kramer, M.K.; Miller, R.G.; Venditti, E.M.; Orchard, T.J. Group lifestyle intervention for diabetes prevention in those with metabolic syndrome in primary care practice. Diabetes 2006, 55, S517, doi:10.2337/diabetes.55.02.06.db05-1066.
- Whittemore, R.; Melkus, G.; Wagner, J.; Dziura, J.; Northrup, V.; Grey, M. Translating the diabetes prevention program to primary care: A pilot study. Nurs. Res. 2009, 58, 2–12, doi:10.1097/NNR.0b013e31818fcef3.
- McBride, P.E.; Einerson, J.A.; Grant, H.; Sargent, C.; Underbakke, G.; Vitcenda, M.; Zeller, L.; Stein, J.H. Putting the diabetes prevention program into practice: A program for weight loss and cardiovascular risk reduction for patients with metabolic syndrome or type 2 diabetes mellitus. J. Nutr. Health Aging 2008, 12, S745–S749.
- Pagoto, S.L.; Kantor, L.; Bodenlos, J.S.; Gitkind, M.; Ma, Y. Translating the diabetes prevention program into a hospital-based weight loss program. Health Psychol. 2008, 27, S91–S98, doi:10.1037/0278-6133.27.1.S91.
- Seidel, M.C.; Powell, R.O.; Zgibor, J.C.; Siminerio, L.M.; Piatt, G.A. Translating the diabetes prevention program into an urban medically underserved community: A nonrandomized prospective intervention study. Diabetes Care 2008, 31, 684–689, doi:10.2337/dc07-1869.
- Ackermann, R.T.; Finch, E.A.; Brizendine, E.; Zhou, H.; Marrero, D.G. Translating the diabetes prevention program into the community. The DEPLOY pilot study. Amer. J. Prev. Med. 2008, 35, 357–363, doi:10.1016/j.amepre.2008.06.035.
- Merriam, P.A.; Tellez, T.L.; Rosal, M.C.; Olendzki, B.C.; Ma, Y.; Pagoto, S.L.; Ockene, I.S. Methodology of a diabetes prevention translational research project utilizing a community-academic partnership for implementation in an underserved Latino community. BMC Med. Res. Methodol. 2009, 9, doi:10.1186/1471-2288-9-20.
- Janetski, J.H.; Lisowski, C. Living on the edge of diabetes: A study using the diabetes prevention program in a community setting. Diabetes, 2007, 56. Available online: http://web.b.ebscohost.com/abstract?direct=true&profile=ehost&scope=site&authtype=crawler&jrnl=00121797&AN=25821186&h=kR7Zm4PnslnlI0OmIL77Vd8DpChpzz2JhZE%2fWfVH5XRdBIVeptEwohAhFD49cVapyrtgGaC%2fjSZYAa12qa9fNg%3d%3d&crl=c (accessed on 12 February 2014).
- Coppell, K.J.; Tipene-Leach, D.C.; Pahau, H.L.; Williams, S.M.; Abel, S.; Iles, M.; Hindmarsh, J.H.; Mann, J.I. Two-year results from a community-wide diabetes prevention intervention in a high risk indigenous community: The ngati and healthy project. Diabetes Res. Clin. Pract. 2009, 85, 220–227, doi:10.1016/j.diabres.2009.05.009. 19525026
- Amundson, H.A.; Butcher, M.K.; Gohdes, D.; Hall, T.O.; Harwell, T.S.; Helgerson, S.D.; Vanderwood, K.K.; Montana Cardiovascular, D.; Diabetes Prevention Program, W. Translating the diabetes prevention program into practice in the general community: Findings from the montana cardiovascular disease and diabetes prevention program. Diabetes Educator 2009, 35, doi:10.1177/0145721709333269.
- Aldana, S.G.; Barlow, M.; Smith, R.; Yanowitz, F.G.; Adams, T.; Loveday, L.; Arbuckle, J.; LaMonte, M.J. The diabetes prevention program: A worksite experience. AAOHN J. 2005, 53, 499–505. 16309012
- Boltri, J.M.; Davis-Smith, Y.M.; Seale, J.P.; Shellenberger, S.; Okosun, I.S.; Cornelius, M.E. Diabetes prevention in a faith-based setting: Results of translational research. J. Public Health Manag. Pract. 2008, 14, 29–32, doi:10.1097/01.PHH.0000303410.66485.91.
- Laws, R.A.; St. George, A.B.; Rychetnik, L.; Bauman, A.E. Diabetes prevention research: A systematic review of external validity in lifestyle interventions. Amer. J. Prev. Med. 2012, 43, 205–214, doi:10.1016/j.amepre.2012.04.017.
- Green, L.W.; Glasgow, R.E. Evaluating the relevance, generalization, and applicability of research: Issues in external validation and translation methodolog. Eval. Health Prof. 2006, 29, 126–153, doi:10.1177/0163278705284445.
- Estabrooks, P.A.; Smith-Ray, R.L. Piloting a behavioral intervention delivered through interactive voice response telephone messages to promote weight loss in a pre-diabetic population. Patient. Educ. Couns. 2008, 72, 34–41, doi:10.1016/j.pec.2008.01.007.
- Aharonovich, E.; Greenstein, E.; O’Leary, A.; Johnston, B.; Seol, S.G.; Hasin, D.S. Healthcall: Technology-based extension of motivational interviewing to reduce non-injection drug use in HIV primary care patients—A pilot study. Aids Care 2012, 24, 1461–1469, doi:10.1080/09540121.2012.663882.
- Almeida, F.A.; Shetterly, S.; Smith-Ray, R.L.; Estabrooks, P.A. Reach and effectiveness of a weight loss intervention in patients with prediabetes in Colorado. Prev. Chronic Dis. 2010, 7. Available online: http://www.cdc.gov/pcd/issues/2010/sep/09_0204.htm (accessed on 8 February 2014).
- Bambauer, K.Z.; Aupont, O.; Stone, P.H.; Locke, S.E.; Mullan, M.G.; Colagiovanni, J.; McLaughlin, T.J. The effect of a telephone counseling intervention on self-rated health of cardiac patients. Psychosom. Med. 2005, 67, 539–545, doi:10.1097/01.psy.0000171810.37958.61.
- Eakin, E.G.; Lawler, S.P.; Vandelanotte, C.; Owen, N. Telephone interventions for physical activity and dietary behavior change: A systematic review. Amer. J. Prev. Med. 2007, 32, 419–434, doi:10.1016/j.amepre.2007.01.004.
- Goode, A.D.; Owen, N.; Reeves, M.M.; Eakin, E.G. Translation from research to practice: Community dissemination of a telephone-delivered physical activity and dietary behavior change intervention. Amer. J. Health Promotion 2012, 26, 253–259, doi:10.4278/ajhp.100401-QUAL-99.
- Katula, J.A.; Blackwell, C.S.; Rosenberger, E.L.; Goff, D.C., Jr. Translating diabetes prevention programs: Implications for dissemination and policy. N. C. Med. J. 2011, 72, 405–408. 22416527
- Katz, D.L.; Murimi, M.; Gonzalez, A.; Njike, V.; Green, L.W. From controlled trial to community adoption: The multisite translational community trial. Amer. J. Public Health 2011, 101, 17–27, doi:10.2105/AJPH.2010.300104.
- Goode, A.D.; Reeves, M.M.; Eakin, E.G. Telephone-delivered interventions for physical activity and dietary behavior change: An updated systematic review. Amer. J. Prev. Med. 2012, 42, 81–88, doi:10.1016/j.amepre.2011.08.025.
- Schaum, K.D. New and revised overweight and obesity ICD-9 codes. Ostomy Wound Manag. 2006, 52, 63–64.
- Herman, W.H.; Smith, P.J.; Thompson, T.J.; Engelgau, M.M.; Aubert, R.E. A new and simple questionnaire to identify people at increased risk for undiagnosed diabetes. Diabetes Care 1995, 18, 382–387, doi:10.2337/diacare.18.3.382. 7555482
- Heikes, K.E.; Eddy, D.M.; Arondekar, B.; Schlessinger, L. Diabetes risk calculator: A simple tool for detecting undiagnosed diabetes and pre-diabetes. Diabetes Care 2008, 31, 1040–1045, doi:10.2337/dc07-1150. 18070993
- U.S. Census Bureau. American Community Survey. 2012. Available online: http://factfinder.Census.Gov/home (accessed on 13 January 2014).
- Stellefson, M.; Chaney, B.; Chaney, D. The digital divide in health education: Myth or reality? Amer. J. Health Educ. 2008, 39, 106–112, doi:10.1080/19325037.2008.10599023.
- Zickuhr, K.; Smith, A. Digital Differences. Available online: http://pewinternet.org/Reports/2012/Digital-differences.aspx (accessed on 10 January 2014).
- Lu, H.Y.; Shaw, B.R.; Gustafson, D.H. Online health consultation: Examining uses of an interactive cancer communication tool by low-income women with breast cancer. Int. J. Med. Inform. 2011, 80, 518–528, doi:10.1016/j.ijmedinf.2011.03.011.
- Glasgow, R.E.; Bull, S.S.; Piette, J.D.; Steiner, J.F. Interactive behavior change technology. A partial solution to the competing demands of primary care. Amer. J. Prev. Med. 2004, 27, 80–87, doi:10.1016/j.amepre.2004.04.026.
- Glasgow, R.E.; Christiansen, S.M.; Kurz, D.; King, D.K.; Woolley, T.; Faber, A.J.; Estabrooks, P.A.; Strycker, L.; Toobert, D.; Dickman, J. Engagement in a diabetes self-management website: Usage patterns and generalizability of program use. J. Med. Internet. Res. 2011, 13, 70–83, doi:10.2196/jmir.1686.
- Glasgow, R.E.; Edwards, L.L.; Whitesides, H.; Carroll, N.; Sanders, T.J.; McCray, B.L. Reach and effectiveness of DVD and in-person diabetes self-management education. Chron. Illness 2009, 5, 243–249, doi:10.1177/1742395309343978.
- Glasgow, R.E.; Kurz, D.; King, D.; Dickman, J.M.; Faber, A.J.; Halterman, E.; Woolley, T.; Toobert, D.J.; Strycker, L.A.; Estabrooks, P.A.; et al. Twelve-month outcomes of an internet-based diabetes self-management support program. Patient Educ. Couns. 2012, 87, 81–92, doi:10.1016/j.pec.2011.07.024.
- Almeida, F.A.; Estabrooks, P. The use of an interactive computer session to initiate physical activity in sedentary adults. Ann. Behavioral Med. 2011, 41, S183, doi:10.1007/s12160-010-9248-7.
- Schifter, D.E.; Ajzen, I. Intention, perceived control, and weight loss: An application of the theory of planned behavior. J. Personal. Soc. Psychol. 1985, 49, 843–851, doi:10.1037/0022-35188.8.131.523.
- Galea, S.; Tracy, M. Participation rates in epidemiologic studies. Ann. Epidemiol. 2007, 17, 643–653, doi:10.1016/j.annepidem.2007.03.013. 17553702
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