Daniel Croymans's research while affiliated with Los Angeles County Department of Mental Health and other places

Publications (17)

Article
Full-text available
Policymakers and business leaders often use peer comparison information—showing people how their behavior compares to that of their peers—to motivate a range of behaviors. Despite their widespread use, the potential impact of peer comparison interventions on recipients’ well-being is largely unknown. We conducted a 5-mo field experiment involving 1...
Article
Importance: Colorectal cancer (CRC) screening reduces CRC mortality; however, screening rates remain well below the national benchmark of 80%. Objective: To determine whether an electronic primer message delivered through the patient portal increases the completion rate of CRC screening in a mailed fecal immunochemical test (FIT) outreach progra...
Article
Full-text available
Background: Little information exists on how COVID-19 testing influences intentions to engage in risky behavior. Understanding the behavioral effects of diagnostic testing may highlight the role of adequate testing on controlling viral transmission. In order to evaluate these effects, simulated scenarios were conducted evaluating participant inten...
Article
Background: Access to primary care was hindered by the coronavirus disease 2019 (COVID-19) pandemic. Objective: Evaluate changes in health screening rates before and during the pandemic. Design: Retrospective analysis of health maintenance and disease management screening rates among primary care patients before and during the pandemic. Parti...
Article
Full-text available
Background The fecal immunochemical test (FIT) is a common colorectal cancer screening modality in the USA but often is not followed by diagnostic colonoscopy.AimsWe investigated the efficacy of patient navigation to increase diagnostic colonoscopy after positive FIT results and determined persistent barriers to follow-up despite navigation in a la...
Article
Full-text available
Enhancing vaccine uptake is a critical public health challenge1. Overcoming vaccine hesitancy2,3 and failure to follow-through on vaccination intentions3 requires effective communication strategies3,4. We present two sequential randomized controlled trials (RCTs) to test the impact of behavioral interventions on COVID-19 vaccine uptake. We designed...
Preprint
Full-text available
Fighting the COVID-19 pandemic requires quick and effective strategies to maximize vaccine uptake. We present two sequential randomized controlled trials (RCTs) that tackle this challenge with behavioral science insights. We deliver text-based nudges to UCLA Health patients one day (first RCT; N=113,229) and eight days (second RCT; N=90,662) after...
Preprint
Full-text available
Background: Little information exists on how COVID-19 testing availability influences intentions to engage in risky behavior. Understanding the behavioral effects of testing availability may provide insight into the role of adequate testing on controlling viral transmission. Objective: To evaluate the impact of testing availability on behavioral in...
Article
Intervention This pilot study was a 16-week Telehealth intervention using wearable devices, automated text messaging, and trained health coaching, in primary care clinics of an academic medical center. Thirty patients were enrolled in three cohorts, ages 18-64, BMI > 27, and MVPA < 150 minutes per week. The primary outcome was weight loss per week....

Citations

... Conversely, Ramírez et al. did not find significant variations in vaccination coverage during the pandemic, describing a 0.4% absolute increase in the temporal trend of vaccination coverage in women aged 15-55 years not included in national vaccination programs (Ramírez et al., 2022). screening was identified in 20 reports, which varied considerably according to study periods and outcomes (Table 2), which sourced data from healthcare administrative databases, hospital medical records, cancer registries, pathology records, or web surveys (Acuti Martellucci et al., 2021;Bonadio et al., 2021;Davies et al., 2022;de Pelsemaeker et al., 2021;DeGroff et al., 2021;Dema et al., 2022;Dennis et al., 2021;Desta et al., 2021;Doubova et al., 2021;Gorin et al., 2021;Istrate-Ofițeru et al., 2021;Ivanuš et al., 2021;Kim et al., 2022;Koczkodaj et al., 2021;Laing and Johnston, 2021;Li et al., 2021;Mantellini et al., 2020;Meggetto et al., 2021;Miller et al., 2021;Morais et al., 2021;Nogami et al., 2022;Ortiz et al., 2021;Van Wyk et al., 2021;Walker et al., 2021). Seven studies evaluated the impact of COVID-19 on the number of Pap smears performed during the first half of 2020: of those, four were conducted in Europe and reported a reduction ranging from 43.3% and 91.5% (Acuti Martellucci et al., 2021;de Pelsemaeker et al., 2021;Ivanuš et al., 2021;Mantellini et al., 2020), while the other conducted in America observed a reduction between 84% and 91.5%, or of more than two-third during the pandemic, compared to the reference periods (DeGroff et al., 2021;Ortiz et al., 2021). ...
... explained by the association between psychological impact and sleep quality with the intensity of lifestyle behaviors. Studies have demonstrated that more intensive physical activity was needed to achieve greater psychological health.44,45 Our findings should be considered in light of some limitations.Using a web-based questionnaire with a convenience sampling technique raises the generalizability issue while the cross-sectional study design hinders us to infer causality. ...
... Parents of vaccinated children can come forward to encourage other parents to bring their children for immunisation. The Australian family physician had provided some tips in dealing with vaccination refusers such as taking permission to discuss briefly, empathetic confrontations of firmly held religious beliefs, providing detailed information on risk related to infection and making an appointment to follow up [11]. ...
... The escape also depends on how the institutions reach the citizens through mTech. Subtleties in the composition of messages and the language used to reach them are therefore also important to affect their behaviour [48]. In [48], the authors presented two sequential randomized controlled trials (RCTs) that tackle this challenge with behavioural science insights. ...
... While many people are enthusiastic about getting a COVID-19 vaccine, others remain hesitant [1][2][3][4][5][6][7][8] . A highly active research agenda therefore explores factors and policies that may encourage vaccinations [9][10][11][12][13][14] . ...
... The interaction results between time and group showed a trend in which declines were more pronounced in participants in the experimental group, while adherence in the control group was more stable over time. Thus, at first glance, our study seems to expose a behavioral pitfall of weekly saliva tests in schools, namely reduced engagement in regular hand washing, physical distancing, limiting social contacts, and wearing face masks, a finding that is in line with the risk compensation hypothesis (Hedlund, 2000) and findings from prior COVID-testing programs (Blake et al., 2020;Zhang et al., 2021). However, note that adherence among school staff in the current sample was already remarkably high at baseline and more pronounced compared to the group participants that dropped out throughout the study, which might indicate a ceiling effect. ...
... These strategies may include prioritizing scheduling of diagnostic vs. screening colonoscopy; implementing standard tracking and reporting procedures; administrative algorithms that identify the appropriate follow-up needs of individual patients based on test results; and automated phone calls linked to test results, progressing to personal phone calls, as needed [38,39]. More intensive navigation may also be needed to reduce disparities in follow-up among underserved patients [40]. ...