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  1. Article: Assessing Alternative Imputation Strategies for Infrequently Missing Items on Multi-item Scales.

    Rezvan, Panteha Hayati / Comulada, W Scott / Fernández, M Isabel / Belin, Thomas R

    Communications in statistics. Case studies, data analysis and applications

    2022  Volume 8, Issue 4, Page(s) 682–713

    Abstract: Health-science researchers often measure psychological constructs using multi-item scales and encounter missing items on some participants. Multiple imputation (MI) has emerged as an alternative ... ...

    Abstract Health-science researchers often measure psychological constructs using multi-item scales and encounter missing items on some participants. Multiple imputation (MI) has emerged as an alternative to
    Language English
    Publishing date 2022-09-01
    Publishing country United States
    Document type Journal Article
    ISSN 2373-7484
    ISSN 2373-7484
    DOI 10.1080/23737484.2022.2115430
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Dual Option Microtia Clinic: A Comparison of Outcomes in Microtia Reconstruction Using Autologous Rib or Porous Polyethylene Implant.

    Kulich, Marta / Patel, Vijay A / Rezvan, Panteha Hayati / Osterbauer, Beth / Kochhar, Amit / Gomez, Gabriel

    Facial plastic surgery & aesthetic medicine

    2023  Volume 25, Issue 4, Page(s) 290–295

    Abstract: Introduction: ...

    Abstract Introduction:
    MeSH term(s) Humans ; Male ; Child ; Child, Preschool ; Adolescent ; Female ; Plastic Surgery Procedures ; Polyethylene ; Retrospective Studies ; Congenital Microtia/surgery ; Porosity ; Ribs/surgery
    Chemical Substances Polyethylene (9002-88-4)
    Language English
    Publishing date 2023-04-20
    Publishing country United States
    Document type Journal Article ; Comment
    ZDB-ID 3006458-2
    ISSN 2689-3622 ; 2689-3614
    ISSN (online) 2689-3622
    ISSN 2689-3614
    DOI 10.1089/fpsam.2022.0406
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 5869: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  3. Article ; Online: Sex-specific impulsivity, but not other facets of executive function, predicts fat and sugar intake two-years later amongst adolescents with a healthy weight: Findings from the ABCD study.

    Adise, Shana / Boutelle, Kerri N / Rezvan, Panteha Hayati / Kan, Eric / Rhee, Kyung E / Goran, Michael I / Sowell, Elizabeth R

    Appetite

    2023  Volume 192, Page(s) 107081

    Abstract: During adolescence, processes that control food intake (executive functions [EF]) undergo extensive refinement; underlying differences in EF may explain the inability to resist overeating unhealthy foods. Yet, overeating fat and sugar also causes changes ...

    Abstract During adolescence, processes that control food intake (executive functions [EF]) undergo extensive refinement; underlying differences in EF may explain the inability to resist overeating unhealthy foods. Yet, overeating fat and sugar also causes changes to EF and cognition but disentangling these relationships has been difficult, as previous studies included youth with obesity. Here, amongst youth initially of a healthy weight, we evaluate whether 1) sex-specific underlying variation in EF/cognition at 9/10-years-old predict fat/sugar two-years later (Y2) and 2) if these relationships are moderated by body mass index (BMI), using linear mixed effects models (controlled for puberty, caregiver education; random effect: study site). Data were leveraged from Adolescent Brain Cognitive Development Study (n = 2987; 50.4% male; 15.4% Latino/a/x; 100% healthy weight at baseline; 12.4% overweight/obese by Y2, data release 4.0). EF and cognition (e.g., inhibition, cognition, motor, memory, impulsivity) were assessed with the NIH toolbox, Rey Auditory Verbal Learning Task, Little Man Task, the BIS/BAS, and UPPS-P. A saturated fat/added sugar (kcals) composite score was extracted from the validated Kids Food Block Screener. For males, greater baseline impulsivity (e.g., Positive Urgency, Lack of Planning and Perseverance) and reward (e.g., Fun seeking, Drive) was related to greater Y2 intake. For both sexes, greater baseline Negative Urgency and higher BMI was related to greater Y2 intake. No other relationships were observed. Our findings highlight a phenotype that may be more at risk for weight gain due to overconsumption of fat/sugar. Thus, prevention efforts may wish to focus on impulsive tendencies for these foods.
    MeSH term(s) Female ; Humans ; Male ; Adolescent ; Child ; Executive Function ; Obesity/psychology ; Impulsive Behavior ; Hyperphagia ; Sugars
    Chemical Substances Sugars
    Language English
    Publishing date 2023-10-14
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 1461347-5
    ISSN 1095-8304 ; 0195-6663
    ISSN (online) 1095-8304
    ISSN 0195-6663
    DOI 10.1016/j.appet.2023.107081
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Left Ventricle Size Correlates with Peak Exercise Capacity in Pediatric Cancer Survivors Exposed to Anthracycline Chemotherapy.

    Masood, Imran Ross / Rezvan, Panteha Hayati / Lee, Kyuwan / Vervaet, Helena / Kuo, Christopher / Loss, Karla / Menteer, JonDavid / Souza, Andrew / Freyer, David / Su, Jennifer A

    Pediatric cardiology

    2023  

    Abstract: Cancer survivors exposed to anthracycline chemotherapy are at risk for developing cardiomyopathy, which may have delayed clinical manifestation. In a retrospective cross-sectional study, we evaluated the utility of cardiopulmonary exercise testing (CPET) ...

    Abstract Cancer survivors exposed to anthracycline chemotherapy are at risk for developing cardiomyopathy, which may have delayed clinical manifestation. In a retrospective cross-sectional study, we evaluated the utility of cardiopulmonary exercise testing (CPET) for detecting early cardiac disease in 35 pediatric cancer survivors by examining the associations between peak exercise capacity (measured via percent predicted peak VO
    Language English
    Publishing date 2023-05-22
    Publishing country United States
    Document type Journal Article
    ZDB-ID 800857-7
    ISSN 1432-1971 ; 0172-0643
    ISSN (online) 1432-1971
    ISSN 0172-0643
    DOI 10.1007/s00246-023-03192-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1528: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  5. Article ; Online: Community health workers impact on maternal and child health outcomes in rural South Africa - a non-randomized two-group comparison study.

    le Roux, Karl W / Almirol, Ellen / Rezvan, Panteha Hayati / le Roux, Ingrid M / Mbewu, Nokwanele / Dippenaar, Elaine / Stansert-Katzen, Linnea / Baker, Venetia / Tomlinson, Mark / Rotheram-Borus, M J

    BMC public health

    2020  Volume 20, Issue 1, Page(s) 1404

    Abstract: Background: Home visits by paraprofessional community health workers (CHWs) has been shown to improve maternal and child health outcomes in research studies in many countries. Yet, when these are scaled or replicated, efficacy disappears. An effective ... ...

    Abstract Background: Home visits by paraprofessional community health workers (CHWs) has been shown to improve maternal and child health outcomes in research studies in many countries. Yet, when these are scaled or replicated, efficacy disappears. An effective CHW home visiting program in peri-urban Cape Town found maternal and child health benefits over the 5 years point but this study examines if these benefits occur in deeply rural communities.
    Methods: A non-randomized, two-group comparison study evaluated the impact of CHW in the rural Eastern Cape from August 2014 to May 2017, with 1310 mother-infant pairs recruited in pregnancy and 89% were reassessed at 6 months post-birth.
    Results: Home visiting had limited, but important effects on child health, maternal wellbeing and health behaviors. Mothers reported fewer depressive symptoms, attended more antenatal visits and had better baby-feeding practices. Intervention mothers were significantly more likely to exclusively breastfeed for 6 months (OR: 1.8; 95% CI: 1.1, 2.9), had lower odds of mixing formula with baby porridge (regarded as detrimental) (OR: 0.4; 95% CI: 0.2, 0.8) and were less likely to consult traditional healers. Mothers living with HIV were more adherent with co-trimoxazole prophylaxis (p < 0.01). Intervention-group children were significantly less likely to be wasted (OR: 0.5; 95% CI 0.3-0.9) and had significantly fewer symptoms of common childhood illnesses in the preceding two weeks (OR: 0.8; 95% CI: 0.7,0.9).
    Conclusion: The impact of CHWs in a rural area was less pronounced than in peri-urban areas. CHWs are likely to need enhanced support and supervision in the challenging rural context.
    MeSH term(s) Adolescent ; Adult ; Community Health Workers ; Effect Modifier, Epidemiologic ; Female ; Health Behavior/ethnology ; House Calls ; Humans ; Infant ; Infant Health/ethnology ; Infant, Newborn ; Maternal Health/ethnology ; Middle Aged ; Outcome Assessment, Health Care ; Pregnancy ; Program Evaluation ; Rural Population ; South Africa/epidemiology ; Young Adult
    Language English
    Publishing date 2020-09-17
    Publishing country England
    Document type Comparative Study ; Journal Article
    ZDB-ID 2041338-5
    ISSN 1471-2458 ; 1471-2458
    ISSN (online) 1471-2458
    ISSN 1471-2458
    DOI 10.1186/s12889-020-09468-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Evaluation of a weighting approach for performing sensitivity analysis after multiple imputation.

    Rezvan, Panteha Hayati / White, Ian R / Lee, Katherine J / Carlin, John B / Simpson, Julie A

    BMC medical research methodology

    2015  Volume 15, Page(s) 83

    Abstract: Background: Multiple imputation (MI) is a well-recognised statistical technique for handling missing data. As usually implemented in standard statistical software, MI assumes that data are 'Missing at random' (MAR); an assumption that in many settings ... ...

    Abstract Background: Multiple imputation (MI) is a well-recognised statistical technique for handling missing data. As usually implemented in standard statistical software, MI assumes that data are 'Missing at random' (MAR); an assumption that in many settings is implausible. It is not possible to distinguish whether data are MAR or 'Missing not at random' (MNAR) using the observed data, so it is desirable to discover the impact of departures from the MAR assumption on the MI results by conducting sensitivity analyses. A weighting approach based on a selection model has been proposed for performing MNAR analyses to assess the robustness of results obtained under standard MI to departures from MAR.
    Methods: In this article, we use simulation to evaluate the weighting approach as a method for exploring possible departures from MAR, with missingness in a single variable, where the parameters of interest are the marginal mean (and probability) of a partially observed outcome variable and a measure of association between the outcome and a fully observed exposure. The simulation studies compare the weighting-based MNAR estimates for various numbers of imputations in small and large samples, for moderate to large magnitudes of departure from MAR, where the degree of departure from MAR was assumed known. Further, we evaluated a proposed graphical method, which uses the dataset with missing data, for obtaining a plausible range of values for the parameter that quantifies the magnitude of departure from MAR.
    Results: Our simulation studies confirm that the weighting approach outperformed the MAR approach, but it still suffered from bias. In particular, our findings demonstrate that the weighting approach provides biased parameter estimates, even when a large number of imputations is performed. In the examples presented, the graphical approach for selecting a range of values for the possible departures from MAR did not capture the true parameter value of departure used in generating the data.
    Conclusions: Overall, the weighting approach is not recommended for sensitivity analyses following MI, and further research is required to develop more appropriate methods to perform such sensitivity analyses.
    MeSH term(s) Algorithms ; Computer Simulation/statistics & numerical data ; Data Interpretation, Statistical ; Humans ; Models, Statistical ; Regression Analysis
    Language English
    Publishing date 2015-10-13
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2041362-2
    ISSN 1471-2288 ; 1471-2288
    ISSN (online) 1471-2288
    ISSN 1471-2288
    DOI 10.1186/s12874-015-0074-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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