Tag: statistics

Rheumatol Int. 2021 Feb 24. doi: 10.1007/s00296-021-04791-w. Online ahead of print.

ABSTRACT

To study the association of smoking status and the level of seropositivity in RA patients from COMORA Cohort. A post hoc analysis of COMORA database included 3439 RA patients was performed. Current smokers or recently quitted (< 3 years) were initially compared to those who never smoked or stopped > 3 years (Group I vs. II) regarding their seropositivity status (high positive, low positive and negative) for Rheumatoid Factor (RF) or Anti-citrullinated antibodies (ACPA). A further comparison was made between current smokers (Group III) and never smoked patients (Group IV). Analysis was also done on the individual country level for the 17 countries included in the COMORA study. Out of 3439 RA patients, 705 (20.5%) were smokers (group I), and 2734 (79.5%) were non-smokers (group II). Significantly more patients in group I, 442 (62.7%), had high levels of seropositivity than those in group II, 1556 (56.9%), [P = 0.006, OR 1.27 (95% CI, 1.07-1.5)]. More current smoker patients (group III-286 out of 456 “62.7%”) had high levels of seropositivity than never smoked patients (group IV-1236 out of 2191 “56.4%”), with significant difference [P = 0.013, OR 1.3 (95% CI, 1.06-1.6)]. In 11 countries, higher proportions of patients with high level of seropositivity in group I was found, with statistical significance in four countries. Smoking was associated with higher level of seropositivity in patients with RA in this post hoc analysis, both on a global level and in certain individual countries. As smoking is a modifiable risk factor, studying the effects of quitting smoking on level of seropositivity and other disease parameters is warranted.

PMID:33625544 | DOI:10.1007/s00296-021-04791-w

Neuroradiology. 2021 Feb 24. doi: 10.1007/s00234-021-02676-0. Online ahead of print.

ABSTRACT

PURPOSE: Results of surgical or endovascular treatment of intracranial aneurysms are often assessed using angiography. A reliable method to report results irrespective of treatment modality is needed to enable comparisons. Our goals were to systematically review existing classification systems, and to propose a 3-point classification applicable to both treatments and assess its reliability.

METHODS: We conducted two systematic reviews on classification systems of angiographic results after clipping or coiling to select a simple 3-category scale that could apply to both treatments. We then circulated an electronic portfolio of angiograms of clipped (n=30) or coiled (n=30) aneurysms, and asked raters to evaluate the degree of occlusion using this scale. Raters were also asked to choose an appropriate follow-up management for each patient based on the degree of occlusion. Agreement was assessed using Krippendorff’s α statistics (α_K), and relationship between occlusion grade and clinical management was analyzed using Fisher’s exact and Cramer’s V tests.

RESULTS: The systematic reviews found 70 different grading scales with heterogeneous reliability (kappa values from 0.12 to 1.00). The 60-patient portfolio was independently evaluated by 19 raters of diverse backgrounds (neurosurgery, radiology, and neurology) and experience. There was substantial agreement (α_K=0.76, 95%CI, 0.67-0.83) between raters, regardless of background, experience, or treatment used. Intra-rater agreement ranged from moderate to almost perfect. A strong relationship was found between angiographic grades and management decisions (Cramer’s V: 0.80±0.12).

CONCLUSION: A simple 3-point scale demonstrated sufficient reliability to be used in reporting aneurysm treatments or in evaluating treatment results in comparative randomized trials.

PMID:33625550 | DOI:10.1007/s00234-021-02676-0

JAMA Netw Open. 2021 Feb 1;4(2):e210061. doi: 10.1001/jamanetworkopen.2021.0061.

ABSTRACT

IMPORTANCE: Persons with opioid use disorder (OUD) and co-occurring alcohol use disorder (AUD) are understudied and undertreated. It is unknown whether the use of medications to treat OUD is associated with reduced risk of alcohol-related morbidity.

OBJECTIVE: To determine whether the use of OUD medications is associated with decreased risk for alcohol-related falls, injuries, and poisonings in persons with OUD with and without co-occurring AUD.

DESIGN, SETTING, AND PARTICIPANTS: This recurrent-event, case-control, cohort study used prescription claims from IBM MarketScan insurance databases from January 1, 2006, to December 31, 2016. The sample included persons aged 12 to 64 years in the US with an OUD diagnosis and taking OUD medication who had at least 1 alcohol-related admission. The unit of observation was person-day. Data analysis was performed from June 26 through September 28, 2020.

EXPOSURES: Days of active OUD medication prescriptions, with either agonist (ie, buprenorphine or methadone) or antagonist (ie, oral or extended-release naltrexone) treatments compared with days without OUD prescriptions.

MAIN OUTCOMES AND MEASURES: The primary outcome was admission for any acute alcohol-related event defined by International Classification of Diseases, Ninth Revision and International Statistical Classification of Diseases and Related Health Problems, Tenth Revision codes. Conditional logistic regression was used to compare OUD medication use between days with and without an alcohol-related event. Stratified analyses were conducted between patients with OUD with and without a recent AUD diagnostic code.

RESULTS: There were 8 424 214 person-days of observation time among 13 335 participants who received OUD medications and experienced an alcohol-related admission (mean [SD] age, 33.1 [13.1] years; 5884 female participants [44.1%]). Agonist treatments (buprenorphine and methadone) were associated with reductions in the odds of any alcohol-related acute event compared with nontreatment days, with a 43% reduction for buprenorphine (odds ratio [OR], 0.57; 95% CI, 0.52-0.61) and a 66% reduction for methadone (OR, 0.34; 95% CI, 0.26-0.45). The antagonist treatment naltrexone was associated with reductions in alcohol-related acute events compared with nonmedication days, with a 37% reduction for extended-release naltrexone (OR, 0.63; 95% CI, 0.52-0.76) and a 16% reduction for oral naltrexone (OR, 0.84; 95% CI, 0.76-0.93). Naltrexone use was more prevalent among patients with OUD with recent AUD claims than their peers without AUD claims.

CONCLUSIONS AND RELEVANCE: These findings suggest that OUD medication is associated with fewer admissions for alcohol-related acute events in patients with OUD with co-occurring AUD.

PMID:33625511 | DOI:10.1001/jamanetworkopen.2021.0061

Obesity (Silver Spring). 2021 Mar;29(3):500-511. doi: 10.1002/oby.23090.

ABSTRACT

The basis of heat generated by the human body has been a source of speculation and research for more than 2,000 years. Basal heat production, now usually referred to as resting energy expenditure (REE), is currently recognized as deriving from biochemical reactions at subcellular and cellular levels that are expressed in the energy expended by the body’s 78 organs and tissues. These organs and tissues, and the 11 systems to which they belong, influence body size and shape. Connecting these subcellular-/cellular-level reactions to organs and tissues, and then on to body size and shape, provides a comprehensive understanding of individual differences in REE, a contemporary topic of interest in obesity research and clinical practice. This review critically examines these linkages, their association with widely used statistical and physiological REE prediction formulas, and often-unappreciated aspects of measuring basal heat production in humans.

PMID:33624441 | DOI:10.1002/oby.23090

Int J Older People Nurs. 2021 Feb 23:e12367. doi: 10.1111/opn.12367. Online ahead of print.

ABSTRACT

BACKGROUND: Translating nutrition knowledge into care practice is challenging since multiple factors can affect the implementation process. This study examined the impact of two implementation strategies, that is external facilitation (EF) and educational outreach visits (EOVs), on the organisational context and individual factors when implementing nutritional guidelines in a nursing home (NH) setting.

METHODS: The EF strategy was a one-year, multifaceted (including support, guidance, a practice audit and feedback) intervention given to four NH units. The EOV strategy was a three-hour lecture about the nutritional guidelines given to four other NH units. Both strategies were directed at selected NH teams, consisting of a unit manager, a nurse and 5-10 care staff. A questionnaire was distributed, before and after the interventions, to evaluate the prerequisites for the staff to use the guidelines. Three conditions were used to examine the organisational context and the individual factors: the staff’s ability and willingness to implement the nutritional guidelines and their understanding of them. Confirmatory factor analysis and structural equation models were used for the data analysis.

RESULTS: The results indicated that on average, there was a significant increase in the staff’s ability to implement the nutritional guidelines in the EF group. The staff exposed to the EF strategy experienced better resources to implement the guidelines in terms of time, tools and support from leadership and a clearer assignment of responsibility regarding nutrition procedures. There was no change in staff’s willingness and understanding of the guidelines in the EF group. On average, no significant changes were observed for the staff’s ability, willingness or understanding in the EOV group.

CONCLUSIONS: A long-term, active and flexible implementation strategy (i.e. EF) affected the care staff’s ability to implement the nutritional guidelines in an NH setting. No such impact was observed for the more passive, educational approach (i.e. EOV).

PMID:33624452 | DOI:10.1111/opn.12367

J Biomed Opt. 2021 Feb;26(2). doi: 10.1117/1.JBO.26.2.026004.

ABSTRACT

SIGNIFICANCE: Current imaging paradigms for differential diagnosis of suspicious breast lesions suffer from high false positive rates that force patients to undergo unnecessary biopsies. Diffuse optical spectroscopic imaging (DOSI) noninvasively probes functional hemodynamic and compositional parameters in deep tissue and has been shown to be sensitive to contrast between normal and malignant tissues.

AIM: DOSI methods are under investigation as an adjunct to mammography and ultrasound that could reduce false positive rates and unnecessary biopsies, particularly in radiographically dense breasts.

METHODS: We performed a retrospective analysis of 212 subjects with suspicious breast lesions who underwent DOSI imaging. Physiological tissue parameters were z-score normalized to the patient’s contralateral breast tissue and input to univariate logistic regression models to discriminate between malignant tumors and the surrounding normal tissue. The models were then used to differentiate malignant lesions from benign lesions.

RESULTS: Models incorporating several individual hemodynamic parameters were able to accurately distinguish malignant tumors from both the surrounding background tissue and benign lesions with area under the curve (AUC) ≥0.85. Z-score normalization improved the discriminatory ability and calibration of these predictive models relative to unnormalized or ratio-normalized data.

CONCLUSIONS: Findings from a large subject population study show how DOSI data normalization that accounts for normal tissue heterogeneity and quantitative statistical regression approaches can be combined to improve the ability of DOSI to diagnose malignant lesions. This improved diagnostic accuracy, combined with the modality’s inherent logistical advantages of portability, low cost, and nonionizing radiation, could position DOSI as an effective adjunct modality that could be used to reduce the number of unnecessary invasive biopsies.

PMID:33624457 | DOI:10.1117/1.JBO.26.2.026004

J Biomed Opt. 2021 Feb;26(2). doi: 10.1117/1.JBO.26.2.020502.

ABSTRACT

SIGNIFICANCE: Mechanical assessment of the cornea can provide important structural and functional information regarding its health. Current clinically available tools are limited in their efficacy at measuring corneal mechanical properties. Elastography allows for the direct estimation of mechanical properties of tissues in vivo but is generally performed using external excitation force.

AIM: To show that heartbeat optical coherence elastography (Hb-OCE) can be used to assess the mechanical properties of the cornea in vivo.

APPROACH: Hb-OCE was utilized to detect Hb-induced deformations in the rabbit cornea in vivo without the need for external excitation. Furthermore, we demonstrate how this technique can distinguish corneal stiffness between untreated (UT) and crosslinked (CXL) tissue.

RESULTS: Our results demonstrate that stiffness changes in the cornea can be detected using only the Hb-induced deformations in the cornea. Additionally, we demonstrate a statistically significant difference in strain between the UT and CXL corneas.

CONCLUSIONS: Hb-OCE may be an effective tool for assessing the mechanical properties of the cornea in vivo without the need for external excitation. This tool may be effective for clinical assessment of corneal mechanical properties because it only requires optical coherence tomography imaging and data processing.

PMID:33624461 | DOI:10.1117/1.JBO.26.2.020502

Int J Lang Commun Disord. 2021 Feb 23. doi: 10.1111/1460-6984.12593. Online ahead of print.

ABSTRACT

BACKGROUND: A range of factors may impact whether children access speech-language pathology (SLP) services, beyond their communication difficulties. For instance, co-occurring psychosocial difficulties may amplify children’s observable difficulties, leading to greater access. It is important to examine such associations because they may reflect inherent differences between children with language difficulties who access services and those who do not, indicating under-servicing for subgroups in the community.

AIMS: The first aim was to examine possible differences in psychosocial difficulties between children with language difficulties who did versus did not access SLP services in the past 12 months. The second aim was to examine the unique contribution of psychosocial difficulties to service access, over and above language difficulties and other common predictors of service access.

METHODS & PROCEDURES: Analyses were carried out on data gathered from 808 eleven-year-old children who took part in the Early Language in Victoria Study (ELVS). Children were categorized as having language difficulties based on their CELF-4 Core Language Score with a cut-point of > 1.25 SD below the mean. The primary outcome measure was access to SLP services in the past 12 months. Comparison and predictor variables included children’s psychosocial difficulties, language skills, relevant demographic variables (gender, caregiver education) and prior SLP access.

OUTCOMES & RESULTS: A total of 42 children with language difficulties who had accessed SLP services had significantly greater psychosocial difficulties than those who had not (SDQ Total Difficulties, U = 53.00, z = -4.080, p < 0.001). Using binary logistic regression, a model examining child gender, caregiver education, psychosocial difficulties (internalizing and externalizing behaviours), language difficulties and prior SLP access (in earlier years) was significant χ² (8) = 137.285, p< 0.001, with increased externalizing difficulties (OR = 1.213, p < 0.001), increased communication difficulties (OR = 0.949, p < 0.001), and prior SLP access (OR = 7.430, p < 0.001) identified as unique predictors of service access.

CONCLUSIONS & IMPLICATIONS: The results indicate that children with language difficulties who have comorbid psychosocial difficulties are more likely to access services than those who do not. Accordingly, children with language difficulties who access clinical services may require interdisciplinary support, while children without co-morbid psychosocial difficulties may be under-referred for SLP services. What this paper adds What is already known on this subject There is evidence that a range of personal and contextual factors impact the likelihood of a person accessing healthcare services beyond the specific issue of concern. What this paper adds to existing knowledge In this population-based study, we provide statistical evidence that children with language difficulties who had higher levels of psychosocial difficulties were more likely to access SLP services than those who had lower levels. What are the potential or actual clinical implications of this work? Children with language difficulties who access SLP services may require support for psychosocial difficulties, while children who do not have comorbid difficulties may be underserviced in the community.

PMID:33624420 | DOI:10.1111/1460-6984.12593

Vet Comp Oncol. 2021 Feb 23. doi: 10.1111/vco.12688. Online ahead of print.

ABSTRACT

Feline oral squamous cell carcinoma (FOSCC) is a frequent and progressively invasive tumour. Early lesions are difficult to recognize based on the sole clinical examination and may be misinterpreted as non-neoplastic. Mutations of TP53 and epigenetic alterations of specific genes are present in FOSCC and may be early detected. Aim of this prospective study was to investigate the DNA methylation pattern of a 17-gene panel and TP53 mutational status of FOSCC cytological samples obtained by oral brushing. Results were compared with a control group, in order to validate this non-invasive procedure for the screening of FOSCC. In FOSCC, the same analyses were carried out on the corresponding histological sample, if available. Thirty-five FOSCC and 60 controls were included. Mutations of TP53 were detected in 17 FOSCC brushings (48%) and in none of the controls (P < 0.001). Six genes (ZAP70, FLI1, MiR124-1, KIF1A, MAGEC2, MiR363) were differentially methylated in FOSCC and were included in a methylation score. An algorithm based on TP53 mutational status and methylation score allowed to differentiate FOSCC from controls with a 69% sensitivity and a 97% specificity (accuracy, 86%). In 19 FOSCC histological samples, TP53 mutational status was fully concordant with brushings, and a positive methylation score was observed in all cases. These results are promising for the identification of FOSCC by oral brushing, although some factors may limit the accuracy of this technique, and further studies are required to assess its reproducibility in clinical practice. This article is protected by copyright. All rights reserved.

PMID:33624422 | DOI:10.1111/vco.12688

J Eval Clin Pract. 2021 Feb 23. doi: 10.1111/jep.13553. Online ahead of print.

ABSTRACT

OBJECTIVE: To assess knowledge, attitudes, and perceived barriers (KAP) regarding e-cigarette use counselling among adolescent healthcare clinical staff in an urban system, and to compare results between providers and rooming staff.

METHODS: Primary care clinical staff (n = 169) completed an anonymous survey. Descriptive statistics and Chi-square tests were used to summarize data and compare KAP between medical providers and rooming staff.

RESULTS: Staff wanted to learn more about e-cigarettes (87.6%). The most common knowledge deficits were how to use the 5As + 5Rs model for tobacco cessation counselling (66.7%) and the chemical content of e-liquids (55.4%), with no differences across groups. Overall, 58% of providers expressed confidence in their ability to talk with adolescent patients about e-cigarette use. The most common barriers to counselling were low knowledge about e-cigarettes (74.0%) and how to refer adolescent patients for cessation support (43.8%).

CONCLUSIONS: Provider and rooming staff expressed similar educational needs surrounding e-cigarettes, counselling, and treatment for adolescent patients. Clinical staff expressed confidence in their ability to affect change. There were no differences in the identified knowledge gaps or barriers to care between rooming staff and providers, suggesting that the same educational format can be used to target both groups.

PMID:33624429 | DOI:10.1111/jep.13553