Category: Statistics

BMC Pediatr. 2023 Feb 4;23(1):61. doi: 10.1186/s12887-023-03877-7.

ABSTRACT

BACKGROUND: Feeding practices in the first two years of life have a direct impact on nutritional status and adiposity. The purpose of this study was to identify the differences in feeding practices during the first two years of life by sex and type of feeding in the first semester of postnatal life and their relationships with adiposity in toddlers.

METHODS: An analytical cross-sectional study that included 150 toddlers aged 12 to 24 months who were healthy, full-term, and had adequate weight for their gestational ages, was conducted at the New Civil Hospital and at a private practice in Guadalajara. Body compositions were obtained by bioelectrical impedance (BIA) measurements, and a modified questionnaire was used. Then, the parents completed two 24-h dietary recalls. In addition to the descriptive statistics, ANOVA, Kruskal-Wallis and Mann-Whitney U tests were used in the contrast analysis of the quantitative variables. To analyze the qualitative variables, we used X² tests. Afterward, linear regression tests were conducted to identify the relationships between adiposity and feeding practices during the first two years.

RESULTS: There were direct relationships between adiposity and duration of full breastfeeding (r = 0.610, p = 0.021), age of introduction of ultra-processed products (r = 0.311, p = 0.011), sugar (r = 0.186; p = 0.024) and age at which eggs were introduced (r = -0.202; p = 0.016).

CONCLUSIONS: Adiposity was related to feeding practices in the first two years of life in toddlers.

PMID:36739378 | DOI:10.1186/s12887-023-03877-7

BMC Oral Health. 2023 Feb 4;23(1):72. doi: 10.1186/s12903-023-02772-y.

ABSTRACT

BACKGROUND: Teledentistry has demonstrated to expedite oral health consultations, diagnosis, and treatment planning while mitigating COVID-19 transmission risk in dental offices. However, the use of teledentistry by clinicians remains suboptimal. Therefore, this study aimed to determine the perceptions and practices of teledentistry among dentists during the COVID-19 pandemic in Ontario, Canada, and identify associated factors.

METHODS: A cross-sectional study using an online 39 item survey was conducted among Ontario dentists in December 2021. The questionnaire inquired about socio-demographic attributes, as well as perceptions of teledentistry use during the pandemic, and its future application. Descriptive statistics including frequency distribution of categorical variables and univariate analysis of continuous variables were conducted. Chi-square test was used determine the associations between professionals’ attributes such as age, gender, years of practice, and location of practice, and respondents use of teledentistry. SPSS Version 28.0 was used for statistical analysis.

RESULTS: Overall, 456 dentists completed the survey. The majority were general dentists (91%), worked in private practices (94%), were between 55 and 64 years old (33%), and had over 16 years of professional experience (72%). Approximately 49.3% reported using teledentistry; 13% started before the pandemic, and 36% during the pandemic. The most common reason for non-utilization was a lack of interest (54%). Respondents identified patient triage, consultation, and patient education as the three most important uses of teledentistry. Female dentists (p < 0.05), dentist working in private practice (p < 0.05), and those who worked in a single dental office (p < 0.05) adopted teledentistry more during the pandemic. Respondents who accessed more resources were more likely to report greater utilization of teledentistry, while those who reported being unconformable with teledentistry (p < 0.05) reported less utilization. Additionally, participants who reported feeling comfortable discussing teledentistry with others (p < 0.05), were more inclined to use it in the future.

CONCLUSIONS: Participants expressed mixed perceptions toward teledentistry with more than half indicating it is reliable for patient triaging and patient follow-ups. Despite the increased utilization during the COVID-19 pandemic, participants’ lack of interest in teledentistry emerged as a barrier to its use. More education and knowledge dissemination about teledentistry’s areas of application and technical aspects of use can increase interest in this tool, which may lead to a greater uptake by dental professionals.

PMID:36739377 | DOI:10.1186/s12903-023-02772-y

BMC Pregnancy Childbirth. 2023 Feb 4;23(1):96. doi: 10.1186/s12884-023-05414-x.

ABSTRACT

BACKGROUND: Despite efforts to make maternal health care services available in rural Ethiopia, utilisation status remains low. Therefore, this study aimed to assess maternal health care services’ status and determinants in rural Ethiopia.

METHODS: The study used quasi-experimental pre- and post-comparison baseline data. A pretested, semi-structured, interviewer-administered questionnaire was used to collect data. A multilevel, mixed-effects logistic regression was used to identify individual and communal level factors associated with utilisation of antenatal care (ANC), skilled birth attendance (SBA), and postnatal care (PNC). The adjusted odds ratio (AOR) and corresponding 95% confidence intervals (CI) were estimated with a p-value of less than 0.05, indicating statistical significance.

RESULTS: Seven hundred and twenty-seven pregnant women participated, with a response rate of 99.3%. Four hundred and sixty-one (63.4%) of the women visited ANC services, while 46.5% (CI: 42-50%) of births were attended by SBA, and 33.4% (CI: 30-36%) had received PNC. Women who reported that their pregnancy was planned (aOR = 3.9; 95% CI: 1.8-8.3) and were aware of pregnancy danger signs (aOR = 6.8; 95% CI: 3.8-12) had a higher likelihood of attending ANC services. Among the cluster-level factors, women who lived in lowlands (aOR = 4.1; 95% CI: 1.1-14) and had easy access to transportation (aOR = 1.9; 95% CI: 1.1-3.7) had higher odds of visiting ANC services. Moreover, women who were employed (aOR = 3.1; 95% CI: 1.3-7.3) and attended ANC (aOR = 3.3; 95% CI: 1.8-5.9) were more likely to have SBA at delivery. The likelihood of being attended by SBA during delivery was positively correlated with shorter travel distances (aOR = 2.9; 95% CI: 1.4-5.8) and ease of access to transportation (aOR = 10; 95% CI: 3.6-29) to the closest healthcare facilities. Being a midland resident (aOR = 4.7; 95% CI: 1.7-13) and having SBA during delivery (aOR = 2.1; 95% CI: 1.2-3.50) increased the likelihood of attending PNC service.

CONCLUSIONS: Overall, maternal health service utilisation is low in the study area compared with the recommended standards. Women’s educational status, awareness of danger signs, and pregnancy planning from individual-level factors and being a lowland resident, short travel distance to health facilities from the cluster-level factors play a crucial role in utilising maternal health care services. Working on women’s empowerment, promotion of contraceptive methods to avoid unintended pregnancy, and improving access to health care services, particularly in highland areas, are recommended to improve maternal health service utilisation.

PMID:36739369 | DOI:10.1186/s12884-023-05414-x

Dig Dis Sci. 2023 Feb 4. doi: 10.1007/s10620-022-07794-0. Online ahead of print.

ABSTRACT

BACKGROUND: Tofacitinib is an oral small molecule Janus kinase inhibitor for the treatment of ulcerative colitis.

AIM: To report efficacy and infection rates in patients receiving tofacitinib induction treatment, by baseline corticosteroid status.

METHODS: We evaluated efficacy and safety data from OCTAVE Induction 1&2 in patients with moderately-to-severely active ulcerative colitis who received tofacitinib 10 mg twice daily or placebo for 8 weeks, based on induction baseline oral corticosteroid use (Corticosteroid-Yes/No) and dose (< 20/ ≥ 20 mg/day). Infections of interest included serious infections, herpes zoster (HZ), and adjudicated opportunistic infections (OIs).

RESULTS: At OCTAVE Induction 1&2 baseline, 478/1092 (43.8%) patients were receiving corticosteroids. Tofacitinib demonstrated significant induction efficacy versus placebo for both Corticosteroid-Yes and Corticosteroid-No. With adjustment for prior tumor necrosis factor inhibitor and immunosuppressant failure, there were no statistically significant differences in remission and clinical response rates for Corticosteroid-Yes versus Corticosteroid-No. Among tofacitinib-treated patients, HZ and OIs occurred more frequently in Corticosteroid-Yes versus Corticosteroid-No, regardless of dose (< 20 mg vs. ≥ 20 mg). Infection incidence rates (regardless of severity/seriousness) during tofacitinib induction were generally similar regardless of baseline corticosteroid use. The proportion of tofacitinib-treated patients with HZ was 0.2% for Corticosteroid-No versus 1.1% for Corticosteroid-Yes < 20 mg and 1.0% for Corticosteroid-Yes ≥ 20 mg. Two out of three patients had HZ OIs.

CONCLUSIONS: Tofacitinib induction efficacy (clinical response and remission) was similar in baseline corticosteroid subgroups. Infections of interest were rare; HZ and OIs occurred more frequently among those receiving tofacitinib and corticosteroids versus those receiving tofacitinib without corticosteroids.

TRIAL REGISTRATION: http://www.

CLINICALTRIALS: gov (NCT01465763[21/10/2011]; NCT01458951[21/10/2011]).

PMID:36739367 | DOI:10.1007/s10620-022-07794-0

J Perinatol. 2023 Feb 4. doi: 10.1038/s41372-023-01620-9. Online ahead of print.

ABSTRACT

BACKGROUND: Little is known on the impact of maternal age (MA) on very low birth weight (VLBW) infants’ outcomes. We tested the hypothesis that at both ends of MA there are increased adverse neonatal outcomes in VLBW infants.

METHODS: We used the Israel National Neonatal Network VLBW (≤1500 g) database. Maternal age was stratified as: <20, 20-24, 25-34 (reference group), 35-39 and ≥40 years. Statistical analyses were univariate and multivariable logistic regression analysis.

RESULTS: After adjustment, the infant outcomes of older mothers were similar to those of the reference group for mortality, RDS, severe ROP, NEC and sepsis. Mothers < 20 and 20-24 years old had higher odds of IVH grades 3-4 (OR 1.45, 95% CI 1.09-1.93 and OR 1.26, 95% CI 1.10-1.45, respectively), and BPD (OR 1.55, 95% CI 1.13-2.13 and OR 1.40, 95% CI 1.22-1.62, respectively). There were higher odds for PVL in infants of <20 year-old mothers (OR 1.83, 95% CI 1.26-2.65) and in infants of 35-39 year-old mothers (OR 1.38, 95% CI 1.12-1.69). Poor composite outcomes were significantly higher in the youngest maternal age categories (<20-year-old mothers (OR 1.63, 95% CI 1.28-2.08), and 20-24-year-old (OR 1.28, 95% CI 1.15-1.43).

CONCLUSIONS: Neonatal outcomes differ in relation to maternal age among very low birth weight newborns, with adverse outcomes more predominant in infants of younger mothers.

PMID:36739362 | DOI:10.1038/s41372-023-01620-9

Sci Rep. 2023 Feb 4;13(1):2040. doi: 10.1038/s41598-023-29058-1.

ABSTRACT

High-throughput extraction of radiomic features from low-dose CT scans can characterize the heterogeneity of the lung parenchyma and potentially aid in identifying subpopulations that may have higher risk of lung diseases, such as COPD, and lung cancer due to inflammation or obstruction of the airways. We aim to determine the feasibility of a lung radiomics phenotyping approach in a lung cancer screening cohort, while quantifying the effect of different CT reconstruction algorithms on phenotype robustness. We identified low-dose CT scans (n = 308) acquired with Siemens Healthineers scanners from patients who completed low-dose CT within our lung cancer screening program between 2015 and 2018 and had two different sets of image reconstructions kernel available (i.e., medium (I30f.), sharp (I50f.)) for the same acquisition. Following segmentation of the lung field, a total of 26 radiomic features were extracted from the entire 3D lung-field using a previously validated fully-automated lattice-based software pipeline, adapted for low-dose CT scans. The lattice in-house software was used to extract features including gray-level histogram, co-occurrence, and run-length descriptors. The lattice approach uses non-overlapping windows for traversing along pixels of images and calculates different features. Each feature was averaged for each scan within a range of lattice window sizes (W) of 4, 8 and 20 mm. The extracted imaging features from both datasets were harmonized to correct for differences in image acquisition parameters. Subsequently, unsupervised hierarchical clustering was applied on the extracted features to identify distinct phenotypic patterns of the lung parenchyma, where consensus clustering was used to identify the optimal number of clusters (K = 2). Differences between phenotypes for demographic and clinical covariates including sex, age, BMI, pack-years of smoking, Lung-RADS and cancer diagnosis were assessed for each phenotype cluster, and then compared across clusters for the two different CT reconstruction algorithms using the cluster entanglement metric, where a lower entanglement coefficient corresponds to good cluster alignment. Furthermore, an independent set of low-dose CT scans (n = 88) from patients with available pulmonary function data on lung obstruction were analyzed using the identified optimal clusters to assess associations to lung obstruction and validate the lung phenotyping paradigm. Heatmaps generated by radiomic features identified two distinct lung parenchymal phenotype patterns across different feature extraction window sizes, for both reconstruction algorithms (P < 0.05 with K = 2). Associations of radiomic-based clusters with clinical covariates showed significant differences for BMI and pack-years of smoking (P < 0.05) for both reconstruction kernels. Radiomic phenotype patterns were more similar across the two reconstructed kernels, when smaller window sizes (W = 4 and 8 mm) were used for radiomic feature extraction, as deemed by their entanglement coefficient. Validation of clustering approaches using cluster mapping for the independent sample with lung obstruction also showed two statistically significant phenotypes (P < 0.05) with significant difference for BMI and smoking pack-years. Radiomic analysis can be used to characterize lung parenchymal phenotypes from low-dose CT scans, which appear reproducible for different reconstruction kernels. Further work should seek to evaluate the effect of additional CT acquisition parameters and validate these phenotypes in characterizing lung cancer screening populations, to potentially better stratify disease patterns and cancer risk.

PMID:36739358 | DOI:10.1038/s41598-023-29058-1

J Cancer Res Clin Oncol. 2023 Feb 4. doi: 10.1007/s00432-023-04625-1. Online ahead of print.

ABSTRACT

PURPOSE: This review aims to explore the role of AI in the application of pancreatic cancer management and make recommendations to minimize the impact of the limitations to provide further benefits from AI use in the future.

METHODS: A comprehensive review of the literature was conducted using a combination of MeSH keywords, including “Artificial intelligence”, “Pancreatic cancer”, “Diagnosis”, and “Limitations”.

RESULTS: The beneficial implications of AI in the detection of biomarkers, diagnosis, and prognosis of pancreatic cancer have been explored. In addition, current drawbacks of AI use have been divided into subcategories encompassing statistical, training, and knowledge limitations; data handling, ethical and medicolegal aspects; and clinical integration and implementation.

CONCLUSION: Artificial intelligence (AI) refers to computational machine systems that accomplish a set of given tasks by imitating human intelligence in an exponential learning pattern. AI in gastrointestinal oncology has continued to provide significant advancements in the clinical, molecular, and radiological diagnosis and intervention techniques required to improve the prognosis of many gastrointestinal cancer types, particularly pancreatic cancer.

PMID:36739356 | DOI:10.1007/s00432-023-04625-1

Int Urol Nephrol. 2023 Feb 4. doi: 10.1007/s11255-023-03483-7. Online ahead of print.

ABSTRACT

PURPOSE: Benign prostatic hyperplasia (BPH) and prostate cancer (PCa) are the two most prevalent urologic diseases affecting elderly men. An inverse relationship between BPH/prostate size and PCa incidence is well documented in the current literature, but the precise mechanism is poorly understood. This study aims to investigate the effect of total prostate volume on total glandular tissue volume of the peripheral zone via a novel combination of magnetic resonance imaging (MRI) and histo-anatomical imaging.

METHODS: 42 male patients between ages 53-79 years underwent both radical prostatectomy and pre-operative MRI scans. Prostate sizes ranged from 14.8-133.3cc. Quantitative measurements of surgical capsule thickness and glandular epithelial cell density within the peripheral zone (PZ) were obtained on histo-anatomical slides using computer-based imaging software. Quantitative prostatic zonal measurements were obtained from MRI scans. Combining MRI- and histopathology-obtained parameters allowed measurement of the total glandular tissue volume of the PZ (GVPZ). Statistical analysis was performed to identify associations between total prostate volume (TPV) and GVPZ.

RESULTS: The Mann-Whitney U-test showed significant decreases in GVPZ in larger prostates when compared to smaller prostates.

CONCLUSIONS: Combined MRI and histopathology techniques provide a novel method for accurate measuring of glandular tissue content within the prostatic PZ. The findings of this pilot study support the hypothesis of PZ compression by an expanding transition zone in large BPH prostates, leading to atrophy of PZ glandular tissue. As the majority of PCa originates in the PZ, this dynamic process may explain the protective effect of large BPH prostates against PCa development.

PMID:36739353 | DOI:10.1007/s11255-023-03483-7

Heredity (Edinb). 2023 Feb 4. doi: 10.1038/s41437-023-00595-9. Online ahead of print.

ABSTRACT

A long-standing goal in the field of polyploid biology has been the derivation of mathematical models of gamete mode formation. These models form the basis of statistical inference and evolutionary theory. Here, we present 3-locus models of gamete mode formation in autotetraploids without and with preferential cross-over formation. The three loci are assumed to occur on one arm of the same chromosome. For preferential cross-over formation, one of the three loci affects the tendency for sets of sister chromatids to pair and therefore affects rates of recombination. The models are derived such that the process of double reduction is a function of rates of synaptic partner switches and recombination, as opposed to being independent of these processes. We assume potentially one synaptic partner switch per meiosis. We also assume the coefficient of coincidence is one, such that cross-over events are independent, given a set of cross-over rates. Illustrative cases are examined demonstrating differences in the gamete mode probabilities without and with preferential cross-over formation. Lastly, we explore the accuracy of maximum likelihood estimates of the probability of synaptic partner switches and preferential cross-over formation when the locus controlling preference is at a proximal, middle, or distal location on the chromosome arm. All Supplementary Information is available at https://github.com/ckgriswold/3-locus-autotetraploid-meiosis .

PMID:36739333 | DOI:10.1038/s41437-023-00595-9

Acta Med Port. 2023 Feb 1;36(2):105-112. doi: 10.20344/amp.17290. Epub 2023 Feb 1.

ABSTRACT

INTRODUCTION: A growing number of countries have legalized the process of hastening death. At a time when laws decriminalizing hastened death have been passed in the Portuguese Parliament, the development of research related with decision making regarding this issue is of crucial importance. This study seeks to evaluate, in a sample of Portuguese doctors, whether the presentation of clinical vignettes changes the agreement with the practice of hastened death compared with general scenarios.

MATERIAL AND METHODS: A questionnaire was distributed among academic physicians from medical schools across Portugal to assess their level of agreement or disagreement with the practice of hastened death. The questionnaire included eight standard cases and eight clinical vignettes framed under conditions defined by law for the practice of hastened death. Differences were analyzed using the t-Student test for paired samples.

RESULTS: There were statistically significant differences in five scenarios (t = 3.46; p < 0.05; t = 2.47; p < 0.05; t = 4.28; p < 0.05; t = 3.38; p < 0.05; t = 3.66; p < 0.05) with greater agreement concerning the clinical vignettes. The highest acceptance was found in the requests made by adults with terminal and incurable illnesses.

CONCLUSION: Agreement increased when the clinical vignette was presented in comparison with the respective standard for most of the cases of hastened death presented.

PMID:36738190 | DOI:10.20344/amp.17290