Tag: statistics

Indian J Dermatol Venereol Leprol. 2022 Jan 31:1-10. doi: 10.25259/IJDVL_1276_20. Online ahead of print.

ABSTRACT

BACKGROUND: The role of dermoscopy in distinguishing the histopathological subtypes of basal cell carcinoma (BCC) is not fully elucidated.

AIMS: To determine the accuracy of dermoscopy in diagnosing different BCC subtypes.

METHODS: The dermoscopic features of 102 histopathologically verified BCCs were studied retrospectively. The tumours were classified as superficial (n=33,32.3%), nodular (n=46,45.1%) and aggressive (n=23,22.6%) BCCs by histopathology. Statistical analysis included Cohen’s kappa test, proportion of correlation, measures of diagnostic accuracy, diagnostic odds ratio and the credibility ratio of positive (LR+) and negative (LR-) tests.

RESULTS: The highest value in all performed tests was seen in superficial BCCs (kappa 0.85; proportion of correlation 93%; diagnostic accuracy 93.1%), good correlation was noted in nodular BCCs (kappa 0.62, proportion of correlation 80%; diagnostic accuracy 80.4%) but dermoscopic correlation with histopathology was low for aggressive BCCs (kappa 0.13; proportion of correlation 79%; diagnostic accuracy 78.4%). Short, fine telangiectasias (83.3%) showed the greatest importance for the diagnosis of superficial BCCs, blue-grey ovoid nests (61.8%) had the highest diagnostic accuracy in nodular BCCs, while arborising vessels (79.4%) was the most significant dermoscopic feature for the diagnosis of aggressive BCCs.

LIMITATIONS: This was a retrospective analysis and included only Caucasian patients from a single centre.

CONCLUSION: The highest agreement of dermoscopic features with the histologic type was found in superficial BCCs. We did not find any specific dermoscopic structure that could indicate a diagnosis of aggressive BCC. The presence of relevant dermoscopic features in the evaluated cases was determined by the depth of tumour invasion and not by its histology.

PMID:35146979 | DOI:10.25259/IJDVL_1276_20

United European Gastroenterol J. 2022 Feb 10. doi: 10.1002/ueg2.12189. Online ahead of print.

ABSTRACT

BACKGROUND: Previously published short-term results (week 16) of this trial showed a significant improvement in clinical, radiologic and biochemical outcomes in Crohn’s disease patients with therapy-refractory perianal fistulas after treatment with hyperbaric oxygen therapy.

OBJECTIVE: To assess the long-term (week 60) efficacy, safety and feasibility of hyperbaric oxygen therapy in perianal fistula in Crohn’s disease.

METHODS: Crohn’s disease patients with high perianal fistula(s) failing conventional treatment >6 months were included. Exclusion criteria were presence of a stoma, rectovaginal fistula(s) and recent changes in treatment regimens. Patients received 40 hyperbaric oxygen sessions and outcomes were assessed at week 16 and week 60.

RESULTS: Twenty patients were included (median age 34 years). At week 16, median scores of the perianal disease activity index and modified Van Assche index (co-primary outcomes) decreased from 7.5 (95% CI 6-9) to 4 (95% CI 3-6, p < 0.001) and 9.2 (95% CI 7.3-11.2) to 7.3 (95% CI 6.9-9.7, p = 0.004), respectively. At week 60, the respective scores remained significantly lower than baseline: 4 (95% CI 3-7, p < 0.001) and 7.7 (95% CI 5.2-10.2, p = 0.003). Perianal disease activity index score of 4 or less (representing inactive perianal disease) was observed in 13 patients at week 16 and 12 patients at week 60. Using fistula drainage assessment, 12 and 13 patients showed a clinical response at week 16 and 60, respectively, and clinical remission was achieved in four patients for both time points. At week 16, a statistically significant biochemical improvement (C-reactive protein and faecal calprotectin levels) was found, but this effect was no longer significant at week 60.

CONCLUSIONS: The clinical and radiologic improvement of perianal fistula in Crohn’s disease, that was found at week 16 after treatment with hyperbaric oxygen therapy, is maintained at 1-year follow-up.

PMID:35146959 | DOI:10.1002/ueg2.12189

Dent Traumatol. 2022 Feb 11. doi: 10.1111/edt.12735. Online ahead of print.

ABSTRACT

BACKGROUND/AIMS: Paediatric maxillofacial trauma accounts for 15% of all maxillofacial trauma but remains a leading cause of mortality. The aim of this prospective, multicentric epidemiological study was to analyse the characteristics of maxillofacial fractures in paediatric patients managed in 14 maxillofacial surgery departments on five continents over a 1-year period.

METHODS: The following data were collected: age (preschool [0-6 years], school age [7-12 years], and adolescent [13-18 years]), cause and mechanism of the maxillofacial fracture, alcohol and/or drug abuse at the time of trauma, fracture site, Facial Injury Severity Scale score, associated injuries, day of the maxillofacial trauma, timing and type of treatment, and length of hospitalization. Statistical analyses were performed using SPSS software.

RESULTS: Between 30 September 2019 and 4 October 2020, 322 patients (male:female ratio, 2.3:1) aged 0-18 years (median age, 15 years) were hospitalized with maxillofacial trauma. The most frequent causes of the trauma were road traffic accidents (36%; median age, 15 years), followed by falls (24%; median age, 8 years) and sports (21%; median age, 14 years). Alcohol and/or drug abuse was significantly associated with males (p < .001) and older age (p < .001). Overall, 474 fractures were observed (1.47 per capita). The most affected site was the mandibular condyle in children <13 years old and the nose in adolescents. The proportion of patients who underwent open reduction and internal fixation increased with age (p < .001).

CONCLUSION: The main cause of paediatric maxillofacial fractures was road traffic accidents, with the highest rates seen in African and Asian centres, and the frequency of such fractures increased with age. Falls showed an inverse association with age and were the leading cause of trauma in children 0-6 years of age. The choice of treatment varies with age, reflecting anatomical and etiological changes towards patterns more similar to those seen in adulthood.

PMID:35146900 | DOI:10.1111/edt.12735

Nurs Health Sci. 2022 Feb 10. doi: 10.1111/nhs.12928. Online ahead of print.

ABSTRACT

Nurse shortages and nurse attrition are high in many countries, and there is also a dearth of male nurses in the profession. This study aimed to examine the level of intention to stay and ten predictors of this among male nurses in China. A descriptive, predictive study was administered to 480 registered male nurses. Eight research instruments were used to collect data. Descriptive statistics and binary logistic regression were employed to analyze the data. The overall intention to stay in the nursing profession as perceived by male nurses was at a moderate level. Binary logistic regression demonstrated that work group cohesion, transformational leadership, career growth, and job satisfaction were significant predictors, explaining 32.2% of the total variance for intention to stay. The findings of this study provide suggestions for nursing administrators and policymakers to develop appropriate strategies or interventions to increase the intention to stay for male nurses to stay in the profession, based on the four predictors.

PMID:35146863 | DOI:10.1111/nhs.12928

Nurs Crit Care. 2022 Feb 10. doi: 10.1111/nicc.12744. Online ahead of print.

ABSTRACT

BACKGROUND: Employee bullying and burnout are two crucial, prevalent and challenging concepts that adversely affect organizational staff behaviours. Also, adverse patient care is associated with nurse bullying and burnout.

AIM/S: This study aimed to assess the incidence and association between workplace bullying and occupational burnout among nurses in critical care units in Iran.

STUDY DESIGN: A cross-sectional descriptive study.

METHODS: The subjects were 184 nurses from critical care units in 6 teaching hospitals in Iran. Three questionnaires were distributed among the study population; (a) demographic characteristics questionnaire, (b) Maslach Burnout Inventory (MBI) and (c) bullying at Workplace Questionnaire. Descriptive statistics were used to present the workplace bullying and occupational burnout status among nurses. Linear and logistic regression analyses were conducted to estimate the relationship between workplace bullying with MBI and nurses’ demographic characteristics, respectively.

RESULTS: 62% of the nurses had moderate emotional exhaustion, 59.8% had moderate depersonalization and 46.2% had a moderate individual achievement. 75.5% faced workplace bullying. There was a positive and significant association between bullying scores and burnout in total (Pearson’s r = 0.598, p < 0.001). Linear regression test showed a positive and significant relationship between bullying with MBI dimensions (R = 0.613, p < 0.001) for emotional exhaustion, (R = 0.679, p < 0.001) for depersonalization and (R = -0.417, p < 0.001) for individual achievement.

CONCLUSIONS: Among Iranian nurses, bullying is a prominent and substantial issue that significantly correlates with their negative performance by enhancing job burnout.

RELEVANCE TO CLINICAL PRACTICE: It is suggested that some measures are adopted to avoid workplace bullying and to reduce occupational burnout for nurses. Managers should create an environment that encourages nurses to voice their concerns – informing nurses about their rights and creating a positive atmosphere in the hospital.

PMID:35146848 | DOI:10.1111/nicc.12744

Eur J Neurol. 2022 Feb 11. doi: 10.1111/ene.15280. Online ahead of print.

ABSTRACT

BACKGROUND: Effectiveness of autologous haematopoietic stem-cell transplantation (AHSCT) in relapsing-remitting multiple sclerosis (MS) is well known, but in secondary-progressive (SP-) MS it is still controversial. Therefore, AHSCT activity was evaluated in SP-MS using low-dose immunosuppression with cyclophosphamide (Cy) as a comparative treatment.

METHODS: Retrospective monocentric 1:2 matched study in SP-MS patients treated with BEAM-AHSCT (cases) or IV pulses of Cy (controls) at a single Academic centre in Florence. Controls were selected according to baseline characteristics adopting cardinality matching after trimming on the estimated propensity-score. Kaplan-Meier and Cox analyses were used to estimate survival free from relapses (R-FS), disability progression (P-FS) and NEDA-2.

RESULTS: 93 SP-MS were included: 31 AHSCT, 62 Cy. Mean follow-up: 99 months in the AHSCT and 91 months in the Cy groups. R-FS was higher in AHSCT compared to Cy patients: at year 5, 100% vs 52% respectively (p<0.0001). P-FS did not differ between the groups (at year 5: 70% in AHSCT and 81% in Cy, p=0.572), nor did NEDA-2 (p=0.379). A sensitivity analysis including the 31 “best-matched” controls only confirmed these results. Three neoplasms (2 Cy, 1 AHSCT) and two fatalities (2 Cy) occurred.

CONCLUSION: This study provides Class III evidence, in SP-MS, on the superior effectiveness of AHSCT compared to Cy on relapse activity, without differences on disability accrual. Despite the suppression of relapses was observed in the AHSCT group only, AHSCT did not show advantages over Cy on disability, suggesting that in SP-MS disability progression becomes more based on non-inflammatory neurodegeneration than on inflammation.

PMID:35146841 | DOI:10.1111/ene.15280

Pediatr Int. 2022 Jan;64(1):e15033. doi: 10.1111/ped.15033.

ABSTRACT

BACKGROUND: Candida urinary tract infections (UTIs) are common nosocomial infections among critically ill patients hospitalized in pediatric intensive care Units (PICU). We aimed to report outcomes of critically ill pediatric patients who received micafungin for hospital acquired Candida UTIs. We analyzed treatment success rates and success rates among different Candida species.

METHODS: This retrospective cohort study included patients who received micafungin for Candida UTI as first choice in our PICU between January 2017 and July 2018. Data, including demographic and clinical features, were retrospectively collected from medical files of the patients. Treatment efficacy was defined as resolution of clinical symptoms and a negative culture for Candida at day 14 after initiation of micafungin treatment.

RESULTS: Twenty-four pediatric patients (median age 5.72 years, range, 2 months-16 years) were included in the present study. Fourteen (58.3%) patients had urinary catheters at the time of Candida isolation. Resolution of symptoms and a negative culture at day 3 of micafungin treatment were achieved in 17 (70.8%) and 14 (58.3%) patients, respectively. Moreover, 19 (79.2%) patients had a normal urine analysis and negative culture 14 days after initiation of micafungin treatment. Treatment responses did not statistically differ between Candida species.

CONCLUSIONS: Micafungin is safe and efficacious in critically ill pediatric patients with Candida UTIs. Its efficacy in our pediatric population was as comparable to that observed in adult studies, therefore, it should be considered as an effective therapeutic option in Candida UTIs of critically ill pediatric patients.

PMID:35146837 | DOI:10.1111/ped.15033

Stat Med. 2022 Feb 10. doi: 10.1002/sim.9333. Online ahead of print.

ABSTRACT

A practical limitation of cluster randomized controlled trials (cRCTs) is that the number of available clusters may be small, resulting in an increased risk of baseline imbalance under simple randomization. Constrained randomization overcomes this issue by restricting the allocation to a subset of randomization schemes where sufficient overall covariate balance across comparison arms is achieved. However, for multi-arm cRCTs, several design and analysis issues pertaining to constrained randomization have not been fully investigated. Motivated by an ongoing multi-arm cRCT, we elaborate the method of constrained randomization and provide a comprehensive evaluation of the statistical properties of model-based and randomization-based tests under both simple and constrained randomization designs in multi-arm cRCTs, with varying combinations of design and analysis-based covariate adjustment strategies. In particular, as randomization-based tests have not been extensively studied in multi-arm cRCTs, we additionally develop most-powerful randomization tests under the linear mixed model framework for our comparisons. Our results indicate that under constrained randomization, both model-based and randomization-based analyses could gain power while preserving nominal type I error rate, given proper analysis-based adjustment for the baseline covariates. Randomization-based analyses, however, are more robust against violations of distributional assumptions. The choice of balance metrics and candidate set sizes and their implications on the testing of the pairwise and global hypotheses are also discussed. Finally, we caution against the design and analysis of multi-arm cRCTs with an extremely small number of clusters, due to insufficient degrees of freedom and the tendency to obtain an overly restricted randomization space.

PMID:35146788 | DOI:10.1002/sim.9333

J Magn Reson Imaging. 2022 Feb 10. doi: 10.1002/jmri.28115. Online ahead of print.

ABSTRACT

BACKGROUND: Dual-venc 4D flow MRI, recently introduced for the assessment of intracranial hemodynamics, may provide a promising complementary approach to well-established tools such as transcranial Doppler ultrasound (TCD) and overcome some of their disadvantages. However, data comparing intracranial flow measures from dual-venc 4D flow MRI and TCD are lacking.

PURPOSE: To compare cerebral blood flow velocity measures derived from dual-venc 4D flow MRI and TCD.

STUDY TYPE: Prospective cohort.

SUBJECTS: A total of 25 healthy participants (56 ± 4 years old, 44% female).

FIELD STRENGTH/SEQUENCE: A 3 T/dual-venc 4D flow MRI using a time-resolved three-dimensional phase-contrast sequence with three-dimensional velocity encoding.

ASSESSMENT: Peak velocity measurements in bilateral middle cerebral arteries (MCA) were quantified from dual-venc 4D flow MRI and TCD. The MRI data were quantified by two independent observers (S.M and Y.M.) and TCD was performed by a trained technician (A.L.M.). We assessed the agreement between 4D flow MRI and TCD measures, and the interobserver agreement of 4D flow MRI measurements.

STATISTICAL TESTS: Peak velocity from MRI and TCD was compared using Bland-Altman analysis and coefficient of variance. Intraclass correlation coefficient (ICC) was used to assess MRI interobserver agreement. A P value < 0.05 was considered statistically significant.

RESULTS: There was excellent interobserver agreement in dual-venc 4D flow MRI-based measurements of peak velocity in bilateral MCA (ICC = 0.97 and 0.96 for the left and right MCA, respectively). Dual-venc 4D flow MRI significantly underestimated peak velocity in the left and right MCA compared to TCD (bias = 0.13 [0.59, -0.33] m/sec and 0.15 [0.47, -0.17] m/sec, respectively). The coefficient of variance between dual-venc 4D flow MRI and TCD measurements was 26% for the left MCA and 22% for the right MCA.

DATA CONCLUSION: There was excellent interobserver agreement for the assessment of MCA peak velocity using dual-venc 4D flow MRI, and ≤20% under-estimation compared with TCD.

EVIDENCE LEVEL: 3 TECHNICAL EFFICACY: Stage 2.

PMID:35146822 | DOI:10.1002/jmri.28115

Stat Med. 2022 Feb 10. doi: 10.1002/sim.9304. Online ahead of print.

ABSTRACT

Since its inception in 1969, the MSc in medical statistics program has placed a high priority on training students from Africa. In this article, we review how the program has shaped, and in turn been shaped by, two substantial capacity building initiatives: (a) a fellowship program, funded by the UK Medical Research Council, and run through the International Statistical Epidemiology Group at the LSHTM, and (b) the Sub-Saharan capacity building in Biostatistics (SSACAB) initiative, administered through the Developing Excellence in Leadership, Training and Science in Africa (DELTAS) program of the African Academy of Sciences. We reflect on the impact of both initiatives, and the implications for future work in this area.

PMID:35146786 | DOI:10.1002/sim.9304