matched pair analysis
Recently Published Documents





2022 ◽  
Vol 11 (2) ◽  
pp. 422
Daniel Dubinski ◽  
Sae-Yeon Won ◽  
Bedjan Behmanesh ◽  
Max Dosch ◽  
Viktoria Puchinin ◽  

Background: Glioblastoma (GBM) patients are at particularly high risk for thrombotic complications. In the event of a postoperative pulmonary embolism, therapeutic anticoagulation (tAC) is indispensable. The impact of therapeutic anticoagulation on recurrence pattern in GBM is currently unknown. Methods: We conducted a matched-pair cohort analysis of 57 GBM patients with or without tAC that were matched for age, sex, gross total resection and MGMT methylation status in a ratio of 1:2. Patients’ characteristics and clinical course were evaluated using medical charts. MRI characteristics were evaluated by two independent authors blinded to the AC status. Results: The morphologic MRI appearance in first GBM recurrence showed a significantly higher presence of multifocal, midline crossing and sharp demarcated GBM recurrence patterns in patients with therapeutic tAC compared to the matched control group. Although statistically non-significant, the therapeutic tAC cohort showed increased survival. Conclusion: Therapeutic anticoagulation induced significant morphologic changes in GBM recurrences. The underlying pathophysiology is discussed in this article but remains to be further elucidated.

2022 ◽  
pp. 175857322110654
Hasani W Swindell ◽  
Alirio J deMeireles ◽  
Jack R Zhong ◽  
Elise C. Bixby ◽  
Bryan M Saltzman ◽  

Background There is minimal work defining the economic impact of resident participation in shoulder arthroplasty. Thus, this study quantified the opportunity cost of resident participation in total shoulder arthroplasty (TSA) and hemiarthroplasty (HA) by determining differences in operative time, relative value units (RVUs)/hour, and RVUs/case. Methods A retrospective analysis of shoulder arthroplasty procedures were identified from the ACS-NSQIP database from 2006 to 2014 using CPT codes. Demographic, comorbidity, preoperative laboratory data and surgical procedure were used to develop matched cohorts. Mean differences in operative time, RVUs/case and RVUs/hour between attending-only (AO) cases and cases with resident involvement (RI) were examined. Cost analysis was performed to identify differences in RVUs generated per hour in dollars/case. Results A total of 1786 AO and 1102 RI cases were identified. With the exception of PGY-3 and PGY-4 cases, RI cases had lower mean operative times compared to AO cases. The cost of RI was highest for PGY-3 ($199.87 per case) and PGY-4 ($9 .2 9) residents with all other postgraduate years providing a cost reduction. Discussion Involvement of residents was associated with shorter operative times leading to a savings of $29.64 per case. Involvement of intermediate-level (PGY-3) residents were associated with increased costs that ultimately decreased as residents became more senior.

Atul F. Kamath ◽  
Sridhar M. Durbhakula ◽  
Trevor Pickering ◽  
Nathan L. Cafferky ◽  
Trevor G. Murray ◽  

BMJ Open ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. e056940
Nico Gross ◽  
Lucas M Bachmann ◽  
Meriam Islam ◽  
Livia Faes ◽  
Martin K Schmid ◽  

ObjectiveWe compared patients with neovascular age-related macular degeneration (nvAMD), diabetic macular oedema (DMO) and other macular pathologies testing their vision with the hyperacuity home-monitoring app Alleye to patients not performing home-monitoring regarding clinical outcomes and clinical management.DesignMatched-pair analysis.SettingRetina Referral Centre, Switzerland.ParticipantsFor each eye using Alleye, we matched 2–4 controls not using home-monitoring based on age, gender, number of previous intravitreal injections (IVI), best corrected visual acuity (BCVA) (Early Treatment Diabetic Retinopathy Study letters), central macular thickness (CRT) and time point of enrolment, using the Mahalanobis distance matching algorithm. We included 514 eyes (288 patients); 107 eyes with nvAMD using home monitoring and 218 controls not using home monitoring, 25 eyes with DMO (n=52 controls) and 40 eyes with miscellaneous conditions (n=72 controls). 173 eyes (33.7%) received no IVI during follow-up.Main outcome measuresImprovement of ≥5 letters, number of injection visits and treatment retention after correcting for differences in baseline characteristics with multivariate analyses.ResultsThe mean follow-up duration was 809 days (range 147–1353) and the mean number of IVI/year among treated eyes was 6.7 (SD 3.1). Mean age at baseline was 70.4 years (SD 10.9), BCVA was 77.6 letters (SD 11.6) and CRT was 263.6 µm (SD 86.7) and was similar between patients using and not using home monitoring. In multivariate analyses, patients using home monitoring had a higher chance to improve visual acuity by ≥5 letters (OR 1.67 (95% CI 1.01 to 2.76; p=0.044)) than controls. Treated eyes using home monitoring had less injection visits/year (−0.99 (95% CI −1.59 to −0.40; p=0.001)) and a longer treatment retention +69.2 days (95% CI 2.4 to 136.0; p=0.042). These effects were similar across retinal pathologies.ConclusionsThis data suggest that patients capable of performing mobile hyperacuity home monitoring benefit in terms of visual acuity and discontinue treatment less often than patients not using home monitoring.

2021 ◽  
Vol 4 (1) ◽  
Ye Sun ◽  
Giacomo Livan ◽  
Athen Ma ◽  
Vito Latora

AbstractInterdisciplinary research is on the rise globally. Yet, several studies have shown that it often achieves lower impact compared to more specialized work, and is less likely to attract funding. Here, we seek to reconcile such evidence by analyzing 44,419 research grants awarded by the research councils in the UK. We find that researchers with an interdisciplinary funding track record dominate the network of academic collaborations, both in terms of centrality and knowledge brokerage, but such a competitive advantage does not translate into immediate return. Our results based on a matched pair analysis show that interdisciplinary researchers achieve lower impact with their publications in the short run; however, they eventually outperform their specialized counterparts in funding performance, both in terms of volume and value. These findings suggest that pursuing an interdisciplinary career may require perseverance to overcome extra challenges, but can pave the way for a more successful endeavor.

2021 ◽  
Vol 8 ◽  
Florestan J. Koll ◽  
Eva Meisenzahl ◽  
Bernhard Haller ◽  
Philipp Maisch ◽  
Florian Kirchhoff ◽  

Purpose: Discordance between pre-operative biopsy and final pathology for Upper Tract Urothelial Carcinoma (UTUC) is high and optimal management remains controversial. The aim of this study is to evaluate the accuracy of pre-operative biopsy, to identify prognostic factors and to evaluate the effect of adjuvant chemotherapy on survival and oncologic outcome in UTUC.Methods: We analyzed records of patients receiving surgical treatment for UTUC. Pathology of pre-operative biopsy was compared to surgical specimen. We used Kaplan-Meier method to estimate survival probabilities and Cox's proportional hazards models to estimate the association between covariates and event times. Primary endpoint was overall survival (OS). A matched-pair analysis was performed to evaluate the effect of adjuvant chemotherapy.Results: 151 patients underwent surgical treatment (28% open, 36% laparoscopic, 17% robotic radical nephroureterectomy; 14% segmental ureteral resections and 5% palliative nephrectomy) for UTUC and were included in the analysis. Upstaging from <pT1 in endoscopic biopsy to ≥pT1 in final pathology occurred in 61% of patients and upgrading from low-grade to high-grade occurred in 30% of patients. Five-year OS was 59.5%. In the univariate Cox-regression model pathological stage, grade, lymphovascular invasion and positive surgical margins were associated with OS. Matched pair analysis for stage (<pT3; ≥pT3; pN+) and age revealed a significant survival benefit for adjuvant chemotherapy (HR 0.40, 0.14–0.77, p < 0.018) in this cohort.Conclusion: UTUC is often underestimated in pre-operative biopsy, and it is associated with significant mortality. Pathological stage and grade, lymphovascular invasion and lymph node metastases are predictors of oncologic outcome and survival.

Sign in / Sign up

Export Citation Format

Share Document