scholarly journals Intraocular Lens Power, Myopia, and the Risk of Nd:YAG Capsulotomy after 15,375 Cataract Surgeries

2020 ◽  
Vol 9 (10) ◽  
pp. 3071
Author(s):  
Juha-Matti Lindholm ◽  
Ilkka Laine ◽  
Raimo Tuuminen
Keyword(s):  
Cataract Surgery ◽  
Proportional Hazards Model ◽  
Cox Regression ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Intraocular Lenses ◽  
Cumulative Probability ◽  
Cox Regression Analysis ◽  
Increased Risk ◽  
Hydrophobic Acrylic

The present study estimated the 5-year cumulative probability of Nd:YAG laser posterior capsulotomy according to the diopter power of implanted hydrophobic acrylic intraocular lenses (IOLs). Data were retrospectively collected of 15,375 eyes having cataract surgery and in-the-bag implantation of hydrophobic acrylic monofocal IOLs at the Ophthalmology Unit of Kymenlaakso Central Hospital, Kotka, Finland between the years 2007 and 2016. The cumulative probability of Nd:YAG capsulotomy was calculated by Kaplan–Meier estimates, and potential risk factors were analyzed using the Cox proportional hazards model. The 5-year cumulative probability of Nd:YAG capsulotomy after cataract surgery was 27.4% (95% confidence interval (CI) 22.9–32.6%) for low-diopter (5–16.5 D) IOLs, 14.6% (13.8–15.5%) for mid-diopter (17–24.5 D) IOLs, and 13.6% (11.7–15.6%) for high-diopter (25–30 D) IOLs. A multivariate Cox regression analysis showed that low-diopter IOLs (HR 1.76; 95% CI 1.38–2.25; p < 0.001) were associated with an increased risk of Nd:YAG capsulotomy compared to mid-diopter IOLs over the follow-up period after accounting for other predictors. Real-world evidence shows that low-diopter IOLs are associated with significantly higher risk of Nd:YAG capsulotomy within five years following implantation. Estimation should help in evaluating the risks of cataract surgery in myopic eyes.

scholarly journals Trajectories of Mediterranean Diet Adherence and Risk of Hypertension in China: Results from the CHNS Study, 1997–2011

Nutrients ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 2014 ◽  
Author(s):  
Min Gao ◽  
Fengbin Wang ◽  
Ying Shen ◽  
Xiaorou Zhu ◽  
Xing Zhang ◽  
...  
Keyword(s):  
Mediterranean Diet ◽  
Proportional Hazards Model ◽  
Cox Regression ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Nutrition Survey ◽  
Cox Regression Analysis ◽  
Incident Hypertension ◽  
Diet Adherence ◽  
Mediterranean Diet Adherence

Evidence indicates that longitudinal changes in dietary patterns may predict variations in blood pressure (BP) and risk of incident hypertension. We aimed to identify distinct trajectories in the levels of Mediterranean diet adherence (MDA) in China and explore their association with BP levels and hypertension risk using the China Health and Nutrition Survey 1997–2011 data. Three levels of MDA were constructed. The trajectories in these levels were constructed using group-based trajectory modeling. A Cox proportional hazards model was used to measure the association between MDA trajectory groups and the risk of incident hypertension after adjusting for covariates. Finally, 6586 individuals were included. Six distinct MDA trajectory groups were identified: persistently low and gradual decline; rapidly increasing and stabilized; persistently moderate; slightly increasing, steady, and acutely descending; slightly decreasing and acutely elevated; and persistently high. The systolic BP and diastolic BP were significantly lower in trajectory groups with rapidly increasing and stabilized MDA; slightly increasing, steady, and acutely descending MDA; and persistently high MDA. Cox regression analysis showed that the risks of developing hypertension were relatively lower in the group with slightly increasing, steady, and acutely descending MDA (hazard ratio (HR) = 0.17, 95% confidence interval (CI): 0.09–0.32) and the group with rapidly increasing and stabilized MDA (HR = 0.32, 95% CI: 0.23–0.42), but the risk was the highest in the trajectory with persistently moderate MDA (HR = 0.96, 95% CI: 0.84–1.08). In conclusion, MDA in China was categorized into six distinct trajectory groups. BP was relatively lower in trajectory groups with initially high or increasing MDA levels. Greater MDA was significantly associated with a lower risk of developing hypertension.

Genetic and nongenetic factors for contralateral progression of unilateral moyamoya disease: the first report from the SUPRA Japan Study Group

2021 ◽  
pp. 1-10
Author(s):  
Yohei Mineharu ◽  
Yasushi Takagi ◽  
Akio Koizumi ◽  
Takaaki Morimoto ◽  
Takeshi Funaki ◽  
...  
Keyword(s):  
Risk Factors ◽  
Moyamoya Disease ◽  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Cox Regression ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Multicenter Cohort Study ◽  
Cox Regression Analysis ◽  
Unilateral Moyamoya Disease

OBJECTIVE Although many studies have analyzed risk factors for contralateral progression in unilateral moyamoya disease, they have not been fully elucidated. The aim of this study was to examine whether genetic factors as well as nongenetic factors are involved in the contralateral progression. METHODS The authors performed a multicenter cohort study in which 93 cases with unilateral moyamoya disease were retrospectively reviewed. The demographic features, RNF213 R4810K mutation, lifestyle factors such as smoking and drinking, past medical history, and angiographic findings were analyzed. A Cox proportional hazards model was used to find risk factors for contralateral progression. RESULTS Contralateral progression was observed in 24.7% of cases during a mean follow-up period of 72.2 months. Clinical characteristics were not significantly different between 63 patients with the R4810K mutation and those without it. Cox regression analysis showed that the R4810K mutation (hazard ratio [HR] 4.64, p = 0.044), childhood onset (HR 7.21, p < 0.001), male sex (HR 2.85, p = 0.023), and daily alcohol drinking (HR 4.25, p = 0.034) were independent risk factors for contralateral progression. CONCLUSIONS These results indicate that both genetic and nongenetic factors are associated with contralateral progression of unilateral moyamoya disease. The findings would serve to help us better understand the pathophysiology of moyamoya disease and to manage patients more appropriately.

scholarly journals Simulation Extrapolation Method for Cox Regression Model with a Mixture of Berkson and Classical Errors in the Covariates using Calibration Data

2019 ◽  
Vol 15 (2) ◽  
Author(s):  
Jean de Dieu Tapsoba ◽  
Edward C. Chao ◽  
Ching-Yun Wang
Keyword(s):  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Cox Regression ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Classical Type ◽  
Calibration Data ◽  
Finite Sample ◽  
Cox Regression Analysis ◽  
Simulation Extrapolation

Abstract Many biomedical or epidemiological studies often aim to assess the association between the time to an event of interest and some covariates under the Cox proportional hazards model. However, a problem is that the covariate data routinely involve measurement error, which may be of classical type, Berkson type or a combination of both types. The issue of Cox regression with error-prone covariates has been well-discussed in the statistical literature, which has focused mainly on classical error so far. This paper considers Cox regression analysis when some covariates are possibly contaminated with a mixture of Berkson and classical errors. We propose a simulation extrapolation-based method to address this problem when two replicates of the mismeasured covariates are available along with calibration data for some subjects in a subsample only. The proposed method places no assumption on the mixture percentage. Its finite-sample performance is assessed through a simulation study. It is applied to the analysis of data from an AIDS clinical trial study.

scholarly journals Unplanned Reoperation After Trapeziometacarpal Arthroplasty: Rate, Reasons, and Risk Factors

Hand ◽  
2016 ◽  
Vol 12 (5) ◽  
pp. 446-452 ◽  
Author(s):  
Suzanne C. Wilkens ◽  
Zichao Xue ◽  
Jos J. Mellema ◽  
David Ring ◽  
Neal Chen
Keyword(s):  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Cox Regression ◽  
Persistent Pain ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Cox Regression Analysis ◽  
Factors Associated ◽  
Hazards Model ◽  
Kaplan Meier

Background: Trapeziometacarpal (TMC) arthritis is an expected part of ageing to which most patients adapt well. Patients who do not adapt to TMC arthritis may be offered operative treatment. The factors associated with reoperation after TMC arthroplasty are incompletely understood. The purpose of this study was to determine the rate of, the underlying reasons for, and the factors associated with unplanned reoperation after TMC arthroplasty. Methods: In this retrospective study, we included all adult patients who had TMC arthroplasty for TMC arthritis at 1 of 3 large urban area hospitals between January 2000 and December 2009. Variables were inserted into a multivariable Cox proportional hazards model to determine factors associated with unplanned reoperation, and the Kaplan-Meier curve was used to estimate and describe the probability of unplanned reoperation over time. Results: Among 458 TMC arthroplasties, 19 (4%) had an unplanned reoperation; 16 of 19 (84%) for persistent pain and two-thirds within the first year. The multivariate Cox regression analysis showed that unplanned reoperation was independently associated with younger age, surgeon inexperience, and index procedure type. Conclusions: Surgeons should be aware as well as patients should be informed that as many as 4% are offered or request a second surgery, usually for persistent pain and often within the 1-year window when additional improvement is anticipated.

Correlation between baseline variables and survival in the radium-223 dichloride (Ra-223) phase III ALSYMPCA trial with attention to total ALP changes.

2013 ◽  
Vol 31 (15_suppl) ◽  
pp. 5080-5080 ◽  
Author(s):  
A. Oliver Sartor ◽  
Roy Amariglio ◽  
Scott Wilhelm ◽  
Jose E. Garcia-Vargas ◽  
C. Gillies O'Bryan-Tear ◽  
...  
Keyword(s):  
Proportional Hazards Model ◽  
Cox Regression ◽  
Performance Status ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Phase Iii ◽  
Castration Resistant Prostate Cancer ◽  
Risk Of Death ◽  
Radium 223 ◽  
Increased Risk

5080 Background: In patients (pts) with castration-resistant prostate cancer and bone metastases (mCRPC), total ALP (tALP) has been shown to be a prognostic marker for overall survival (OS) (Cook 2006). Here the prognostic value of tALP and other baseline clinical variables in Ra-223 pts is presented, along with the initial results of an exploratory analysis of changes in tALP seen with Ra-223. Methods: Study population included 921 pts (intent-to-treat population) from the ALSYMPCA trial. The Cox proportional hazards model was used to evaluate the prognostic potential of tALP and other baseline variables (albumin, Hb, LDH, ECOG performance status, PSA, and age). Log transformation was done for baseline variables (tALP, PSA, and LDH) with heavily skewed distributions. Baseline variables were assessed for interaction with treatment. To determine changes in tALP from baseline at 12 wk, 708 pts who had tALP measurements at both baseline and 12 wk were included. Results: The baseline variables in the Table were significantly associated with OS. Hb was not a significant factor when adjusting for all other covariates and was therefore removed from the final Cox regression model. No significant treatment-by-covariate interactions were detected. After controlling for other variables, higher baseline tALP was significantly associated with an increased risk of death (p < 0.0001). At 12 wk, a decline in tALP relative to baseline was seen in 87% (433/497) of Ra-223 pts, compared to 23% (49/211) of placebo pts. The mean percentage change from baseline in tALP at 12 wk was a 32% decline for Ra-223 pts, in contrast to a 37% increase for placebo pts (p< 0.001). Conclusions: In mCRPC pts, higher baseline levels of tALP were associated with an increased risk of death. With the majority of Ra-223 pts experiencing a decline in tALP at 12 wk, and the marked mean percentage tALP decline in these pts, further analysis to determine a correlation between tALP dynamics and survival is warranted. Clinical trial information: NCT00699751. [Table: see text]

scholarly journals DIRC3 and close to NABP1 Genetics Polymorphisms correlated with Prognostic Survival in Patients with Laryngeal Squamous Cell Carcinoma

2016 ◽  
Author(s):  
Zhen Shen ◽  
Wanli Ren ◽  
Yanxia Bai ◽  
Zhengshuai Chen ◽  
Jingjie Li ◽  
...  
Keyword(s):  
Squamous Cell Carcinoma ◽  
Cell Carcinoma ◽  
Squamous Cell ◽  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Laryngeal Squamous Cell Carcinoma ◽  
Cox Regression ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Cox Regression Analysis

Laryngeal squamous cell carcinoma (LSCC) is one of the most common and aggressive malignancies in the upper digestive tract that has a high mortality rate and a poor prognosis. Prognostic factors were determined through multivariate Cox regression analysis. The overall survival rates were calculated by the Kaplan-Meier method. The SPSS statistical software package version 17.0 (SPSS Inc., Chicago, IL, USA) was used for all analyses. Median follow-up was 38 (range 3-122) months and the median survival time was 48 months. We adjusted to confounding factors (total laryngectomy, poor differentiation, T3-T4 stage, N1-N2 stage, III-IV TNM stage) into multivariate Cox proportional hazards model, we confirmed rs11903757 GT genotype (HR = 2.036; 95% CI, 1.071 - 3.872; p = 0.030) and rs966423 TT genotype (HR = 11.677; 95% CI, 3.901 - 34.950; p = 0.000) were significantly correlated with prognostic survival of patients with LSCC compared with rs11903757 TT genotype and rs966423 CC genotype, respectively. Our research provided new evidence for patients with LSCC, it seemed to be the first that demonstrated rs11903757 GT genotype on chromosome 2q32.3 close to NABP1 and rs966423 TT genotype in the intron region of DIRC3 on chromosome 2q35 predict poor prognostic survival in patients with LSCC.

scholarly journals Elevated plasma growth and differentiation factor 15 predicts incident anemia in older adults aged 60 years and older

2020 ◽  
Author(s):  
Yuko Yamaguchi ◽  
Marta Zampino ◽  
Toshiko Tanaka ◽  
Stefania Bandinelli ◽  
Yusuke Osawa ◽  
...  
Keyword(s):  
Older Adults ◽  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Differentiation Factor ◽  
Hazards Model ◽  
Increased Risk ◽  
The Relationship

Abstract Background Anemia is common in older adults and associated with greater morbidity and mortality. The causes of anemia in older adults have not been completely characterized. Although elevated circulating growth and differentiation factor 15 (GDF-15) has been associated with anemia in older adults, it is not known whether elevated GDF-15 predicts the development of anemia. Methods We examined the relationship between plasma GDF-15 concentrations at baseline in 708 non-anemic adults, aged 60 years and older, with incident anemia during 15 years of follow-up among participants in the Invecchiare in Chianti (InCHIANTI) Study. Results During follow-up, 179 (25.3%) participants developed anemia. The proportion of participants who developed anemia from the lowest to highest quartile of plasma GDF-15 was 12.9%, 20.1%, 21.2%, and 45.8%, respectively. Adults in the highest quartile of plasma GDF-15 had an increased risk of developing anemia (Hazards Ratio 1.15, 95% Confidence Interval 1.09, 1.21, P&lt;.0001) compared to those in the lower three quartiles in a multivariable Cox proportional hazards model adjusting for age, sex, serum iron, soluble transferrin receptor, ferritin, vitamin B12, congestive heart failure, diabetes mellitus, and cancer. Conclusions Circulating GDF-15 is an independent predictor for the development of anemia in older adults.

scholarly journals Premature Ventricular Complexes on Screening Electrocardiogram and Risk of Ischemic Stroke

Stroke ◽  
2015 ◽  
Vol 46 (5) ◽  
pp. 1365-1367 ◽  
Author(s):  
Sunil K. Agarwal ◽  
Jennifer Chao ◽  
Frederick Peace ◽  
Suzanne E. Judd ◽  
Brett Kissela ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Ischemic Stroke ◽  
Racial Differences ◽  
Proportional Hazards Model ◽  
Geographic Region ◽  
Left Ventricular ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Premature Ventricular Complexes ◽  
Increased Risk

Background and Purpose— Premature ventricular complexes (PVCs) detected from long-term ECG recordings have been associated with an increased risk of ischemic stroke. Whether PVCs seen on routine ECG, commonly used in clinical practice, are associated with an increased risk of ischemic stroke remains unstudied. Methods— This analysis included 24 460 participants (aged, 64.5+9.3 years; 55.1% women; 40.0% blacks) from the Reasons for Geographic and Racial Differences in Stroke (REGARDS) study who were free of stroke at the time of enrollment. PVCs were ascertained from baseline ECG (2003–2007), and incident stroke cases through 2011 were confirmed by an adjudication committee. Results— A total of 1415 (5.8%) participants had at least 1 PVC at baseline, and 591 developed incident ischemic stroke during an average (SD) follow-up of 6.0 (2.0) years. In a cox proportional hazards model adjusted for age, sex, race, geographic region, education, previous heart disease, systolic blood pressure, blood pressure–lowering medications, current smoking, diabetes mellitus, left ventricular hypertrophy by ECG, and aspirin use and warfarin use, the presence of PVCs was associated with 38% increased risk of ischemic stroke (hazard ratio [95% confidence interval], 1.38 [1.05–1.81]). Conclusions— PVCs are common on routine screening ECGs and are associated with an increased risk of ischemic stroke.

scholarly journals Blood eosinophils on hospital admission for COPD exacerbation do not predict the recurrence of moderate and severe relapses

2021 ◽  
Vol 7 (1) ◽  
pp. 00543-2020
Author(s):  
Balázs Csoma ◽  
András Bikov ◽  
Ferenc Tóth ◽  
György Losonczy ◽  
Veronika Müller ◽  
...  
Keyword(s):  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Forced Expiratory Volume ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Full Blood Count ◽  
Rank Test ◽  
Severe Exacerbation ◽  
Increased Risk ◽  
Exacerbation Of Copd

Background and objectiveThe relationship between hospitalisation with an eosinophilic acute exacerbation of COPD (AE-COPD) and future relapses is unclear. We aimed to explore this association by following 152 patients for 12 months after hospital discharge or until their first moderate or severe flare-up.MethodsPatients hospitalised with AE-COPD were divided into eosinophilic and non-eosinophilic groups based on full blood count results on admission. All patients were treated with a course of systemic corticosteroid. The Cox proportional hazards model was used to study the association with the time to first re-exacerbation; a generalised linear regression model was applied to identify clinical variables related to the recurrence of relapses.ResultsWe did not find a difference in the time to the next moderate or severe exacerbation between the eosinophilic (≥2% of total leukocytes and/or ≥200 eosinophils·µL−1, n=51, median (interquartile range): 21 (10–36) weeks) and non-eosinophilic groups (n=101, 17 (9–36) weeks, log-rank test: p=0.63). No association was found when other cut-off values (≥3% of total leukocytes and/or ≥300 eosinophils·µL−1) were used for the eosinophilic phenotype. However, the higher number of past severe exacerbations, a lower forced expiratory volume in 1 s (FEV1) at discharge and higher pack-years were related to shorter exacerbation-free time. According to a subgroup analysis (n=73), 48.1% of patients with initial eosinophilic exacerbations had non-eosinophilic relapses on readmission.ConclusionsOur data do not support an increased risk of earlier recurring moderate or severe relapses in patients hospitalised with eosinophilic exacerbations of COPD. Eosinophilic severe exacerbations present a variable phenotype.

Abstract WP79: Choice Of Treatment And Effect On Hemorrhage Rates Of Unruptured Intracranial Aneurysms

Stroke ◽  
2013 ◽  
Vol 44 (suppl_1) ◽  
Author(s):  
James Torner ◽  
Jie Zhang ◽  
David Piepgras ◽  
John Huston ◽  
Irene Meissner ◽  
...  
Keyword(s):  
Intracranial Aneurysms ◽  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Interventional Procedure ◽  
Careful Consideration ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Unruptured Intracranial Aneurysms ◽  
Increased Risk

INTRODUCTION: The decision regarding whether to perform an interventional procedure as a strategy to prevent hemorrhage of an unruptured intracranial aneurysm (UIA) requires careful consideration of procedural risk and the UIA natural history. No randomized trial data are available. The International Study of Unruptured Intracranial Aneurysms (ISUIA) included a prospective cohort, examining hemorrhage risk and treatment risk. Hypothesis: The purpose of this analysis was to compare the factors related to treatment selection and determination of the number of hemorrhages prevented. Methods: Patients were allocated into the initial treatment and untreated cohorts based upon observation or treatment practices in 61 centers from 1991-1998. 1691 patients were in the observational cohort, 471 were in the endovascular cohort and 1917 patients were in the surgical cohort. The cohorts were followed for a median follow-up of 9.2 years. Outcomes were determined prospectively and with central review. The data were grouped together and analyzed to determine treatment decisions. A Cox proportional hazards model predicting hemorrhage developed in the observation cohort and was applied to the surgery and endovascular cohorts across the follow-up period. Results: Significant baseline variable differences between treated and observed patients were aneurysm size, symptoms, age, prior SAH group, geographical region, treatment percentage, aneurysm daughter sacs or multiple lobes, and history of hypertension, smoking and myocardial infarction. Aneurysm site and family history were not significant. Site, size, and aspirin use were significant predictors of hemorrhage. Long-term the predicted hemorrhage rates were 6.7% at 5 years and 8.0% at 10 years in the surgery group and 8.1% and 9.6% for the endovascular group, respectively. For comparison the rates in the observed cohort were 4.1% and 4.8%, respectively. Conclusions: Decisions for treatment are influenced by patient characteristics such as age and medical history, aneurysm characteristics such as size and morphology and center and regional practices. Patients in the treated cohorts were at moderately increased risk for hemorrhage compared to those in the observed cohort.

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