scholarly journals Propensity score weighting for causal subgroup analysis

2021 ◽  
Author(s):  
Siyun Yang ◽  
Elizabeth Lorenzi ◽  
Georgia Papadogeorgou ◽  
Daniel M. Wojdyla ◽  
Fan Li ◽  
...  
Keyword(s):  
Propensity Score ◽  
Subgroup Analysis ◽  
Propensity Score Weighting

scholarly journals Estimating the causal effects of modifiable, non-genetic factors on Huntington disease progression using propensity score weighting

2021 ◽  
Vol 83 ◽  
pp. 56-62
Author(s):  
Beth Ann Griffin ◽  
Marika Suttorp Booth ◽  
Monica Busse ◽  
Edward J. Wild ◽  
Claude Setodji ◽  
...  
Keyword(s):  
Propensity Score ◽  
Disease Progression ◽  
Huntington Disease ◽  
Genetic Factors ◽  
Causal Effects ◽  
Propensity Score Weighting

Association of Body Mass Index With Clinical Outcomes in Patients With Heart Failure With Reduced Ejection Fraction Treated With Sacubitril/Valsartan

2021 ◽  
pp. 107424842110244
Author(s):  
Kazuhiko Kido ◽  
Christopher Bianco ◽  
Marco Caccamo ◽  
Wei Fang ◽  
George Sokos
Keyword(s):  
Heart Failure ◽  
Body Mass Index ◽  
Propensity Score ◽  
Ejection Fraction ◽  
Clinical Outcomes ◽  
Body Mass ◽  
Normal Weight ◽  
Reduced Ejection Fraction ◽  
Propensity Score Weighting ◽  
Patients With Heart Failure

Background: Only limited data are available that address the association between body mass index (BMI) and clinical outcomes in patients with heart failure with reduced ejection fraction who are receiving sacubitril/valsartan. Methods: We performed a retrospective multi-center cohort study in which we compared 3 body mass index groups (normal, overweight and obese groups) in patients with heart failure with reduced ejection fraction receiving sacubitril/valsartan. The follow-up period was at least 1 year. Propensity score weighting was performed. The primary outcomes were hospitalization for heart failure and all-cause mortality. Results: Of the 721 patients in the original cohort, propensity score weighting generated a cohort of 540 patients in 3 groups: normal weight (n = 78), overweight (n = 181), and obese (n = 281). All baseline characteristics were well-balanced between 3 groups after propensity score weighting. Among our results, we found no significant differences in hospitalization for heart failure (normal weight versus overweight: average hazard ratio [AHR] 1.29, 95% confidence interval [CI] = 0.76-2.20, P = 0.35; normal weight versus obese: AHR 1.04, 95% CI = 0.63-1.70, P = 0.88; overweight versus obese groups: AHR 0.81, 95% CI = 0.54-1.20, P = 0.29) or all-cause mortality (normal weight versus overweight: AHR 0.99, 95% CI = 0.59-1.67, P = 0.97; normal weight versus obese: AHR 0.87, 95% CI = 0.53-1.42, P = 0.57; overweight versus obese: AHR 0.87, 95% CI = 0.58-1.32, P = 0.52). Conclusion: We identified no significant associations between BMI and clinical outcomes in patients diagnosed with heart failure with a reduced ejection fraction who were treated with sacubitril/valsartan. A large-scale study should be performed to verify these results.

scholarly journals Varicella zoster virus infections increase the risk of disease flares in patients with SLE: a matched cohort study

2019 ◽  
Vol 6 (1) ◽  
pp. e000339 ◽  
Author(s):  
Fangfang Sun ◽  
Yi Chen ◽  
Wanlong Wu ◽  
Li Guo ◽  
Wenwen Xu ◽  
...  
Keyword(s):  
Propensity Score ◽  
Varicella Zoster Virus ◽  
Cox Regression ◽  
Control Period ◽  
Cox Regression Analysis ◽  
Varicella Zoster ◽  
Propensity Score Weighting ◽  
Kaplan Meier ◽  
Increased Risk ◽  
Risk Of Disease

ObjectiveTo explore whether varicella zoster virus (VZV) infection could increase the risk of disease flares in patients with SLE.MethodsPatients who had VZV reactivations between January 2013 and April 2018 were included from the SLE database (n=1901) of Shanghai Ren Ji Hospital, South Campus. Matched patients with SLE were selected as background controls with a 3:1 ratio. Patients with SLE with symptomatic bacterial infections of the lower urinary tract (UTI) were identified as infection controls. Baseline period and index period were defined as 3 months before and after infection event, respectively. Control period was the following 3 months after the index period. Flare was defined by SELENA SLEDAI Flare Index. Kaplan-Meier analysis, Cox regression model and propensity score weighting were applied.ResultsPatients with VZV infections (n=47), UTI controls (n=28) and matched SLE background controls (n=141) were included. 16 flares (34%) in the VZV group within the index period were observed, as opposed to only 7.1% in UTI controls and 9.9% in background controls. Kaplan-Meier curve revealed that patients with a VZV infection had a much lower flare-free survival within the index period compared with the controls (p=0.0003). Furthermore, after adjusting for relevant confounders including baseline disease activity and intensity of immunosuppressive therapy, Cox regression analysis and propensity score weighting confirmed that VZV infection within 3 months was an independent risk factor for SLE flares (HR 3.70 and HR 4.16, respectively).ConclusionsIn patients with SLE, recent VZV infection within 3 months was associated with increased risk of disease flares.

scholarly journals Dialyzer Classification and Mortality in Hemodialysis Patients: A 3-Year Nationwide Cohort Study

2021 ◽  
Vol 8 ◽  
Author(s):  
Masanori Abe ◽  
Ikuto Masakane ◽  
Atsushi Wada ◽  
Shigeru Nakai ◽  
Kosaku Nitta ◽  
...  
Keyword(s):  
Cohort Study ◽  
Propensity Score ◽  
Propensity Score Matching ◽  
Subgroup Analysis ◽  
Hemodialysis Patients ◽  
Type I ◽  
High Flux ◽  
Type Iv ◽  
Japanese Classification ◽  
Type V

Background: Dialyzers are classified as low-flux, high-flux, and protein-leaking membrane dialyzers internationally and as types I, II, III, IV, and V based on β2-microglobulin clearance rate in Japan. Type I dialyzers correspond to low-flux membrane dialyzers, types II and III to high-flux membrane dialyzers, and types IV and V to protein-leaking membrane dialyzers. Here we aimed to clarify the association of dialyzer type with mortality.Methods: This nationwide retrospective cohort study analyzed data from the Japanese Society for Dialysis Therapy Renal Data Registry from 2010 to 2013. We enrolled 238,321 patients on hemodialysis who were divided into low-flux, high-flux, and protein-leaking groups in the international classification and into type I to V groups in the Japanese classification. We assessed the associations of each group with 3-year all-cause mortality using Cox proportional hazards models and performed propensity score matching analysis.Results: By the end of 2013, 55,308 prevalent dialysis patients (23.2%) had died. In the international classification subgroup analysis, the hazard ratio (95% confidence interval) was significantly higher in the low-flux group [1.12 (1.03–1.22), P = 0.009] and significantly lower in the protein-leaking group [0.95 (0.92–0.98), P = 0.006] compared with the high-flux group after adjustment for all confounders. In the Japanese classification subgroup analysis, the hazard ratios were significantly higher for types I [1.10 (1.02–1.19), P = 0.015] and II [1.10 (1.02–1.39), P = 0.014] but significantly lower for type V [0.91 (0.88–0.94), P < 0.0001] compared with type IV after adjustment for all confounders. These significant findings persisted after propensity score matching under both classifications.Conclusions: Hemodialysis using protein-leaking dialyzers might reduce mortality rates. Furthermore, type V dialyzers are superior to type IV dialyzers in hemodialysis patients.

Impact of resection and ablation for single hypovascular hepatocellular carcinoma ≤2 cm analysed with propensity score weighting

2018 ◽  
Vol 38 (3) ◽  
pp. 484-493 ◽  
Author(s):  
Kenichi Takayasu ◽  
Shigeki Arii ◽  
Michiie Sakamoto ◽  
Yutaka Matsuyama ◽  
Masatoshi Kudo ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Propensity Score ◽  
Propensity Score Weighting

Effect of the Timing of Frozen Embryo Transfer on Pregnancy Outcomes in High Ovarian Response Patients Undergoing Freeze-All Strategy

2020 ◽  
Author(s):  
Na Zuo ◽  
Yingzhuo Gao ◽  
Ningning Zhang ◽  
Da Li ◽  
Xiuxia Wang
Keyword(s):  
Propensity Score ◽  
Embryo Transfer ◽  
Subgroup Analysis ◽  
Pregnancy Outcomes ◽  
Ovarian Response ◽  
Frozen Embryo Transfer ◽  
Matched Cohort ◽  
Entire Cohort ◽  
Long Acting ◽  
Long Protocol

Abstract Background: Frozen embryo transfer (FET) can greatly improve the pregnancy outcomes for high ovarian response (HOR) population. However, it is not known whether the impaired endometrial receptivity derived from controlled ovarian hyperstimulation (COH) can be fully recovered in the first menstrual cycle after oocyte retrieval, and whether the timing of FET is a risk factor on pregnancy outcomes in HOR population undergoing freeze-all strategy.Methods: A retrospective cohort study to compare the pregnancy outcomes of the immediate and delayed FET groups in HOR population undergoing freeze-all strategy. Propensity score matching was used to make the potential risk factors of the immediate and delayed FET groups comparable. Multivariable regression analysis was used to study the effect of the timing of FET on pregnancy outcomes in the entire cohort and propensity score-matched cohort, even in different COH protocol cohorts as subgroup analysis.Results: We showed that the immediate FET group were no worse than delayed FET group in the entire cohort [clinical pregnancy rate (CPR), adjusted odd ratio (OR), 0.942, 95% confidence interval (CI), 0.784-1.133; spontaneous abortion rate (SAR), adjusted OR, 1.118, 95% Cl (0.771-1.623); live birth rate (LBR), adjusted OR, 1.060, 95% Cl (0.886-1.267)]. The same results were obtained by χ2 test in the propensity score-matched cohort (CPR, 60.5% versus 63.5%; SAR, 11.6% versus 12.3%; LBR, 48% versus 49.3%) (P > 0.05). Subgroup analysis indicated that pregnancy outcomes of immediate FET were non-inferior to delayed FET in short-acting gonadotropin-releasing hormone agonist (GnRH-a) long protocol (P > 0.05). The SAR of the immediate FET group were lower than that of the delayed FET group in GnRH antagonist protocol (adjusted OR, 0.646, 95% CI, 0.432-0.966) and long-acting GnRH-a long protocol (adjusted OR, 0.375, 95% CI, 0.142-0.990) (P < 0.05), no differences were observed in CPR and LBR (P > 0.05).Conclusions: These findings indicate that immediate FET might not affect pregnancy outcomes in HOR patients undergoing freeze-all strategy. Delaying FET could increase the SAR in GnRH-ant and long-acting GnRH-a long protocols.

Clinical Significance of 4L Lymph Node Dissection in Left Lung Cancer

2018 ◽  
Vol 36 (29) ◽  
pp. 2935-2942 ◽  
Author(s):  
Ya-Nan Wang ◽  
Shuang Yao ◽  
Chang-Li Wang ◽  
Mei-Shuang Li ◽  
Lei-Na Sun ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Lymph Node ◽  
Propensity Score ◽  
Univariate Analysis ◽  
Left Lung ◽  
Disease Free Survival ◽  
Hazard Ratio ◽  
Favorable Effect ◽  
Prognostic Impact ◽  
Propensity Score Weighting

Purpose To investigate the prognostic impact of 4L lymph node (LN) dissection in left lung cancer and to analyze the relative risk factors for 4L LN metastasis. Patients and Methods We retrospectively collected data from 657 patients with primary left lung cancer who underwent surgical pulmonary resection from January 2005 to December 2009. One hundred thirty-nine patients underwent 4L LN dissection (4LD+ group); the other 518 patients did not receive 4L LN dissection (4LD− group). Propensity score weighting was applied to reduce the effects of observed confounding between the two groups. Study end points were disease-free survival (DFS) and overall survival (OS). Results The metastasis rate of station 4L was 20.9%, which was significantly higher than those of station 7 (14.0%; P = .048) and station 9 (9.8%; P < .001). Station 4L metastasis was associated with most other LN station metastases in univariate analysis, but only station 10 LN metastasis was an independent risk factor for 4L LN metastasis (odds ratio, 0.253; 95% CI, 0.109 to 0.588; P = .001) in multivariate logistic analysis. The 4LD+ group had a significantly better survival than the 4LD− group (5-year DFS, 54.8% v 42.7%; P = .0376; 5-year OS, 58.9% v 47.2%; P = .0200). After allowing potential confounders in multivariate survival analysis, dissection of 4L LN retained its independent favorable effect on DFS (hazard ratio, 1.502; 95% CI, 1.159 to 1.947; P = .002) and OS (hazard ratio, 1.585; 95% CI, 1.222 to 2.057; P = .001). Propensity score weighting further confirmed that the 4LD+ group had a more favorable DFS ( P = .0014) and OS ( P < .001) than the 4LD− group. Conclusion Station 4L LN involvement is not rare in left lung cancer, and dissection of the 4L LN station seems to be associated with a more favorable prognosis as compared with those who did not undergo this dissection.

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