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Dive into the research topics where Siting Zhou is active.

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Featured researches published by Siting Zhou.


Value in Health | 2015

Asthma and Chronic Obstructive Pulmonary Disease Overlap Syndrome: Doubled Costs Compared with Patients with Asthma Alone☆

Maria Gerhardsson de Verdier; Maria Andersson; David M. Kern; Siting Zhou; Ozgur Tunceli

BACKGROUND Patients with asthma and chronic obstructive pulmonary disease (COPD) overlap syndrome (ACOS) have more rapid disease progression and more exacerbations than do those with either condition alone. Little research has been performed, however, in these patients. OBJECTIVE The objective was to summarize the health care utilization, costs, and comorbidities of patients with uncontrolled asthma and patients with ACOS. METHODS This retrospective analysis used medical and pharmacy claims from large commercial health plans. The study included patients 6 years or older with a diagnosis of asthma and one or more asthma exacerbation (index event). Patients were classified as having asthma alone or ACOS, and the two groups were matched for age, sex, region, index year, index month, and health plan type. Outcomes included rates of comorbid disease, health care utilization, and costs during the 12 months before and after the index exacerbation. RESULTS Among the matched patients with asthma (6,505 ACOS; 26,060 without COPD), mean annual all-cause health care costs were twice as high as for patients with ACOS (


Journal of the American Heart Association | 2017

Initiation Patterns of Statins in the 2 Years After Release of the 2013 American College of Cardiology/American Heart Association (ACC/AHA) Cholesterol Management Guideline in a Large US Health Plan

Temitope Olufade; Siting Zhou; Deborah Anzalone; David M. Kern; Ozgur Tunceli; Mark J. Cziraky; Vincent J. Willey

22,393 vs.


The Journal of Allergy and Clinical Immunology: In Practice | 2014

Comparative Effectiveness of Budesonide-Formoterol Combination and Fluticasone-Salmeterol Combination for Asthma Management: A United States Retrospective Database Analysis

Ozgur Tunceli; Setareh A. Williams; David M. Kern; Hanaa Elhefni; Ned Pethick; Catrin Wessman; Siting Zhou; Frank Trudo

11,716; P < 0.0001). Asthma-related costs, representing 29% of total costs, were nearly twice as high among patients with ACOS (


International Journal of Chronic Obstructive Pulmonary Disease | 2014

A US database study characterizing patients initiating a budesonide–formoterol combination versus tiotropium bromide as initial maintenance therapy for chronic obstructive pulmonary disease

David M. Kern; Setareh A. Williams; Ozgur Tunceli; Catrin Wessman; Siting Zhou; Ned Pethick; Hanaa Elhefni; Frank Trudo

6,319 vs. 3,356; P < 0.0001). Cost differences were driven by large differences in the proportions of patients with an inpatient hospitalization (34.0% vs. 14.6%; P < 0.0001) or emergency department visit (29.6% vs. 19.9%; P < 0.0001). Nearly all prespecified comorbid conditions were more prevalent in the ACOS group. CONCLUSIONS Patients with asthma and COPD had nearly double the health care costs as did patients with asthma without COPD. The overall disease profile of patients with asthma should be considered when managing patients, rather than treating asthma as a solitary condition.


International Journal of Chronic Obstructive Pulmonary Disease | 2015

Comparative effectiveness of budesonide/formoterol combination and tiotropium bromide among COPD patients new to these controller treatments.

Frank Trudo; David M. Kern; Jill Davis; Ozgur Tunceli; Siting Zhou; Emma L Graham; Charlie Strange; Setareh A. Williams

Background The purpose of this study was to characterize changes in statin utilization patterns in patients newly initiated on therapy in the 2 years following the release of the 2013 American College of Cardiology/American Heart Association (ACC/AHA) cholesterol management guideline in a large US health plan population. Methods and Results This retrospective, observational study used administrative medical and pharmacy claims data to identify patients newly initiated on statin therapy over 4 quarters prior to and 8 quarters following the release of the guideline (average N/quarter=3596). Patients were divided into the 4 statin benefit groups (SBGs) based on risk factors and laboratory lipid levels as defined in the guideline: SBG1 (with atherosclerotic cardiovascular disease [ASCVD]; N=1046/quarter), SBG2 (without ASCVD, with low‐density lipoprotein cholesterol ≥190 mg/dL; N=454/quarter), SBG3 (without ASCVD, aged 40–75 years, with diabetes mellitus, low‐density lipoprotein cholesterol 70–189 mg/dL; N=1391/quarter), SBG4 (no ASCVD or diabetes mellitus, age 40–75 years, low‐density lipoprotein cholesterol 70–189 mg/dL, estimated 10‐year ASCVD risk of ≥7.5%; N=705/quarter). Demographic variables, statin utilization patterns, lipid levels, and comorbidities were analyzed for pre‐ and postguideline periods. Postguideline, gradually increased high‐intensity statin initiation occurred in SBG1, SBG2, and in SBG3 patients with 10‐year ASCVD risk ≥7.5%. Moderate‐ to high‐intensity statin initiation gradually increased among SBG4 patients. Recommended‐intensity statin choice changed to a greater degree among patients treated by specialty care physicians. Regarding sex, target‐intensity statin initiation was lower in women in all groups before and after guideline release. Conclusions Prescriber implementation of the guideline recommendations has gradually increased, with the most marked change in the increased initiation of high‐intensity statins in patients with ASCVD and in those treated by a specialist.


BMC Health Services Research | 2015

Healthcare utilization and costs associated with S. aureus and P. aeruginosa pneumonia in the intensive care unit: a retrospective observational cohort study in a US claims database

Moe H. Kyaw; David M. Kern; Siting Zhou; Ozgur Tunceli; Hasan S. Jafri; Judith Falloon

BACKGROUND Comparative effectiveness of the budesonide-formoterol fumarate dihydrate combination (BFC) and the fluticasone propionate-salmeterol combination (FSC) therapy on asthma exacerbation has not been assessed in real-world settings in the United States. OBJECTIVE To compare exacerbation rates and health care utilization for patients with asthma who initiate BFC versus FSC therapy. METHODS This retrospective cohort comparative effectiveness study queried medical and pharmacy data for patients with asthma from a large managed care data repository that covers major US population centers. The patients were 12 to 64 years old, with ≥12 months of pre- and postindex enrollment and ≥1 pharmacy claim(s) for BFC or FSC initiated during June 1, 2007, and September 30, 2010; the first prescription fill date was defined as the index date. Patients with other respiratory diseases and/or cancer were excluded. Exacerbation was defined as asthma-related hospitalization, emergency department visit, and/or oral corticosteroid prescription fill. Cohorts were matched by using propensity scores. RESULTS A total of 3043 patients per cohort were matched and balanced. During the 12 months following the initiation the BFC cohort had lower adjusted exacerbations per person year versus the FSC cohort (0.85 vs 0.93; RR 0.92, 95% CI [0.85-0.99]), lower oral corticosteroid fill rates, and fewer asthma-related emergency department visits but comparable asthma-related hospitalization. CONCLUSIONS Asthma exacerbation was lower for BFC versus FSC initiators due to lower rates of oral corticosteroid use and asthma-related emergency department visits, which indicate better treatment effectiveness of those patients initiated with BFC compared with FSC.


The American Journal of Managed Care | 2015

Treatment Patterns, Healthcare Utilization, and Costs of Chronic Opioid Treatment for Non-Cancer Pain in the United States

David M. Kern; Siting Zhou; Soheil Chavoshi; Ozgur Tunceli; Mark Sostek; Joseph Singer; and Robert J. LoCasale

Objective To compare clinical and demographic characteristics, resource utilization and costs of chronic obstructive pulmonary disease (COPD) patients prior to initiating budesonide–formoterol combination (BFC) or tiotropium-maintenance therapy. Materials and methods This cross-sectional study used claims-based diagnosis to identify COPD patients in the HealthCore Integrated Research Database who initiated BFC or tiotropium therapy between March 1, 2009 and January 31, 2012 (intake period); the index date was defined as the initial prescription fill for either agent. Patients diagnosed with respiratory tract cancer or receiving inhaled corticosteroids/long-acting β2-adrenergic agonists or tiotropium in 12 months prior to index date were excluded. Categorical variables were evaluated with χ2 tests; mean cost differences were evaluated using γ-regression. Results Overall, 6,940 BFC and 10,831 tiotropium patients were identified. The BFC group was younger (mean age 64 versus 67 years), with a greater proportion of females (54% versus 51%). BFC-treated patients had more comorbid respiratory conditions, including asthma (25% versus 13%), but fewer comorbid cardiovascular conditions, including atherosclerosis (7% versus 10%) and myocardial infarction (4% versus 6%). A greater proportion of BFC patients received prior respiratory medication, including oral corticosteroids (46% versus 35%) and short-acting β2-agonists (44% versus 35%). Tiotropium-treated patients had a greater mean number of COPD-related outpatient visits (4.6 versus 4.1). BFC-treated patients had lower total all-cause (


Advances in Therapy | 2014

Description of Cardiovascular Event Rates in Patients Initiating Chronic Opioid Therapy for Noncancer Pain in Observational Cohort Studies in the US, UK, and Germany

Robert J. LoCasale; David M. Kern; Pierre Chevalier; Siting Zhou; Soheil Chavoshi; Mark Sostek

17,259 versus


Circulation | 2016

Abstract 19179: Impact of the 2013 ACC/AHA Cholesterol Management Guideline: Have Treatment Patterns Evolved After 2 Years?

Tope Olufade; Deborah Anzalone; Siting Zhou; Vincent J. Willey; Mark J. Cziraky

17,926) and COPD-related (


Circulation | 2015

Abstract 17287: Increase in Utilization of High-intensity Statin Among New Users After the Release of the 2013 ACC/AHA Cholesterol Management Guideline

Tope Olufade; Deborah Anzalone; David M. Kern; Ozgur Tunceli; Siting Zhou; Vince Willey; Mark J. Cziraky

1,718 versus

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