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Dive into the research topics where Siok Swan Tan is active.

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Featured researches published by Siok Swan Tan.


BMJ | 2013

Diagnosis related groups in Europe : moving towards transparency, efficiency, and quality in hospitals?

Reinhard Busse; Alexander Geissler; Ain Aaviksoo; Francesc Cots; Unto Häkkinen; Conrad Kobel; Céu Mateus; Zeynep Or; Jacqueline O'Reilly; Lisbeth Serdén; Andrew Street; Siok Swan Tan; Wilm Quentin

Hospitals in most European countries are paid on the basis of diagnosis related groups. Reinhard Busse and colleagues find much variation within and between systems and argue that they could be improved if countries learnt from each other


European Journal of Health Economics | 2009

Comparing methodologies for the cost estimation of hospital services

Siok Swan Tan; Frans Rutten; B. M. Ineveld; William K. Redekop; L. Hakkaart-van Roijen

The aim of the study was to determine whether the total cost estimate of a hospital service remains reliable when the cost components of bottom-up microcosting were replaced by the cost components of top-down microcosting or gross costing. Total cost estimates were determined in representative general hospitals in the Netherlands for appendectomy, normal delivery, stroke and acute myocardial infarction for 2005. It was concluded that restricting the use of bottom-up microcosting to those cost components that have a great impact on the total costs (i.e., labour and inpatient stay) would likely result in reliable cost estimates.


BMC Health Services Research | 2013

Feasibility, reliability and validity of a questionnaire on healthcare consumption and productivity loss in patients with a psychiatric disorder (TiC-P)

C. Bouwmans; Kim de Jong; Reinier Timman; Moniek C Zijlstra-Vlasveld; Christina M. van der Feltz-Cornelis; Siok Swan Tan; Leona Hakkaart-van Roijen

BackgroundPatient self-report allows collecting comprehensive data for the purpose of performing economic evaluations. The aim of the current study was to assess the feasibility, reliability and a part of the construct validity of a commonly applied questionnaire on healthcare utilization and productivity losses in patients with a psychiatric disorder (TiC-P).MethodsData were derived alongside two clinical trials performed in the Netherlands in patients with mental health problems. The response rate, average time of filling out the questionnaire and proportions of missing values were used as indicators of feasibility of the questionnaire. Test-retest analyses were performed including Cohen’s kappa and intra class correlation coefficients to assess reliability of the data. The construct validity was assessed by comparing patient reported data on contacts with psychotherapists and reported data on long-term absence from work with data derived from registries.ResultsThe response rate was 72%. The mean time needed for filling out the first TiC-P was 9.4 minutes. The time needed for filling out the questionnaire was 2.3 minutes less for follow up measurements. Proportions of missing values were limited (< 2.4%) except for medication for which in 10% of the cases costs could not be calculated. Cohen’s kappa was satisfactory to almost perfect for most items related to healthcare consumption and satisfactory for items on absence from work and presenteeism. Comparable results were shown by the ICCs on variables measuring volumes of medical consumption and productivity losses indicating good reliability of the questionnaire.Absolute agreement between patient-reported data and data derived from medical registrations of the psychotherapists was satisfactory. Accepting a margin of +/− seven days, the agreement on reported and registered data on long-term absence from work was satisfactory. The validity of self-reported data using the TiC-P is promising.ConclusionsThe results indicate that the TiC-P is a feasible and reliable instrument for collecting data on medical consumption and productivity losses in patients with mild to moderate mental health problems. Additionally, the construct validity of questions related to contacts with psychotherapist and long-term absence from work was satisfactory.


European Child & Adolescent Psychiatry | 2007

Societal costs and quality of life of children suffering from attention deficient hyperactivity disorder (ADHD)

L. Hakkaart-van Roijen; B. W. C. Zwirs; C. Bouwmans; Siok Swan Tan; T. W. J. Schulpen; L. Vlasveld; Jan K. Buitelaar

BackgroundThe impact of attention deficit hyperactive disorder (ADHD) in the Netherlands on health care utilisation, costs and quality of life of these children, as well as of their parents is unknown.ObjectiveThe aim of this study was to assess the direct medical costs of patients suffering from ADHD and their quality of life as well as the direct medical costs of their mothers.Study designWe selected a group of 70 children who were being treated by a paediatrician for ADHD based on the DSM-IV diagnostic criteria for ADHD. For comparison’s sake, we also included a non-matched group of 35 children with behaviour problems and 60 children with no behaviour problem from a large school population-based study on the detection of ADHD. We collected information on the health care utilisation of the children applying the Trimbos and iMTA questionnaire on Costs associated with Psychiatric illness’ (TiC-P). Their health related quality of life was collected by using the Dutch 50-item parent version of the Child Health Questionnaire (CHQ PF-50). Measurements were at baseline and at 6 months. Subsequently, we collected data on the health utilisation of the mothers and their production losses due to absence from work and reduced efficiency.ResultsThe mean direct medical costs per ADHD patient per year were €2040 or €1173 when leaving out one patient with a long-term hospital admission, compared to €288 for the group of children with behaviour problems and €177 for the group of children with no behaviour problems. The direct medical costs for children who had psychiatric co-morbidities were significantly higher compared to children with ADHD alone. The mean medical costs per year for the mothers of the ADHD patients were significantly higher than for the mothers of the children with behaviour problems and the mothers of children with no behaviour problems respectively €728, €202 and €154. The physical summary score showed no significant differences between the groups. However, the score on the Psychosocial Summary Score dimension was significantly lower for ADHD patients compared to the scores of the children in the two other samples. The mean annual indirect costs due to absence from work and reduced efficiency at work were €2243 for the mothers of the ADHD patients compared to €408 for the mothers of children with behaviour problems and €674 for the mothers of children with no behaviour problems.ConclusionOur study showed that the direct medical costs of ADHD patients were relatively high. Additionally, our study indicated that ADHD appears to be accompanied by higher (mental) health care costs for the mothers of ADHD patients and by increased indirect costs for this group.


Clinical Nutrition | 2013

The economic costs of disease related malnutrition

Karen Freijer; Siok Swan Tan; Marc A. Koopmanschap; Judith M.M. Meijers; Ruud J.G. Halfens; Mark J.C. Nuijten

BACKGROUND & AIMS Disease related malnutrition (under-nutrition caused by illness) is a worldwide problem in all health care settings with potentially serious consequences on a physical as well as a psycho-social level. In the European Union countries about 20 million patients are affected by disease related malnutrition, costing EU governments up to € 120 billion annually. The aim of this study is to calculate the total additional costs of disease related malnutrition in The Netherlands. METHODS A cost-of-illness analysis was used to calculate the additional total costs of disease related malnutrition in adults (>18 years of age) for The Netherlands in 2011 in the hospital, nursing- and residential home and home care setting, expressed as an absolute monetary value as well as a percentage of the total Dutch national health expenditure and as a percentage of the total costs of the studied health care sectors in The Netherlands. RESULTS The total additional costs of managing adult patients with disease related malnutrition were estimated to be € 1.9 billion in 2011 which equals 2.1% of the total Dutch national health expenditure and 4.9% of the total costs of the health care sectors analyzed in this study. CONCLUSIONS The results of this study show that the additional costs of disease related malnutrition in adults in The Netherlands are considerable.


Journal of Clinical Pharmacy and Therapeutics | 2013

Real‐world health care costs of relapsed/refractory multiple myeloma during the era of novel cancer agents

Jennifer G. Gaultney; Margreet Franken; Siok Swan Tan; William K. Redekop; Peter C. Huijgens; Pieter Sonneveld; Ca Uyl-de Groot

What is known and objective:  High costs of novel agents increasingly put pressure on limited healthcare budgets. Demonstration of their real‐world costs and cost‐effectiveness is often required for reimbursement. However, few published economic evaluations of novel agents for multiple myeloma exist. Moreover, existing cost analyses were heavily based on conventionally treated patients. We investigated real‐world health care costs of relapsed/refractory multiple myeloma in Dutch daily practice.


Journal of Intensive Care Medicine | 2008

Review of A Large Clinical Series: A Microcosting Study of Intensive Care Unit Stay in the Netherlands

Siok Swan Tan; Leona Hakkaart-van Roijen; Maiwenn Al; C. Bouwmans; Marga E. Hoogendoorn; Peter E. Spronk; Jan Bakker

The primary objective of this study was to estimate the actual daily costs of intensive care unit stay using a microcosting methodology. As a secondary objective, the degree of association between daily intensive care unit costs and some patient characteristics was examined. This multicenter, retrospective cost analysis was conducted in the medical-surgical adult intensive care units of 1 university and 2 general hospitals in the Netherlands for 2006, from a hospital perspective. A total of 576 adult patients were included, consuming a total of 2868 nursing days. The mean total costs per intensive care unit day were 1911, with labour (33%) and indirect costs (33%) as the most important cost drivers. An ordinary least squares analysis including age, Nine Equivalent of Nursing Manpower Use score/Therapeutic Intervention Scoring System score, mechanical ventilation, blood products, and renal replacement therapy was able to predict 50% of the daily intensive care unit costs.


Pediatrics | 2013

Developmental Trajectories of Daily Activities in Children and Adolescents With Cerebral Palsy

Rimke C Vos; Jules G. Becher; Marjolijn Ketelaar; Dirk-Wouter Smits; Jeanine M Voorman; Siok Swan Tan; Heleen A. Reinders-Messelink; Annet J. Dallmeijer

OBJECTIVES: To describe the developmental trajectories of mobility performance and daily activities in children and young adults with cerebral palsy (CP). To explore the influence of gross motor function and intellectual disability on these trajectories. METHODS: Four hundred and twenty-four Dutch participants with CP (aged 1–20 years at study onset) were followed yearly over a period of 2 to 4 years. Developmental trajectories (from ages 1–16 years) were described for mobility performance and performance of daily activities, assessed by using the Vineland Adaptive Behavior Scale for gross motor function (classified by the Gross Motor Function Classification System) and intellectual disability (by IQ or school type). A subanalysis was done for performance of daily activities in a subgroup of participants without intellectual disability (aged 1–24 years). RESULTS: The developmental trajectories of mobility performance differed according to levels of gross motor function but not levels of intellectual disability. Intellectual disability affected the performance of daily activities, with lower overall trajectory levels for participants with intellectual disabilities. For participants without intellectual disability, high-level developmental trajectories were found, with values similar to those of typically developing children despite differences in gross motor function level. CONCLUSIONS: Mobility performance is determined mainly by levels of gross motor function. For performance of daily activities, intellectual disability was a more important determinant. Participants without intellectual disability showed developmental trajectories approaching values for typically developing participants. These estimated trajectories can guide rehabilitation interventions and future expectations for children and young adults with CP.


Global Health Action | 2014

Step-by-step guideline for disease-specific costing studies in low- and middle-income countries: a mixed methodology

Marleen E. Hendriks; Piyali Kundu; Alexander C. Boers; Oladimeji Akeem Bolarinwa; Mark J. te Pas; Tanimola M. Akande; Kayode Agbede; Gabriella B. Gomez; William K. Redekop; Constance Schultsz; Siok Swan Tan

Background Disease-specific costing studies can be used as input into cost-effectiveness analyses and provide important information for efficient resource allocation. However, limited data availability and limited expertise constrain such studies in low- and middle-income countries (LMICs). Objective To describe a step-by-step guideline for conducting disease-specific costing studies in LMICs where data availability is limited and to illustrate how the guideline was applied in a costing study of cardiovascular disease prevention care in rural Nigeria. Design The step-by-step guideline provides practical recommendations on methods and data requirements for six sequential steps: 1) definition of the study perspective, 2) characterization of the unit of analysis, 3) identification of cost items, 4) measurement of cost items, 5) valuation of cost items, and 6) uncertainty analyses. Results We discuss the necessary tradeoffs between the accuracy of estimates and data availability constraints at each step and illustrate how a mixed methodology of accurate bottom-up micro-costing and more feasible approaches can be used to make optimal use of all available data. An illustrative example from Nigeria is provided. Conclusions An innovative, user-friendly guideline for disease-specific costing in LMICs is presented, using a mixed methodology to account for limited data availability. The illustrative example showed that the step-by-step guideline can be used by healthcare professionals in LMICs to conduct feasible and accurate disease-specific cost analyses.Background Disease-specific costing studies can be used as input into cost-effectiveness analyses and provide important information for efficient resource allocation. However, limited data availability and limited expertise constrain such studies in low- and middle-income countries (LMICs). Objective To describe a step-by-step guideline for conducting disease-specific costing studies in LMICs where data availability is limited and to illustrate how the guideline was applied in a costing study of cardiovascular disease prevention care in rural Nigeria. Design The step-by-step guideline provides practical recommendations on methods and data requirements for six sequential steps: 1) definition of the study perspective, 2) characterization of the unit of analysis, 3) identification of cost items, 4) measurement of cost items, 5) valuation of cost items, and 6) uncertainty analyses. Results We discuss the necessary tradeoffs between the accuracy of estimates and data availability constraints at each step and illustrate how a mixed methodology of accurate bottom-up micro-costing and more feasible approaches can be used to make optimal use of all available data. An illustrative example from Nigeria is provided. Conclusions An innovative, user-friendly guideline for disease-specific costing in LMICs is presented, using a mixed methodology to account for limited data availability. The illustrative example showed that the step-by-step guideline can be used by healthcare professionals in LMICs to conduct feasible and accurate disease-specific cost analyses.


Critical Care | 2010

Cost-consequence analysis of remifentanil-based analgo-sedation vs. conventional analgesia and sedation for patients on mechanical ventilation in the Netherlands

Maiwenn Al; Leona Hakkaart; Siok Swan Tan; Jan Bakker

IntroductionHospitals are increasingly forced to consider the economics of technology use. We estimated the incremental cost-consequences of remifentanil-based analgo-sedation (RS) vs. conventional analgesia and sedation (CS) in patients requiring mechanical ventilation (MV) in the intensive care unit (ICU), using a modelling approach.MethodsA Markov model was developed to describe patient flow in the ICU. The hourly probabilities to move from one state to another were derived from UltiSAFE, a Dutch clinical study involving ICU patients with an expected MV-time of two to three days requiring analgesia and sedation. Study medication was either: CS (morphine or fentanyl combined with propofol, midazolam or lorazepam) or: RS (remifentanil, combined with propofol when required). Study drug costs were derived from the trial, whereas all other ICU costs were estimated separately in a Dutch micro-costing study. All costs were measured from the hospital perspective (price level of 2006). Patients were followed in the model for 28 days. We also studied the sub-population where weaning had started within 72 hours.ResultsThe average total 28-day costs were €15,626 with RS versus €17,100 with CS, meaning a difference in costs of €1474 (95% CI -2163, 5110). The average length-of-stay (LOS) in the ICU was 7.6 days in the RS group versus 8.5 days in the CS group (difference 1.0, 95% CI -0.7, 2.6), while the average MV time was 5.0 days for RS versus 6.0 days for CS. Similar differences were found in the subgroup analysis.ConclusionsCompared to CS, RS significantly decreases the overall costs in the ICU.Trial RegistrationClinicaltrials.gov NCT00158873.

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William K. Redekop

Erasmus University Rotterdam

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C. Bouwmans

Erasmus University Rotterdam

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Jan Bakker

Erasmus University Rotterdam

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Leona Hakkaart

Erasmus University Rotterdam

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Annet J. Dallmeijer

VU University Medical Center

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Frans Rutten

Erasmus University Rotterdam

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Marc A. Koopmanschap

Erasmus University Rotterdam

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Maiwenn Al

Erasmus University Rotterdam

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