Siok Swan Tan

Dr. Siok Swan Tan

orcid

Research Focus & Metrics

Academic Career Length

20Years (2007-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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7 June 2013 in BMJ
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Journal Article
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RBReinhard Busse
Reinhard Busse
AGAlexander Geissler
Alexander Geissler
AAAin Aaviksoo
Ain Aaviksoo
FCFrancesc Cots
Francesc Cots
UHUnto Häkkinen
Unto Häkkinen
WQWilm Quentin
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

15 June 2013 in BMC Health Services Research
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Journal Article
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CBClazien Bouwmans
Clazien Bouwmans
KJKim De Jong
Kim De Jong
RTReinier Timman
Reinier Timman
MZMoniek Zijlstra-Vlasveld
Moniek Zijlstra-Vlasveld
CFChristina M. Van Der Feltz-Cornelis
Christina M. Van Der Feltz-Cornelis
LRLeona Hakkaart-Van Roijen
Leona Hakkaart-Van Roijen
Patient 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). Data 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. The 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. The 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.

9 November 2017 in PLOS ONE
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TKTim A. Kanters
Tim A. Kanters
CBClazien A. M. Bouwmans
Clazien A. M. Bouwmans
NLNaomi van der Linden
Naomi van der Linden
STSiok Swan Tan
Siok Swan Tan
LRLeona Hakkaart-Van Roijen
Leona Hakkaart-Van Roijen
Dutch health economic guidelines include a costing manual, which describes preferred research methodology for costing studies and reference prices to ensure high quality studies and comparability between study outcomes. This paper describes the most important revisions of the costing manual compared to the previous version. An online survey was sent out to potential users of the costing manual to identify topics for improvement. The costing manual was aligned with contemporary health economic guidelines. All methodology sections and parameter values needed for costing studies, particularly reference prices, were updated. An expert panel of health economists was consulted several times during the review process. The revised manual was reviewed by two members of the expert panel and by reviewers of the Dutch Health Care Institute. The majority of survey respondents was satisfied with content and usability of the existing costing manual. Respondents recommended updating reference prices and adding some particular commonly needed reference prices. Costs categories were adjusted to the international standard: 1) costs within the health care sector; 2) patient and family costs; and 3) costs in other sectors. Reference prices were updated to reflect 2014 values. The methodology chapter was rewritten to match the requirements of the costing manual and preferences of the users. Reference prices for nursing days of specific wards, for diagnostic procedures and nurse practitioners were added. The usability of the costing manual was increased and parameter values were updated. The costing manual became integrated in the new health economic guidelines.

14 March 2008 in The European Journal of Health Economics
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Journal Article
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STSiok Swan Tan
Siok Swan Tan
FRF. F. H. Rutten
F. F. H. Rutten
BIB. M. van Ineveld
B. M. van Ineveld
WRW. K. Redekop
W. K. Redekop
LRL. Hakkaart-Van Roijen
L. Hakkaart-Van Roijen

1 February 2013 in Clinical Nutrition
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Journal Article
Closed access
KFKaren Freijer
Karen Freijer
STSiok Swan Tan
Siok Swan Tan
MKMarc A. Koopmanschap
Marc A. Koopmanschap
JMJudith M.M. Meijers
Judith M.M. Meijers
RHRuud J.G. Halfens
Ruud J.G. Halfens
MNMark J.C. Nuijten
Mark J.C. Nuijten

13 April 2012 in International Journal of Technology Assessment in Health Care
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Journal Article
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STSiok Swan Tan
Siok Swan Tan
CBClazien A. M. Bouwmans
Clazien A. M. Bouwmans
FRFrans F. H. Rutten
Frans F. H. Rutten
LRLeona Hakkaart-Van Roijen
Leona Hakkaart-Van Roijen
Objectives: In 2000, the first “Dutch Manual for Costing: Methods and Reference Prices for Economic Evaluations in Healthcare” was published, followed by an updated version in 2004. The purpose of the Manual is to facilitate the implementation and assessment of costing studies in economic evaluations. New developments necessitated the publication of a thoroughly updated version of the Manual in 2010. The present study aims to describe the main changes of the 2010 Manual compared with earlier editions of the Manual.Methods: New and updated topics of the Manual were identified. The recommendations of the Manual were compared with the health economic guidelines of other countries, eliciting strengths and limitations of alternative methods.Results: New topics in the Manual concern medical costs in life-years gained, the database of the Diagnosis Treatment Combination (DBC) casemix System, reference prices for the mental healthcare sector and the costs borne by informal care-givers. Updated topics relate to the friction cost method, discounting future effects and options for transferring cost results from international studies to the Dutch situation.Conclusions: The Action Plan is quite similar to many health economic guidelines in healthcare. However, the recommendations on particular aspects may differ between national guidelines in some respects. Although the Manual may serve as an example to countries intending to develop a manual of this kind, it should always be kept in mind that preferred methods predominantly depend on a country's specific context.