Children's Core for Biomedical Statistics

Request CCBS Services

The CCBS is committed to providing statistical collaboration with investigators at Seattle Children's to support pediatric research. CCBS support is available to all Seattle Children's employees; however, depending on availability and timeframe, priority may be given to CCTR members and affiliates.

Request a consultation

Successful collaborations require advance notice. Consultations for externally funded grants must be submitted at least 8 weeks (and preferably more) prior to the grant deadline, and at least 4 weeks for internally funded grants.


  • Statistical support services are charged at a flat staff rate of $105 per hour for internal projects.
  • Data management consulting services are charged at a flat staff rate of $65 per hour for internal projects.
  • Faculty and external rates are available upon request.

Levels of Support

The following are the levels of CCBS support according to scope of work

Minimal support

Very short-term, ad-hoc support 


  • Advising PI about study design or choice of statistical methods to use
  • Brief consultation on database design
  • Helping PI respond to reviewer comments on manuscript that biostatistician has not helped prepare
  • Brief follow-up to previous collaborative effort, e.g., re-run analyses with additional data, help with abstract or poster presentation 

Ongoing but very limited support  


  • Statistical oversight: Supervise a colleague who is FTE-funded to carry out analysis
  • Statistical oversight of junior investigator (e.g. for NIH K- awards, post-doctoral and training grants)
  • Limited database support
  • DSMB membership
  • May include regular billable meeting

Ongoing but limited support


  • Assist experienced PI with very small-scale projects such as pilot studies, phase 1 trials, modest proof-of-concept animal studies; help with study design, provide some limited-scope statistical analysis and limited manuscript support
  • Regular, frequent meetings and discussions with an investigator or team for an ongoing research program; mentoring/oversight that does not include conducting analyses. Mentoring may take additional time (e.g., to reproduce analyses or meet with investigators)
  • Note: If it becomes clear that biostastician will have do most of the data cleaning and manipulation including performing complex programming to create analytic dataset, the scope will change and level of effort would have to be revised accordingly and escalated to a higher level.

Ongoing support for simple research projects

Involves support for projects that require straightforward analyses and do not involve extensive data preparation or mentoring. PI provides clean and well-documented dataset, in a format that is easily imported into a statistical package for analysis.

Moderate support

Comprehensive support for average-size research projects

This level of support is suitable for straightforward projects that require uncomplicated data management/manipulation or statistical support, such as:

  • Routine study design and analysis using off-the-shelf procedures available in standard statistical software
  • Projects in which investigator provides clean and well-documented primary datasets for statistical analysis
  • Comprehensive support for publications and other deliverables including 1–2 manuscripts, abstracts, work-in-progress reports, posters, etc.
  • Database support and data monitoring

Comprehensive support for large or complex projects

This level of support involves high-level involvement of the statistician in the development and implementation of the research project and communication of study results. Responsibilities may include: 

  • Development and/or implementation of complex study designs
  • Assembly of datasets from large, complex or poorly documented sources (e.g., administrative or survey databases)
  • Planning and/or implementation of interim data analyses
  • Analysis and coordination of analyses for multi-site projects
  • Multiple imputation of missing data
  • Developing algorithms to identify units of analysis and define analysis variables
  • Analysis of data from trials with unique clinical trial design that require a high level of sophistication in developing biostatistical solutions
  • Application of specialized statistical methods that may include:
    • Application of statistical methodology new to biostatistician, which requires extensive time to research literature and obtain corresponding software if available, or develop software to implement the method
    • Application of methodology new to statistical community (i.e., recently published), which may not have corresponding software to implement it, thus necessitating considerable effort to develop it
    • Development of new analytic methodology because an appropriate one doesn’t currently exist in the literature 
  • Active participation in publications, with opportunity for first authored papers 
  • Project-related travel and external presentations
  • Database design, testing and data quality control

Preparing for Your Consultation Appointment

For study design consultations, it is helpful to bring background materials such as a draft of the grant application, Institutional Review Board (IRB) application or study protocol. Copies of key publications related to your topic can also be useful.

If you will be requesting a statistical power or sample size calculation for a randomized trial, your consultant will need information about the expected outcomes in the control group and the magnitude of effect that you would like the study to be able to detect. Most commonly, estimates of mean and standard deviation of the primary outcome measurement for each group are adequate. Studies for which the primary outcome measurement is reported as a proportion do not require a standard deviation estimate. Maximum recruitment potential is also a key factor in evaluating sample size options, so information on the availability of eligible subjects at study sites, budgetary constraints or logistical limitations is also useful.

For projects needing statistical support for data analysis, please bring copies of case report form templates, data coding keys, electronic file templates and/or the actual data file (s).

Additional resources