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Before you Analyze


The data collected in the Janus study is not fully annotated. It is important that you understand the experimental setup and the recording methods before you draw statistical conclusions from the data. We recommend the following steps:

  • Read the experimental Grouped Macros and Grouped Micros contain observations of pathologies by categoies as defined in the Appendixes of Documentation
  • Contact us so we can help you with your analysis at janus.request@gmail.com
  • Remember that the collection of histopathological data (microcodes) was not consistent across tissues and studies.
  • Remember that necroscopies were not collected for all animals
  • If you plan to aggregate the results of multiple studies remember that the control treatment conditions between studies changed in recorded and unrecorded ways. For example the average control lifespan varies between studies, often for unknown reasons.


Data for Download


Beginner users should start with the csv files.


The database terms and pathologies key describe the terms used in the data set. The data tables are organized by animal id. Demographics contains experimental parameters, demographics, and lifespan for each mouse.


The pathological data is available from several files, all organized by the same number and order of animal as demographics (the tables can be pasted side by side and will line up). Macros contains gross necroscopy observations for all mice which had a necroscopy perfomed (noted in demographics). Micros contains histological data for each mouse, but beware that the histological data was not sampled consistently.


Grouped Macros and Grouped Micros contain observations of pathologies by categoies as defined in the Appendixes of Grahn et al 1995. These categories are useful for deriving statistical significance from pathologies that were rarely observed, but belong to a category of more commonly observed pathologies.


*note if you are using an older version of excel the files might not load completely, don't worry the pathologies are ordered by their frequency so you will get the most common ones.


Advanced users who wish to access the full working database used to build this website may download an sql dump of it ( sql ).


Archivists with a historical interest in the studies may download a copy of the database as we received it from the NRA archival effort in 2000. It is stored as a Microsoft Access database. ( mdb )


list all mice