Meaning of Achilles Warning Code 402

Implementers
1

Hello,

I received the following warning message code after running Achilles:

WARNING: 402-Number of persons by condition occurrence start month, by condition_concept_id; 10 concepts have a 100% change in monthly count of events

Could someone please explain the meaning of this warning message as I have also received warning codes 420, 602, 802 and 820 which are similar?

2

Hello,

Has anyone encountered this Achilles error before? And if so, what does one do to resolve the problem?

Regards,
Vimala

3

@vjacob These types of errors may hint at a data problem (or a data flow problem) resulting in an unexpected drop-off of patient diagnosis information. Alternatively, it could just mean that the real ebb and flow in the dataset has a bunch of patients with something one month and very few the next.

The main point is: Look at your raw data and see if it makes sense that this concept would drop off from one month to the next. If it makes sense, then it is not an error, just a helpful guide from Achilles Heel.

4

Heel outputs are generated by Heel rules.

Rules have IDs.

The output in AchillesWeb does not list all columns that are useful.

In R, you can run command:
fetchAchillesHeelResults(connectionDetails,resultsDatabaseSchema)

or see the table in the database.

(see bottom part of section here https://github.com/OHDSI/Achilles/blob/master/README.md#getting-started

To see details of each rule, see this file:
either on github (make sure you scroll to the right) https://github.com/OHDSI/Achilles/blob/master/inst/csv/achilles_rule.csv

or by downloading it via this link: (save link as)
https://raw.githubusercontent.com/OHDSI/Achilles/master/inst/csv/achilles_rule.csv

As Jon said - it is doing some simple trend analysis.
402 is an analysis_id (at which achilles pre-computation it is looking)