@SEC - there is maybe a related use case with pregnancy, where we need to describe a due date as a Duration data type expressed in weeks but with a variation of x days eg 34 weeks +/- 7 days. I’m wondering if there is a need to add an attribute to the Duration and Count data types that allows us to…

In case of durations I think we could get away with adding this, as weeks durations are not part of ISO duration standard but are included because of the needs of healtcare data (openEHR specifications even cite pregnancy as a use case). I would say that extending them to add +/- variance falls into…

I am pretty sure W is supported by the base standard - see https://en.wikipedia.org/wiki/ISO_8601#Durations There is some debate about how to handle negative durations but others have tried so my suggestion for an interval of Duration should work (may not be supported by CDR;s - would need ot check…

[image] ian.mcnicoll: I am pretty sure W is supported by the base standard Oh, then we have to fix the specs text that say otherwise

yep, seems like a tooling issue more than a gap in the specification themselves

So which data type would be best suited?

[moved from https://discourse.openehr.org/t/representation-of-genetic-positions , originally the first response to this subtopic] Pregnancy is different [from the example of genetic positions] since this is actually about imprecision. The accuracy support in quantity might (should) work for that - s…

Representation of variation in pregnancy

Clinical

heather.leslie (Heather Leslie) 10 March 2020 08:24 5

Makes good sense, but… Duration, Interval of duration, Quantity (time), Interval of quantity (time), Time, Interval of time data types - none allow a negative time or duration ie min of 0 for all. At least in the tooling…

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Representation of variation in pregnancy

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