Pack-year

[timbrisc]

Issue migrated from trac ticket # 52

component: help | priority: major

2010-08-19 21:22:36: [email protected] created the issue

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From Victoria Johnsson:

Dear Professor Gunther Schadow,

In my work I use Unified Code for Units of Measures (UCUM) for standardizing units in various clinical datasets. It works very well for most units in clinical data.

I noticed however that the UCUM specification does not mention the unit pack-year which is used to measure how much a patient has smoked.

Number of Pack Years = (Packs smoked per day) x (years as a smoker).

How do I specify this unit according to UCUM? Am I allowed to define it as a unit atom, [pack-year]?

I would be very grateful if you could help me. Thank you!