Categorising composites

In this tutorial, we will explore how to convert continuous composites, like the DAS28ESR or SDAI, into discrete disease activity levels.

using RheumaComposites
using Unitful

As long as the composite you are defining is a continuous composite, all you need to do is to call categorise.

sdai = SDAI(tjc=2, sjc=1, pga=6u"cm", ega=5.5u"cm", crp=15u"mg/L")
sdai isa ContinuousComposite

true

Well, that was expected!

Now let's see what the discrete disease activity level of this score would be.

categorise(sdai)

"moderate"

Cutoffs

The cutoffs used per composite and category are:

Disease activity	DAS28ESR	DAS28CRP	SDAI	CDAI
Remission	$<$ 2.6	$<$ 2.4	$\le$ 3.3	$\le$ 2.8
Low	$\le$ 3.2	$\le$ 2.9	$\le$ 11.0	$\le$ 10.0
Moderate	$\le$ 5.1	$\le$ 4.6	$\le$ 26.0	$\le$ 22.0
High	$>$ 5.1	$>$ 4.6	$>$ 26.0	$>$ 22.0

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