Surely this depends on the disorder?https://twitter.com/SteveStuWill/status/881445430025887744 …
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There's better and worse cases, yeah, but I'd call it bimodal rather than a true spectrum. Onset is generally a distinct break.
Cancer's a classification bucket too, and there's better and worse cancers, but we don't speak of cancer as an extreme of normal variation.
Things in the world are neither indistinguishably alike nor absolutely distinct.
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