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Should I write this without a comma:

The evidence from this study suggests that stroke may impose a comparable risk on the survival of older patients as do heart attack due to the close resemblance of the two patient populations.

Or with a comma:

The evidence from this study suggests that stroke may impose a comparable risk on older patients’ survival, as does heart attack due to the close resemblance of the two patient populations.

Edited: "fracture" changed to "patient"

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  • Your example has errors and, as such, it is hard to say how best to punctuate.
    – Greybeard
    Jan 23 at 11:40
  • Thanks for noting this! Could you please point these errors out? Jan 23 at 11:44
  • I have edited the first part but you need to give context to justify "comparative" and "fracture population" - fracture population is particularly strange. I also think that trying to link heart attacks in the same sentence is doomed to failure.
    – Greybeard
    Jan 23 at 12:32
  • Thanks! Edited accordingly. Jan 23 at 12:56
  • This looks like Off Topic proofreading to me. And I'd say as do heart attacks (plural, not attack) is effectively an optional, parenthetical element, that should be set off by commas both before and after. Jan 23 at 13:28

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With comma. "As" is acting like a subordinating conjunction.

Some questions though. Does the 'comparable risk' refer to something being talked about in the sentence before your quote, or does it refer to the heart attack. For example "[obesity does damage]. Stroke does comparable damage, as does a heart attack." Or is it trying to say 'stroke damage is comparable to heart damage'? If it's the later, rewording might make it clearer and make your 'as' irrelevant.

"evidence suggests that both strokes and heart attacks impose comparable risks on older patient's survival due to..."

But that changes your emphasis, so it depends on what's going on before.

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    Jan 23 at 12:20

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