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Looks wrong to me.
I think it should be *Children breathing rate is twice more than adults.*
You have a breathing rate of something. That is a posessive. On top of that, the something is plural. Therefore you need the plural possessive.
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Thank you for your answer, but I still can't get it.
What I mean is that breathing rate of children is the double of the rate of adults breathing rate. Would it be right :to say, " children's breathing rate is twice as much as adults' " ?
"Children's breathing rate is twice as much as adults'."
"A child's breathing rate is twice as much as an adult's."
"Children's breathing rate is twice that of adults'."
And so on.