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A total of 20 patients included in this study. hCG (1,500 IU) was administered intramuscularly, 3 times per week.

Which of is the correct:

  1. it means that they administrated 1500 UI all together per week?

  2. or does it mean that they administrated 4500 UI per week in total.

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    The sentence isn't grammatical. "A total of 20 patients were included in this study" would work.
    – gotube
    Aug 17 '21 at 0:28
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Your second interpretation is correct. If you wanted to give the first meaning while using the same numbers, the sentence would have to be more complicated:

hCG (a total of 1,500 IU per week) was administered intramuscularly in three separate doses per week.

... or alternatively you can simply change the numbers.

hCG (500 IU) was administered intramuscularly, 3 times per week.

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