zero or 0

I was once told to use zero instead of 0 in this or similar instances:

The patient is 30-year-old gravida zero female. 

I was told that a 0 value should not stand alone. I do not have a Book of Style. Anyone out there know the correct way? TIA.

• zero or 0 - kjg
  • I was taught gravida 0. NM - PoodleLady

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