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The average percentage of minutes of low, indeterminate and high HRV in IUGR (a) and normal (b) traces. Fetal traces from the entire database (8783 traces of 2326 patients) over 10 minutes in length were grouped into extremely premature (21–26 weeks), moderately premature (27–30 weeks), mildly premature (31–34 and 35–37 weeks), term (39–40) and post-term (41–42 weeks) (Range of recording length: 11–60 min).
