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. 2019 Apr 20;9(4):e023101. doi: 10.1136/bmjopen-2018-023101

Table 1.

Measurement frequency and maximum return periods according to gestational age—Maternal Actigraphy Exploratory Study I

Gestational age (weeks) Measurement frequency (Hz) Maximum return period (weeks)
19–32 20 4
33–36 30 2
37–42 50 1