Figure 1.

Number of recordings Number of FMCG recordings obtained between the 12th and 42nd week of gestation. Viable recordings were available as early as the 15th week and, from the 20th week on, all recordings could be evaluated (no signal = signal-to-noise ratio too low for the identification of fetal QRS complexes; signal = sufficient signal quality for evaluation).

van Leeuwen et al. BMC Pregnancy and Childbirth 2004 4:6   doi:10.1186/1471-2393-4-6
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