Serial scans and stillbirth risk
The 318,768 (24.4%) pregnancies that were recorded as high risk had a
shorter median length of pregnancy (273 vs 279 days, p <0.01)
and a 70% higher rate of stillbirth compared to pregnancies designated
low risk (Table 2). In this high-risk group, 289,285 pregnancies
(90.8%) were monitored with serial scans according to protocol, and had
a stillbirth rate of 5.64 (RR compared to low risk: 1.6, CI 1.5-1.7).
Pregnancies which did not receive serial scans had a stillbirth rate
that was more than twice as high as those that did have serial scans:
11.94 (RR compared to low risk: 3.3, CI 3.0-3.7).