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KCE reports vol. 6A Prenatale zorg 188
Study Ref Population Intervention Outcomes Results
(95% CI 0.52 to 1.81)
Comments Study
type
EL
Savitz et 4 [53] 3655 pregnant Women at 24 to 29 weeks of Differences in estimates Mean duration of gestation
CH 2b
al., 2002
women in the gestation were recruited and between 4 groups estimate:
USA from 1995 gestational age estimates were
Group 1: 277.1 days
to 2001 compared to actual delivery Proportion of preterm Group 2: 274.3 days
dates by four algorithms births predicted (< 37 Group 3: 274.1 days
Group 1: LMP only
weeks)
Group 4: 274.5 days
Proportion of post-term Proportion preterm: no difference
Group 2: ultrasound only births predicted (> 41 between the 4 groups, kappa =
weeks)
0.72, 95% CI 0.68 to 0.75
Group 3: LMP except when a
discrepancy º 7 days existed in
which case ultrasound dating was
used
Group 4: same as Group 3 but
for º 14 days
Deviation between
predicted and actual
delivery dates
Proportion post-term: LMP 12.1%;
all other groups 3.4% to 4.5%,
kappa = 0.16, 95% CI 0.11 to 0.20
Predicted vs. actual delivery:
Group 1, within 1 week, 48%
Groups 2 to 4, within 1 week,
55% to 58% predicted
correctly
A further 15.7% within 2
weeks later for group 1
A further 15.6% to 16.4% 2
weeks later for groups 2-4
At more than 2 weeks
afterward, 11.5% for group 1
and 2.3% to 3.2% for groups 2
to 4