Retrospective audit of different antenatal screening policies for Down's syndrome in eight district general hospitals in one health region

Diana Wellesley, Tracy Boyle, John Barber, David T Howe
Table 5

Detection of Down's syndrome in women aged <35 years by district 1994-9

Detected antenatally
Scan (weeks)Amnio-CVS* for previous affected childDetected at/after birthTotal % (95% CI) detected antenatally
DistrictSerum screen<14≥14TotalTotal
A8041131448 (19 to 67)27
B222061038 (21 to 55)16
C116082029 (13 to 46)28
D01102625 (0 to 55)8
E30104736 (8 to 64)11
F1371121152 (31 to 73)23
G110131616 (0 to 34)19
H00000606
Total168213489035 (27 to 43)138
  • * Amniocentesis or chorionic villus sampling.

  • † Data for 1997-9.