Table 1.

Data summary by centre and diagnostic group at initial scan. Values are numbers (percentages) unless stated otherwise

Hospitals	No of women	Empty gestational sac	Gestational sacs with a yolk sac	Embryo present	Viable at 11-14 weeks
Queen Charlottes	791	243 (31)	320 (40)	228 (29)	285 (36)
St Thomas’s	695	181 (26)	365 (53)	149 (21)	326 (47)
St George’s	457	265 (58)	156 (34)	36 (8)	223 (49)
St Mary’s	366	137 (37)	146 (40)	83 (23)	174 (48)
Chelsea and Westminster	283	67 (24)	132 (47)	84 (30)	138 (49)
Northwick Park	135	55 (41)	54 (40)	26 (19)	64 (47)
Princess Anne	118	16 (14)	59 (50)	43 (36)	55 (47)
All data	2845	964 (34)	1232 (43)	649 (23)	1265 (44)