Table 1

Patient characteristics

CharacteristicsHistory of termination of pregnancies (%)Reference group (%)
Study population160001341894
Maternal age*
 Mean (SD)30.41 (5.8)30.40 (48)
 <20525 (3.3)22786 (17)
 20–252983 (18.6)187355 (14)
 26–304085 (25.5)447307 (33.3)
 31–355186 (32.4)495546 (36.9)
 >353219 (20.1)188591 (14.1)
Parity*
 09265 (57.9)613755 (45.7)
 14692 (29.3)485287 (36.2)
 21453 (9.1)169802 (12.7)
 3417 (2.6)46910 (3.5)
 ≥4172 (1.1)25822 (1.9)
SES*
 High3469 (21.7)314667 (23.4)
 Normal5488 (34.3)608113 (45.3)
 Low6861 (43)402254 (30)
Ethnicity*
 Dutch10304 (64.4)1093438 (81.5)
 Mediterranean1184 (7.4)105368 (7.9)
 Other European1012 (6.3)33728 (2.5)
 Creole1441 (9)30226 (2.3)
 Hindu341 (2.1)14523 (1.1)
 Asian605 (3.8)24408 (1.8)
 Other1086 (6.8)31519 (2.3)
Smoking*180 (1.1)5712 (0.4)
Drug dependence*91 (0.6)1232 (0.09)
Reproductive history
 Preterm delivery*165 (1)16122 (1.2)
 Cervical incompetence/Shirodkar procedure3 (0.02)381 (0.03)
 Placenta praevia*8 (0.05)183 (0.01)
 Placental abruption17 (0.1)2023 (0.2)
 Manual removal of the placenta75 (0.5)7353 (0.5)
 Postpartum haemorrhage*156 (1)19062 (1.4)
 Caesarean section*839 (5.2)101884 (7.6)
 Cervical surgery*28 (0.2)1424 (0.1)
 Uterine myoma*79 (0.5)4732 (0.4)
 Myomectomy subserous5 (0.03)257 (0.02)
 Myomectomy submucous/intramural4 (0.03)409 (0.03)
Index gravidity
 Pyelitis*20 (0.1)736 (0.05)
 Polyhydramnios5 (0.03)234 (0.02)
Mode of delivery*
 Spontaneous vaginal delivery12048 (75.4)1024044 (76.4)
 Instrumental vaginal delivery1682 (10.5)143654 (10.7)
 Elective caesarean delivery738 (4.6)70345 (5.2)
 Emergency caesarean delivery1520 (9.5)102090 (7.6)
 Perinatal mortality*109 (0.7)7602 (0.6)
  • *p<0.05.

  • SES, socioeconomic status.