Læknablaðið - 15.03.1995, Page 36

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LÆKNABLAÐIÐ 1995; 81
Table I. Twin pregnancies ^ 16 weeks gestation in Iceland 1990-1993 by type of fertilisation and with perinatal mortality rate
(PNMR) and total perinatal related wastage (TPRW) /1000 deliveries.
N (%) Rate PNMR TPRW
Natural twins 202 (79.5) 1 : 90 20.5 54.5
Assisted conception 52 (20.5) 1 : 3 19.6 38.5
All twins 254 (100.0) 1 : 73 20.1 46.5
Table II. Comparison of age and height of the mothers and length of gestation.
Mean S. D. Range t P
Age Natural conception (years) 28.9 5.41 16-41 4.11 p<0.001
/n vitro fertilisation (years) 32.2 3.41 25-40
Height Natural conception (cm) 168.5 5.47 149-185 0.70 0.5>p>0.1
In vitro fertilisation (cm) 167.9 5.49 158-180
Gestational length Natural conception (weeks) 36.2 3.77 18-40 0.11 p>0.5
In vitro fertilisation (weeks) 36.1 3.59 16-39
Table III. Onset of labour and elective deliveries by natural or in vitro fertilisation (IVF) conception.
Natural N <%) IVF N (%) P
Spontaneous 125 (61.9) 27 (51.9) 1.71 0.5 > p > 0.1
Induction 42 (20.8) 13 (25.0) 0.43 p > 0.5
Elective Caesarean section 35 (17.3) 12 (23.1) 0.91 0.5 > p > 0.1
Table IV. Comparison of mode of delivery by natural or in vitro fertilisation (IVF) conception.
Natural N (%) IVF N (%) x? P
Spontaneous vaginal delivery 215 (64.4) 47 (58.8) 0.88 0.5>p>0.1
Forceps or vacuum extraction 27 (8.1) 14 (17.5) 6.41 0.02>p>0.01
Breech 15 (4.5) 5 (6.2) 3.17 0.1>p>0.05
Emergency Caesarean section 77 (23.0) 14 (17.5) 1.16 0.5>p>0.1