Triplets and quadruplets in Switzerland: comparison with singletons, and evolution over the last decade.
OBJECTIVE
Main objectives were 1) to determine the incidence of higher multiple births from 1995 to 1998 in Switzerland, and 2) to evaluate neonatal mortality and morbidity. Secondary objectives were 3) to compare the results with those of matched singletons, and 4) to compare the present data to the first Swiss study (1985-1988).


METHODS
Retrospective analysis of maternal and neonatal data obtained from all Swiss hospitals.


RESULTS
The incidence of triplet births was 1/3247 and that of quadruplet births 1/81,186. The median gestational age was 32 5/7 weeks for triplets, and 28 6/7 weeks for quadruplets. The median birth weight was 1665 g for triplets and 1076 g for quadruplets. Perinatal mortality was 6% for triplets and 19% for quadruplets. Respiratory distress syndrome was the major morbidity as diagnosed in 52% of triplets and 81% of quadruplets. A comparison of triplets with matched singletons showed no significant differences in morbidity and mortality. Compared with the first Swiss study, the mortality rate decreased, while the incidence of triplets increased but decreased for quadruplets.


CONCLUSIONS
The incidence of higher-order multiple births in Switzerland dropped for quadruplets in the last decade but has increased for triplets. The mortality and morbidity of triplets is comparable to that of singletons with a similar gestational age.
Arlettaz
Romaine
R
Neonatal Unit, University Hospital, Zurich, Switzerland. Romaine.Arlettaz@fhk.usz.ch
Paraskevopoulos
Elena
E
Bucher
Hans-Ulrich
HU
D002585:Cesarean Section; D005260:Female; D005307:Fertilization in Vitro; D005865:Gestational Age; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D010062:Ovulation Induction; D011247:Pregnancy; D011272:Pregnancy, Multiple / Q000706:statistics & numerical data*; D011783:Quadruplets; D012127:Respiratory Distress Syndrome, Newborn / Q000453:epidemiology; D020554:Sperm Injections, Intracytoplasmic; D013557:Switzerland; D014310:Triplets