1988
DOI: 10.1017/s0001566000004037
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Demographic Parameters and Twinning: A Study in Catalonia, Spain

Abstract: Twinning rates for the years 1975-79 in Catalonia (Spain) are presented. Crude rates are very low: 7.62 per 1,000 maternities, the DZTR and the MZTR being 3.74 and 3.88 respectively. Standardized rates remain very low. Sex ratio among twin couples is also very low (0.49 male vs 0.51 female births). A multiple linear stepwise regression on the twinning rates shows MZ rates to be influenced by birth order and father's age, and the DZ rates by mother's age and birth order.

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Cited by 4 publications
(2 citation statements)
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“…Several authors have concluded that twin births show a lower SR than singletons [2,4,7,9,13,17,22,23], but some others could not confirm this tendency [18,21]. The present paper aims to compare the annual variation of the SR in twin births at two maternity hospitals from southeastern Brazil with that observed in a control group of singletons, and to speculate about some interpretations of the variability of this ratio.…”
Section: Introductionmentioning
confidence: 90%
“…Several authors have concluded that twin births show a lower SR than singletons [2,4,7,9,13,17,22,23], but some others could not confirm this tendency [18,21]. The present paper aims to compare the annual variation of the SR in twin births at two maternity hospitals from southeastern Brazil with that observed in a control group of singletons, and to speculate about some interpretations of the variability of this ratio.…”
Section: Introductionmentioning
confidence: 90%
“…Using micro-data provided by the Spanish National Statistics Institute (INE) Fuster et al (2006;2008) considered the variation of rates and the factors involved in the present rise of double and triple deliveries in Spain in association with the use of subfertility treatments. Other recent studies are limited to specific regions or small rural areas (Bertranpetit and Marín, 1988;Hernández et al, 2004).…”
Section: Abstract: Twins Triplets Regional-temporal Analysismentioning
confidence: 99%