The Twinning Rates and Epidemiological Characteristics of Births in Southeast Uttar Pradesh, India

Abstract

Birth statistics over a period of 5 years were analyzed to study epidemiological characteristics of twinning in Southeast Uttar Pradesh, India. The data revealed higher incidence of breech twins (11.84% of all cotwins) as compared to breech single births (2.18%). But the perinatal mortality and caesarean section rates were similar in both twin and singleton pregnancies. The cumulative twinning rate over the studied period was 11.70 per 1000 live births. The MZ and DZ twinning rates were estimated respectively as 3.67 and 8.03 per mill. The mean maternal age of sampled mothers was 26.42 years with one standard deviation of 5.30 years. The twinning rate for mothers over 35 years of age was about four times higher than that in mothers younger than 20 years. Incidently, the twinning rate was the highest at parity four and a non-linear curve could more appropriately be fitted to the series of data. Seasonal variations were observed for both twin and singleton births. The highest frequency of births was observed from August through October. But seasonal index for twinning rate showed a clear bimodal distribution with peaks in April (223) and September (167).

Prevalence and Heritability of Early Childhood Caries Among Monozygotic and Dizygotic Twins

“…There were a total of 18 reliable questions with which the physical similarity quotient (PSQ) was calculated. The prevalence rate of MZ and DZ twins in this study was 1:3, which is in accordance with previously published literature (Sharma, 1997). Carroll et al (2005) reported an MZ-to-DZ ratio of 1:2.…”

Impact of SARS‐CoV‐2 on multiple gestation pregnancy

“…The present study reported a higher incidence of twinning (34%) as compared with other studies from north and south India [7,8]. This is due to the fact that the study hospital was the only dedicated Covid-19 hospital providing maternity care for pregnant women with Covid-19 in Mumbai, and thus received all referral cases from Mumbai city and the nearby regions.…”

“…as compared with other studies from north and south India. 7,8 This is due to the fact that the study hospital was the only dedicated COVID-19 hospital providing maternity care for pregnant women with COVID-19 in Mumbai, and thus received all referral cases from Mumbai city and the nearby regions. In addition, the majority of women with MGP in the present study conceived through assisted reproductive technology, resulting in a higher twinning rate.…”

Monthly trend and seasonal variation in twinning rate in Japan, 1975-1994

“…No significant variation was reported in Brazil, 1984(Krieger et al 1996), in Greece, 1980-1985(Kataki and Kouvatsi 1988), or in Iran, 1975-1983(Farhud et al 1986). Meanwhile, positive seasonality of twinning was reported in Turkey (higher rates in May-August) (Duyar and Guntay-Ayaz 1993), in Bangladesh (both for DZ and MZ twins) (Razzaque et al 1990), and in India (Sharma 1997). In Denmark, a fifth-order polynomial curve with peaks in twin birth rates in May-June and December, along with troughs in February and September, was indicated for a series of data between 1977 and 1984 (Bonnelykke et al 1987).…”